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AK2-SC 255 Reference Manual (April 2005-LU)

1. O4 09 7003 ee ee 11 20 15 AM Confiqure Back C Alarms Suction SD Meat C SD Meat C lh SD Meat C le Compressors Icream Ex C 2 I Meat C 3a I Heat C 3b A C Condenser Other Bitzer Select the first circuit on the list above It turns out to be typical for circuits controlled directly by the SC 255 Initially the alarm screen looks as at left below O4 foo 7003 11 26 14 AM Temp 29 6 F Ed Ft 05 1 Temp 29 6 F Ed Ft 05 1 Low Temperature Low Temperature If below 50 0 F for 15 min High Temperature Disabled High Temperature Disabled Eey switch override Mo Notice that the name of the circuit appears in the heading of the screen Then there is an area where the current sensor temperature appears along with the number of the I O board and point to which the case temperature sensor is wired At first you see two alarms both disabled In the screen at right above we have enabled one of the alarms by changing its level to Normal We have changed the default settings 50 and 30 min to more reasonable settings for the fixture Enabling the alarm also caused the appearance further down the screen of a question about a Key switch override The following screens show the second alarm configured and the key switch override AK2 SC 255 Reference Manual RS 8D M1 22 Configuring AKC 164 alarms RS 8D M1 22 answer has been changed to Yes Temp 259 6 F Ed Pt 05 1 Temp 29 6 F E
2. 0 to 4 The number of compressor unloader stages 1 field per unloader 0 99 The percent of capacity shed by the respective unloader List box Type of variable speed control None No inverter control VO An inverter is controlled by an analog output variable output VLT A Danfoss VLT adjustable frequency drive is used 1 0 to 150 0 The minimum percentage of rated speed at which the inverter will run the compressor 1 0 to 150 0 The maximum percentage of rated speed at which the inverter will run the compressor 1 to 9999 The RPM that will be displayed at maxi mum percentage 0 to 10 The number of resets after which the inverter will be put in override 0 99 The number of seconds without proof that must elapse before an inverter reset occurs 0 to 99 The number of seconds that must elapse before second and subsequent inverter resets AK2 SC 255 Reference Manual 21 22 Configuring other compressors in the suction group Compressor oil and safety information Danfesi Paging down you will find a page for each compressor in the suction group These subsequent screens will have only questions pertaining to the individual compressors not the rack questions found at the top of the screen for compressor number one After basic operating data has been entered for all compressors paging down will produce this screen Hil eont rol 2 sos oe fres Type of oil monitor TSensor Input Lockout comp
3. 750 0 F Cutin setpoint 7120 0 F Cutout setpoint 745 0 F Cutout setpoint 7110 0 F Stage 2 Cutin setpoint 750 0 F Cutout setpoint 745 0 F Stage 3 Cutin setpoint 750 0 F Cutout setpoint 745 0 F Minimum OM time 7 O min Minimum ON time T2422 min Minimum OFF time 7 O min Minimum OFF time 7255 min The fields are as follows Number of valves 0 to 2 The number of valves used for subcooling Number of stages 1 to 3 With one valve there can be only 1 stage of subcooling With two valves there can be two stages one valve open or two If there are two valves feeding subcoolers of different capacities then there can be three stages only valve 1 open only valve 2 open or both valves open Cutin setpoint 0 0 to 120 0 each stage has a separate setpoint The temperature at which the subcooling stage will become active Temperature is measured by a sensor at the liquid outlet of the subcooler Cutout setpoint 0 0 to 110 0 each stage has a separate setpoint The temperature at which the subcooling stage will shut down Minimum ON time 0 to 255 The minimum time in minutes each stage must remain active after being cut in Minimum OFF time 0 to 255 The minimum time in minutes each stage must remain off after being cut out If there is not a distributed controller at the fixture AKC 161 AKC 164 Degree Maste
4. Don t skip when DP above AK2 SC 255 Reference Manual 0 to 12 The number of defrosts each day 1 to 180 The number of minutes after which defrost will terminate if termination has not occurred on a setting configured in the previous screen Often called fail safe defrost time time of day one field for each of the number of defrosts configured in the first line of the screen The time each defrost will initiate List box Yes No When Yes is selected The SC 255 has the ability to determine based on analysis of current and accumulated data to determine if each defrost is needed When a defrost is not needed it is not initiated thus reducing energy cost and enhancing product life 1 to 255 Minimum number of hours between de frosts List box Yes No Whether or not to override defrost skipping on a dewpoint setting next question 1 0 to 3276 0 Defrost will occur regardless of skipping calculations whenever dewpoint is above this setting RS 8D M1 22 Shutdown schedules Configuring evaporator alarms RS 8D M1 22 Devt Dual Temp control List box Yes No A Yes answer allows the circuit to be used in two temperature ranges and creates a digital input for changeover of temperature range Alt target Range 50 0 to 150 0 1 0 to 20 0 The second temperature and range for a dual temperature evaporator Dual Temp relay needed List box Yes No Alt target Range 50 0 to 150 0 1 0 to 20 0
5. Name Compr Pm EXFAN Bd Pe 04 7 Beast Wo On N Open Control Input Ca Ol OT Hinimum OFF minutes Pre delay O minutes Hininmum ON minutes Post delay minutes Completing that working example hopefully increased your comfort with calculated points Now we will go through each of the fields and functions in order Here is the heading area of the calculated points screen Units OI Unda Style Generic Beda We ve discussed the Units field and its contents earlier The contents specify the type of point being created whether an OI or SI The 13 kinds of SI are differentiated by the units in which their values are presented There is one special selection you can make from the Units list box lt Delete gt Use this button in the style box to delete the calculated point Higher numbered points will remain in place The deleted point will be the next new point made available for configuration To understand the various styles of Calculated SI and OI points we will give use the initial framework screens that display when each combination of Units and Style is selected We will present them by style lt Clear gt This button clears the configuration for the selection of a new style Generic OI SI The style we used for the example just completed Clone OI SI Offers a means of cloning any physical board amp point to be used elsewhere in the system Schedule OI only Used to create an O
6. Other controllers AKC 16x EKC Degree Master and DCU case controllers VLT drives and Bitzer compressor interface LO 10 2002 wlll le PI Meee Board Points Belay Outputs Nane Beast Ed Pt On Fan Inv Reset A Wo oo O W Closed Fan Inv Bpass A No oo 0 W Closed Louvers Cond 4A Wo oo 0 W Closed Fan Furd Bun 4 Wo oo O W Closed Cond Fill Vly A Wo oo O W Closed Surge Valve A Mo 00 W Closed Cond Dump Vlw A No oo o W Closed Cond Fan Al Wo 00 0 W Closed SORT On PG DH for more ARR g 15 characters any The name of the load connected to the digital output relay output The default names for the outputs automatically added during configura tion of refrigeration are shown and will suffice in many applications They can be edited character by charac ter put the cursor on the field press to enter edit mode then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that space When the name appears as you want it press ENTER List box No The value of the point will not be broadcast to be used in logic on other controllers Send The value of the point whether it is ON or OFF will be available on the host network for use by other controllers Be sure that each sending Board Point combination is unique throughout the system If the controller at address 01 is sending from its Bd Pt address 1 02 then no other controller can have an o
7. RTC alarms The following are alarms that appear uniquely for RTC systems which also have alarms similar to those just presented Zone hum fail A digital alarm that can be enabled to occur when a zone humidity sensor failure is detected by the RTC for a time period specified in the alarm 1 9999 seconds min utes or hours Zone temp fail A digital alarm that can be enabled to occur when a zone temperature sensor failure is detected by the RTC for a time period specified in the alarm 1 9999 seconds min utes or hours Supply temp fail Similar to the preceding alarm Sensor discard if control based on two or more zone sensors Occurs at the specified time after one of the controlling sensors fails and the control ler logic stops using the value of that sensor The time setting can be from 1 to 9999 seconds minutes or hours NOTE if all zone sensors fail control will be based on the return air sensor Power failure A digital alarm that can be enabled to occur whenever power is restored after being interrupted the specified time period is 0 9999 seconds minutes or hours Filter elapsed Occurs when the set number from 1 to 9999 seconds minutes or hours have elapsed Useful when set for the system air filter life as a reminder to change the filter Filter runtime Occurs when the set number from 1 to 9999 seconds minutes or hours have elapsed Usually used Useful when set for the system air filter life as a reminder to chang
8. SIl gos z Compr Bm Temp 0 0 F Mum 90 0 F 20 0 F SI gt eS Compr Fm Leak 0 Oppm Mumi 100 0 600 0 i false On Current Value On Now go to the result column on the line with the word True open the list box select lt Insert gt and press ENTER to add a line for the second statement then add the condition for the leak detector When you are finished the screen will look like this L1 f12 2002 11 0502 CFG 04 21 12 PH Hl Configure Ca Ol OT Units DI ndo Cancel Style Generic Name bata Definition SIl Jos z Compr Pm Temp 0 0 F Manz 90 0 F 90_ 0 F Sls poS L Compr Bm Leak 0 Oppm Wumdty 500 0 s00 0 result Value SIL WNumez f On false SIS umg _Jf On false True off off Current Value off The last statement effectively reads IF True Off This may seem strange at first but remember that the controller is evaluating line by line There must be one true state ment called the else statement by logicians So the last line always states True with the result set to whatever state we want when none of the other conditions is true To summarize the conditions read If SII is greater than or equal to Num2 turn on the OI If SI3 is greater than or equal to Num4 turn on the OI Under any other conditions leave the fan off Another way to state the effect of this logic is If compressor room temperature is equal to or greater than 90 or refrigerant is sense
9. AK2 SC 255 Reference Manual REFRIGERATION AND AIR CONDITIONING AK2 SC 255 Rack Controller System Reference Manual RS 8D M1 22 AK2 SC 255 Reference Manua AK2 SC 255 Reference Manual RS 8D M1 22 AK2 SC 255 Rack Controller System Reference Manual What this manual covers Other manuals for this system DISCLAIMER This manual covers configuration and operation of the Danfoss AK2 SC 255 Rack Controller and systems based upon it In this manual we very often refer to the controller as SC 255 a shortened version of its official name This manual is intended for the user who requires detailed information about any aspect of the controller s operation and software Although the manual does not at this time have an index the Table of Contents that follows this page is quite extensive and should be a useful guide to the text Other Danfoss manuals that you should have are the On Site Guide for the AK2 SC 255 which covers installation and start up of the controller and the AK2 I O Module manual which details installation and operation of the I O modules and their software interface using the AK2 SC 255 and earlier controllers If you can you should check the Danfoss web site at www acr danfoss com and select the menu item for product literature The AK2 SC 255 literature will be in the Supermarket electronics section Where this manual discusses control and monitoring of equipment not manufactured by Danfoss or disc
10. Date MM DD YY Time 24 HOUR Schedule 1 Standard From 12 00 AM Days SMTWEFA To 12 00 AM Holidays 1234567 Schedule 2 Not Used Schedule 42 Not Used RES DN for more EAREEEG The fields in the screen are these Name The name associated with the phone number Names are optional but it is a good idea to give each location a name for reference in other screens Number The number itself including any dialing prefixes required by the line being used This is the number you would dial on this line using a telephone instrument to reach the destination Up to twenty characters can be entered The following special characters have the effects indicated W WAIT FOR SECOND DIAL TONE This character is useful when the phone line for the AKCESS system is connected through a PBX system WAIT FOR QUIET Before transmitting the alarm the SC 255 will wait for the receiving modem to be idle and the line quiet comma PAUSE Use the comma when the dialout telephone line goes through a switch board or PBX which makes it necessary to wait momentarily after dialing a prefix for an outside line dial tone Multiple commas can be used for longer waits Delay The delay from 0 99 minutes imposed by the RS 8D M1 22 AK2 SC 255 Reference Manual 185 186 Devt AKC 55 between dialouts to this number Default is 10 minutes This value should not be set to less than 3 minutes except by a service technicia
11. RS 8D M1 22 Num of aux heat stages Setpoint Range Ambient temp lockout No heat above Range Minimum run time Delay between stages Night setback Night setback offset Override switch Override duration Num of schedules Devt For example if the target is 68 and the range is 2 the stage will come on at 66 and will not be turned off until the temperature reaches 70 0 to 4 The number of auxiliary heat stages in the SC4 unit 0 0 to 100 0 The desired temperature at the control ling sensor when auxiliary heat is being used 0 0 to 9 9 The range selected creates a dead band For example if the target is 68 and the range is 2 the stage will come on at 66 and will not be turned off until the temperature reaches 70 List box Yes No Whether or not there is to be a lockout based on low ambient temperature 0 0 to 100 0 The ambient temperature above which heating will be locked out 0 0 to 9 9 The range for the lockout Heating will be locked out at lockout plus range and when locked out will be allowed on at lockout minus range 0 to 20 The number of minutes that a stage must run before being turned off O to 20 The number of minutes that must elapse after a stage is turned on before the next stage can be turned on List box Yes No Whether or not the heating setpoints are to be raised by an offset next line during the times when cooling is not scheduled to be on according to a
12. Whether the drop leg temperature will be monitored A Yes answer here will create an analog input sensor input for the drop leg temperature sensor List box Target The condenser fans will be controlled to maintain a target pressure or dropleg temperature depending on which strategy is selected by the answer to the Control sensor question above Cutin Cutout The condenser will be controlled by cut in and cut out based on target pressure or satu rated condensing temperature depending on which Strategy is selected by the answer to the Control sensor question above If Cutin Cutout is selected the next page will provide for selection of cut in and cut out setpoints The page is not shown here but is straightforward Please read about all of the possible answers List box Ramp together Where there is variable speed fan motor control all fans will be brought on in stages at minimum speed then ramped up in speed as a group Ramp stages Where there is variable speed fan motor control each stage will be brought on and ramped up to maximum speed When additional capacity is required fans will be reduced to minimum speed and an additional stage brought on then all will be ramped up together and so on RS 8D M1 22 AK2 SC 255 Reference Manual 43 Ramp stages if ambient Danfesi Neutral Zone Danfoss Neutral Zone control will be used This is a strategy that operates to move current value closer to target more rapidly
13. for more is the SORT field By default sort mode is on and entries will be sorted by Bd Pt address if sort mode is turned off points will be listed from then on in the order in which they were created The sorting occurs when you press EXIT and will be apparent the next time you enter the screen RS 8D M1 22 AK2 SC 255 Reference Manual 55 Board amp Points Variable outputs Analog outputs A Variable Outputs Name Ed Fft Pange Fan Inverter A g SORT On Havas Name Label field any 15 characters The name of the load being driven by the variable output The default names for the variable outputs automatically added during configuration of refrigeration are shown and will suffice in many applications They can be edited character by character put the cursor on the field press to enter edit mode then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that space When the name appears as you want it press ENTER Bd Pt Enter the Bd Pt address to which the load is wired Range List box two variable output ranges are available depending on the drive requirements 0 10 Volts 0 5 Volts SORT At the bottom of the body of the screen above the icons on the same line as PG DN for more is the SORT field By default sort mode is on and entries will be sorted by Bd Pt address if sort mode is turned off points will be liste
14. zone 4 O None Control Alarm 1 None Alarm None Alarm 3 None Alarm 4 0 None PG DN for more TEF al Zone temp group 0 to 99 The group to which this ClimaTECH unit belongs for zone temperature Several ClimaTECH units in a network can be controlled by a single sensor wired to one of them If this feature is not used leave group number set to Q Inside dewpt group 0 to 99 The group to which this ClimaTECH unit belongs for 106 AK2 SC 255 Reference Manual RS 8D M1 22 ClimaTECH on off input configuration RS 8D M1 22 Humidity sensor Humidity sensor Point Type Function dewpoint Devt Several ClimaTECH units in a network can use a single sensor wired to one of them If this feature is not used leave group number set to 0 0 0 to 150 0 The heat reclaim setpoint during store closed hours as configured in the Store Info screen List box RH DP Whether a relative humidity or dewpoint sensor is used The sensor wired to each point If the sensor is not used leave the Point field set to O List box The type of input None TP2 TP1 OI The input is an on off input 0 10 Volts This type can be used for any sensor whose output is linear from 0 10 Volts List box Control Monitor For zone sensors only whether the point is being used for control or purely for monitoring Conftiqure CT ETU 5 I O Points i On Off Inputs Point Type Fail Airflow T Mone Phase Lo
15. 0 to 8 The number of schedules that will be created below and on following pages if needed for air RS 8D M1 22 AK2 SC 255 Reference Manual 75 RTU Alarms configuration RTU Board amp Points configuration AHU Configuration AHU fan configuration 76 Donfsi damper operation Alarms can be for any of the following in accordance with the Appendix on alarms High zone temp for each configured zone Low zone temp for each configured zone High humidity for each configured RH sensor High supply temp for each configured supply air sensor HVAC fan down for each fan speed HVAC phase loss for this unit s phase loss detector HVAC smoke for this unit s smoke detector HVAC fire for this unit s fire detector See the Appendix on Board amp Points When you press the lt Setup gt button for an AHU unit the menu that appears looks like this Hl Configure Main AHU Air Damper i Cooling Alarms Ra Heating E Board Points H Dehumidi fy Only the fan and outside air coil configuration for AHU s is different from configura tion for RTUs that was spresented in the previous section There are two pages for AHU fan configuration AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 10 16 2002 a z i Configure Main AHU Fan eaction Tame oo eee 2 is Algorithm Intervwal 710 Inverter nax resets 3 Inverter reset delay 300 sec Inverter proof delay 15 sec Fost SL a naa T Z w
16. Appears only if Auto defrost schedules is enabled 0 to 20 The number of electric defrosts that can be underway concurrently Include dripdown time Appears only if Auto defrost schedules is enabled List box Yes No Answering Yes will cause a drip down period to follow defrost before refrigeration is allowed The length of the drip down period will be that specified by the user when defrost schedules are auto configured Type List box for each individual evaporator the type of evaporator control AK2 SC 255 SUBC A subcooler controlled as an SC 255 circuit AK2 SC 255 The circuit is controlled by the SC 255 s algorithms AKC 16x Control is at the fixture by AKC 161 or AKC 164 Smart Case Controllers EKC Control is at the fixture by EKC 201 control lers Deg Master Control is at the fixture by Hill PHOE NIX Degree Master controllers DCU Control is at the fixture by DCU case control lers Case lights button In the lower left corner of the screen body is a button CASE LIGHTS Selecting this button and pressing ENTER will open the configuration screen for a case lights 26 AK2 SC 255 Reference Manual RS 8D M1 22 Devt override switch The screen at left below appears with the list box closed when the CASE LIGHTS button is activated The fields on the screen and their meanings are as follows Type of override switch List box Disabled There is no override switch configured On Off A two position
17. By default sort mode is on and entries will be sorted by Bd Pt address if sort mode is turned off points will be listed from then on in the order in which they were created The sorting occurs when you press EXIT and will be apparent the next time you enter the screen Board amp Points On off inputs Digital inputs ieee Board amp Points i tmfOfrt Inputs Name Beast EBd Pt On Phase Loss A No g Heat Reclaim 41 No 00 0 SORT On er ER Name Label field any 15 characters The name of the load sensed by the digital input on off input The default names for the inputs automatically added during configuration of refrigeration are shown and will suffice in many applications They can be edited character by character put the cursor on the field press to change to edit mode then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that space When the name appears as you want it 54 AK2 SC 255 Reference Manual RS 8D M1 22 Devt press ENTER Beast List box No The value of the point will not be broadcast to be used in logic on other controllers Send The value of the point whether it is ON or OFF will be available on the host network for use by other controllers Be sure that each sending Board Point combination is unique throughout the system If the controller at address 01 is sending from its Bd Pt address 1 02
18. CFG i T CFE Configure Ca Ol OL Units OI Units OI ndo Style Generic Style Generic Pata Definition Data Definition SIl gJos z Compr Pm Temp o o F SIl gos z2 Compr Pm Temp Munz 90 0 F 90 0 F Mumz 90 0 F SIs gos 1 Compr Bm Leak O Oppm SIs gos l Compr Bm Leak Mum df 500 0 600 0 Mum df 500 0 Me Value i Errori 7 On Current Value Orn These are all mathematical operators appropriate to sensor inputs We will select gt as the operator for this statement Having done that move one field to the right and select Num2 as the argument to complete the statement The complete statement appears in the screen at right above the statement is SI1 gt Num2 The list box is open in the Result column because if the statement is true we want the OI which in turn controls the RO for the EXFAN to be On and the default result as seen in the screen at left above is Off Now we change the result to On and the entire line effectively says If SM gt Num2 Ca 01 OD will be On The controller s logic processor will stop at the first true statement and produce whatever result is in that statement s result column The screen with the first line complete in the rules area looks like this RS 8D M1 22 AK2 SC 255 Reference Manual 149 150 L1 f12 2002 11 0502 CFG 04 09 10 PH il Configure Ca Ol OT Units DI ndo Cancel Style Generic Data Definition
19. Ff 2003 12 18 01 PH Ff 2003 12 20 03 PH ni ni Addr i sc Alarms AEC 16x Controls 37 Addr Name Value FiAlarms Case Type 4EC l 4 Temp 53 0 F EFEegalator Status MNormal Operation 34 Prod Box D 4 34 1 F T 35 Bakery Bu D 5 33 2 F T 36 Fish Box D 6 34 4 F 0 Number of alarms fi 37 Re N 3 0 F oO 38 Meat Box D amp 230 8 F T 39 Dairy Bax D 9 34_5 F Oo 40 Mb Dairy D 10a 32 7 F T 41 Mb Dairy D 10b 34 7 F T 42 Mb Dairy D 10c 33 1 F T 43 Mb Dairy D lla 33 5 F T 44 Mb Dairy D 11b 33 2 F T 45 Mb Dairy D lle 33 4 F T SOET n PG DN for more EEEE a Number of alarms field In the first screen above you can see by the highlight that we have already moved the cursor to the sensor we want to configure an alarm for With the cursor there when we press ENTER the screen at right above appears The cursor is by default on the Number of alarms field We can enter any number from 0 to 3 We want to configure only one alarm Entering 1 in the Number of alarms field produces the screen at left below Case Type AKC 164 Temp 53_ 0 F Case Type AKC 164 Temp 53 0 F Beq ulatoar Status Normal Operation Regulator Status Normal Operation Number of alarms 1 Nubisabledalarms 1 libisabled Before proceeding we must change the action level of the alarm from Disabled to one of the other levels In the example at right above we re changing the level to Normal 1 7 Miscellaneous Points Configuration W
20. during store closed hours according to a schedule or sched ules in the Store Info screens 0 0 to 100 0 The amount by which the dehumidifica tion setpoint set on previous page is to be raised during store closed hours according to a schedule or schedules in the Store Info screens You will use one of two pages depending on whether economizer control is used lo 1ls 2002 HS Configure ETU ha ip gale anpe oe AE Control smethod oo eee Ambient temp lockout Wo air damper helow Use COZ override 7 2 2s Target COZ Amount Damper Controlled by Air Damper Control method AK2 SC 255 Reference Manual Air Damper Yes Yes 35 0 F Yes 1000 ppm Belay Output Configure BTU sIr Danner a ee T Control method 7 Control economizer on _ Humidity sensor to use 7 Enthalpy differential 04 00 18 PP Air Damper Yes Economizer Enthalpy Average 0 0 ETUrlb Use C02 override 222 3 Yes Target COZ Amount 1000 ppm Damper Controlled by Variable Out Min Damper Position Toro 0C s Max Damper Positiorn 7 100 0 4 Variable Qutput range 7 0 10 Volts eaction line C ses es 7 B Algorithm Intervral 7 10 Eii List box Yes No Whether or not there is a con trolled air damper List box Fan ON The damper will be open whenever the fan 87 88 Ambient temp lockout No air damper below Control economizer
21. output If a variable speed fan is configured an analog gas valve cannot be and vice versa 40 0 to 150 0 the difference between supply air temperature and zone temperature 0 to 100 The minimum percentage of valve opening when auxiliary heat is on 0 to 99 The number of seconds after the enabling relay turns on before the analog valve can open E Configare CT ETU 5 Wum of st gesS io oon TU Occupied setpoint o o F Unoccupied setpoint 0 0 F Lockout below ambient o 0 F Delay between stages 7 1 min Aux heat dehumid lockout No Num of stages Occupied setpoint Unoccupied setpoint Lockout below ambient Delay between stages Aux heat dehumid lockout 0 to 6 The number of dehumidification stages 40 0 to 150 0 The dehumidification setpoint during operating hours as configured in the Store Info screen 40 0 to 150 0 The dehumidification setpoint during store closed hours as configured in the Store Info screen 40 0 to 150 0 The outside ambient temperature below which dehumidification will be locked out 0 to 99 The number of minutes after the start of a dehumidification stage that must elapse before the next stage can start Also the minimum time each stage must run before being turned off List field Yes No Whether or not auxiliary heat is to be locked out when dehumidification is running A yes RS 8D M1 22 AK2 SC 255 Reference Manual 103 ClimaTECH
22. schedule page Num of schedules 0 to 8 The number of night setback schedules desired on the following schedule page s RTU Air Damper configuration For air damper configuration select Air Damper from the Configure RTU menu 7 ls gel Bury a ae tp eee en T Yes Ambient temp lockout 7 Yes Wo air damper bhelow 7 45 0 F Reha Ue eb ot ee any eee eR 4 0 F Num of schedules 3 z Sched L Erpe 2 eee oe ae Standard Sched 1 se see t 12 00 AM Sched l TCine tott n nan t 12 00 Am Sched Vile dew s 5 a ee SMTWRFA Sched 1 holidays lz 345678 Sched lt Erpe aaan ee Standard Schediz te dene orno cr ae tT 12 00 4M Sched 2 Cine oft 227 2 2 ace tT 12 00 4M Sched 2 td ys o oat ee SMTWUEFA Sched 2 hola days aos 222 t 1lz 345678 Air Damper List box Yes No Whether or not there is a con trolled air damper Ambient temp lockout List box Yes No Whether or not the air damper is to be locked out based on ambient temperatuare No air damper below 0 0 to 100 0 The air damper will be locked out below this temperature minus range next line The air damper will be allowed to open again again when ambient temperature has risen to lockout plus range Range 0 0 to 9 9 The range selected creates a dead band around the lockout temperature The air damper will be locked out at lockout temperature minus range and once locked out will be allowed to open at ambient lockout plus range Num of schedules
23. shut if the outside temperature is above this setting 99 9 to 99 9 In enthalpy control when outside enthalpy is less than inside enthalpy by this differential the damper will be allowed to open List box Yes No Whether or not damper control is to be overriden based on CO2 content of inside air 0 to 2000 When CO2 override is enabled the CO2 level at which the damper is allowed open to bring in fresh air List box Variable Out The damper is modulated by the RTCs analog output variable output Relay Output The damper is opened by a digital output relay output 0 0 to 100 0 When a variable out is controlling the minimum percentage of damper opening allowed 0 0 to 100 0 When a variable out is controlling the maximum percentage of damper opening allowed List box When a variable out is controlling the AK2 SC 255 Reference Manual RS 8D M1 22 Devt minimum percentage of damper opening allowed 0 5 Volts Sets the RTC board s analog output for an output over the range 0 5 volts 0 10 Volts Sets the RTC board s analog output for an output over the range 0 10 volts Reaction Time 1 to 99 This setting together with the next deter mines the sensitivity of variable output control It should be adjusted only by a Danfoss trained techni cian Algorithm Interval 1 to 15 This setting together with the previous one determines the sensitivity of variable output control It should be adjusted onl
24. 0 to 200 0 Range 1 0 TO 10 0 To begin configuring compressors select Compressors from the Configure Rack menu The first page of the screen looks like this AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 No of compressars ofl Co pressor type e s THeciprocating Proof type o oaa gy ae meee ae TBitzer Reset Bitzer with BO Noa Compressor l size lt 20 0 No swt unloaders 2 2223 T4 Unloader capacity 1 z0 2 20 3 Z0 4 20 Inverter Bonet rol c26 22 5 TYO Inverter min speed 7 50 0 Inverter wax speed 7100 0 BPM at max speed Tlood Inverter Wax resets 7 3 Inverter proof delay 10 sec Hin time between resets t30 sec PG DM for more No of compressors Proof type Reset Bitzer with RO Compressor size No of unloaders Unloader capacity Inverter control Inverter min speed Inverter max speed RPM at max speed Inverter max resets Inverter proof delay Min time between resets The fields and their contents are as follows 0 to 9 List box The means by which proof of compressor operation is monitored None No proof OI A digital input on off input is used for proof CT A current transformer is used for proof Bitzer Proof is obtained from a Bitzer electronic module List box Yes No Whether or not Bitzer compres sors are reset by a digital output relay output 1 to 500 The capacity of the compressor
25. 50 0 psi for S0min Low Pressure High Pressure Suction Pres C 06 1 Low Pressure Suction Pres C 06 1 Normal below 3 0 psi for Biin High Pressure Suction Pres C 06 1 Disabled Disabled Low Temperature Suction Temp C d6 5 Low Temperature Suction Temp C 06 5 Disabled Disabled PG DN for more PG DN for more The screen at left above shows the default alarm pressure and time settings that appear as soon as the alarm action level is changed to something other than disabled In the screen at right above we have moved cursor first to the pressure setting where we changed the pressure to 3 0 psi from 50 0 and then to the time setting where we raised the time to 30 minutes The low pressure alarm will now occur whenever the suction pressure sensor for rack C reads below 3 0 psi for 30 minutes Since it is set for an action of Normal the alarm will dial out only once The timer will reset to 0 any time the pressure rises above 3 0 psi only after the timer has reset in this manner can the alarm occur again AK2 SC 255 Reference Manual RS 8D M1 22 Field limits and units for analog alarms Disabling What alarms are needed Frequently Asked Questions RS 8D M1 22 Devt The numeric value field for an alarm based on an analog sensor for instance pres sure temperature humidity and light level will accept values from 999 9 to 999 9 The units which are selected in the Store Info configuration screen for Units Lan g
26. 9999 seconds minutes or hours If the rack has Bitzer compressors with electronic interface and the AKC 55 is configured to control the compressors there will be a menu selection for Bitzer alarms All special Bitzer alarms are embedded in the Bitzer compressor electronics After selecting Bitzer from the rack alarms menu it it is then necessary to select the individual compressor We have omitted the screen that lists the compressors from the illustrations below The alarm types are shown below the screen illustrations AK2 SC 255 Reference Manual RS 8D M1 22 HVAC alarm configuration RS 8D M1 22 a ee ee ee A Suction P Compressors Circuits Condenser Dirty oil filter Motor overload Oil flow Oil level Discharge temp Phase fail Botation fail Bun proof fail Disabled The setpoints for the embedded Bitzer alarms are fixed in the compressor electronics and are only monitored for occurrence by the SC 255 The alarms are virtually self explanatory For further information consult literature supplied by the compressor manufacturer The navigational route to HVAC alarm configuration is as follows from the Main Menu select Configuration then Alarms then HVAC The alarm configuration menu is shown at left below When you select HVAC from the alarm configuration menu a list menu headed Configure HVAC Alarms will appear It will list every HVAC unit that you have configured Such a list screen appears at ri
27. AA 02m Suction Pres AB 02m Disch Press A 02m Disc Temp O20 Subcool Tip AAL D 2IL Subcool Tip AAS RES DN for more Om Just above the icon menu bar at the bottom of the screen are three buttons View Auto View and Clear Their functions are as follows View Auto View Clear Displays history for the datapoints shown at the top of the screen Displays history for the first five points in the body of the current screen regardless of the points selected in the upper portion of the screen The points selected in the top of the screen remain unaf fected Also see the paragraph on Auto View following the next illustration Clears the column labeled view in all the Configure History Display screens for all the points represented by the icons on the menu at the bottom of the screen No history is lost by using the Clear button Only the setup for display is cleared The point names at the top of the screen will change to Not configured Most of the time when viewing history on the SC 255 s display you ll want to select the datapoints from the various I O screens and use the View button Doing so having made the selections shown in the illustration above will result in a history display like this AK2 SC 255 Reference Manual 189 190 Rate Scroll Mode Latest or Snapshot Graph 1 I 62m 62m Suction Pres AA 2 SI 02m 02m Suction Fres AB 2 SI 02m O2Mm S8ubcool Trp AAL 4 SI 02m O2 m Subc
28. Cancel will undo all changes leaving the point as it was before you started to edit it In the Style field select Generic Move to the data definitions area of the screen and put the cursor over the first name which by default says ROI Toggle to edit mode and open the list box and the screen will look as at left below Select SI F from the list box and press ENTER AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 Now the screen looks like the one at right below 04 11 29 PH Pi Sos02 L1f1l2 2002 11 0502 CFG L1fl2 2002 CFG Configure Ca Ol Configure Ca Ol OT Units OL ndo Cancel eric Style Generic Definition Value Name Data Definition Value Wot configured Terror SE Wot configured Terror True line Value j Value Oe ee CSE Terror naif Ol es ee EE Terror On True On Se Chedule Current Value f Errori 7 On Current Value f Errori 7 On Move right to the next field and select the compressor room temperature which we called Comp Rm Temp and assigned to Bd Pt 05 2 Now the screen will appear as below O2 37 45 PH It Us02 L1fl2 2002 CFG Hl Configure Ca Ol OT Units DI ndo Cancel Style Generic Data wince ea ion Value Current Value f Errori 7 On Notice that after the selection is made the value field for the sensor changes from error to 0 0 F Still in the data definitions area select the blank in the secon
29. Deadband Dave sensor 0 to 2 The number of stages of heat reclaim in the rooftop There will be a target and delays for each stage configured 0 0 to 100 0 The target temperature for the heat reclaim stage 0 to 60 The number of minutes after target minus range is reached before the stage will be turned on 0 to 60 The number of minutes after target plus range is reached that the stage will be turned off 0 0 to 9 9 The range applied to target prior for control actions See preceding two settings List box Staging Auxiliary heat is staged None There is no auxiliary heat Analog valve Auxiliary heat is regulated by a modula ting valve List box High Speed Low Speed The fan speed for heating List box Yes No Whether or not there is to be a night setback for heat 0 0 to 50 0 The amount by which the heating setpoint set on previous page is to be lowered during times when night setback is scheduled List box Yes No Whether or not there is a night setback override switch 0 to 1439 The number of minutes after operation of the override switch that night setback will be overrid den 0 to 8 The number of night setback schedules Schedules are entered on thelast page s reached by using the PG DN key List box Yes No Whether or not heating is to be locked out above a supply air temperature to be specified on the following line 0 0 to 999 9 Above this temperature plus deadband next
30. ENTER The screen is as shown below RS 8D M1 22 AK2 SC 255 Reference Manual 47 10 10 2002 Heat tec ari n ee TYes Niu of Stages 2255524 63 T stagen l type eee ener ee Water Ht cutin Setpoint 2224 oe dames 0 eee a Cutout setpoint o a 7 140 0 F Stage s CYPE eee eae Water Ht Cuttin Set poli 2 2 oe 7 l1 0 0 F Cutouk setpoint 7 140 0 F dpa ey Kal geet eee ee eee ee rane TYes Flush Cycle Start Time 12 00 AM Flush Cycle Duration 10 min Lockout on low head prestYes Lockout Pressure 22 26 7 100 0pei Lockout on liquid level Yes Liquid level sensor typetSensor Input Heat reclaim List box Yes No Whether or not heat reclaim is present and controlled Num of stages 1 or 2 The number of stages of heat reclaim Stage 1 type List box Water Ht The stage is used for heating water HVAC The stage heats HVAC supply air On Off Input The stage is turned on or off by an on off input from the the I O network HVAC Refrig link method list box Bd Pt Network Cutin setpoint 99 0 to 200 0 The tank water temperature at which the stage will be turned on Cutout setpoint 99 0 to 200 0 The tank water temperature at which the stage will be turned off Stage 2 type The same choices as for Stage 1 type and setpoints are offered Flush Cycle List box Yes No Whether or not there is to be a flush cycle Flush Cycle Start Time Time of day The time at which the flush cycle will be init
31. Humidity sensor Dynamic offset No offset lt Full gt Ambient temp lockout No cooling below Night setback Night setback offset Minimum ON time Minimum OFF time AK2 SC 255 Reference Manual Danfesi List box Yes No Whether or not humidity will adjust the cooling target temperature List box Average Cooling target modification will be based on an average of two humidity sensors High Cooling target modification will be based on the highest of two humidity sensors Zone 1 etc each zone humidty sensor will be available as a choice in the list Cooling target modifi cation will be based on the single selected sensor 99 9 to 99 9 The number of degrees by which humidity can adjust the target temperatures Within the range of humidity limiting the offset a linear relation ship will exist between humidity and offset see also next two parameters 99 9 to 99 9 The relative humidity below which there will be no offset of target temperature 99 9 to 99 9 The relative humidity above which the maximum offset of target temperature by humidity will be applied List box Yes No Whether or not cooling is to be locked out below a set ambient temperature next line 0 0 to 100 0 The ambient temperature below which cooling will be locked out List box Yes No Whether or not the cooling setpoints are to be raised by an offset next line when the store is closed according to a schedule or sche
32. Outputs E Board Points The calculated points feature of SC 255 versions 1 00 and higher first on the menu above is arich and very powerful set of tools We will discuss it later in this section The menu items will not be taken up in the order that they appear on the menu Before beginning configuration plan your strategy What types of points will you need to define How many If you need to develop a control strategy involving several inputs outputs and schedules you may wish to look at the examples at the end of this section first because it shows how on off inputs sensor inputs schedules and even other relay outputs are used to create a custom control strategy for a relay output You can configure up to 48 miscellaneous relay outputs per SC 255 To configure a miscellaneous relay output select Relay Outputs from the Configure Miscellaneous menu When the Configure Misc Relay Outputs screen appears increase the number AK2 SC 255 Reference Manual 141 142 Miscellaneous Sensor Inputs Miscellaneous on off inputs Specifying Miscellaneous Conversions Devt of relay outputs in the first line by 1 or a higher number to match the number of outputs you want to configure Edit the name of the input then complete configura tion by making a selection for each field for each new input the enter the number of on off inputs you want to configure A step by step configuration example for a miscellaneous relay out
33. RS 8D M1 22 0 to 5 The number of zone sensors in the area of the store served by this HVAC unit List box Min Temp Control will be based on the lowest value of all temperature sensors in the unit s zone Max Temp Control will be based on the highest value of all of the temperature sensors in the unit s zone Average Control will be based on the average of all the temperature sensors in the unit s zone Zone Temp 1 1 etc each zone temperature sensor will be available as a choice in the list Control will be based on the single selected temperature sensor 0 to 6 The number of cooling stages in this HVAC unit 0 0 to 99 9 A separate field for each of the stages in the unit 0 0 to 9 9 The range selected creates a dead band For example if the target is 72 and the range is 2 the stage will come on at 74 and will not be turned off until the temperature reaches 70 0 to 60 The number of minutes that must elapse after target plus range is reached before the stage will come on There is one field for each stage 0 to 60 The number of minutes that must elapse after target range is reached before the stage will be turned off There is one field for each stage AK2 SC 255 Reference Manual 67 10 16 2002 Max suction press safety Suction Pres AA Wo cooling abowe 7 85 0pei Freeze Protection TSensor Input SECPOINE A ieee teeny ee enee 7 35 0 F Wight sethack T Yes Night
34. Rack subsystem is shown on the menu with a corresponding icon There are also menu items for system functions like Alarms There s a Rack Service item that offers special functions for maintenance technicians and a Configure Rack selec tion for adding or modifying configuration either of equipment or of control strategy Now let s look at one of these items With the cursor on Suction Groups pressing ENTER brings up a screen that lists the suction groups on the rack AK2 SC 255 Reference Manual RS 8D M1 22 11 00 46 AM Suction Groups Name Current Target Suction AA l3 lpsi l psi Suction AB 6 Spe i 7 O0psi We ve already seen the information on this screen current and target pressures in the Refrigeration menu The difference is that here we can select one of the suction groups If we press ENTER while the cursor is on Suction AA we ll see our first detailed status screen Suction A Status Maintaining Capacity Actual Target uct 13 2 l psi Ctrl Temp 0 0 F e ll ay OSF Trgt Temp 0 0 F Float z 6 pS Beference l psi Discharge 132 3 F Capacity 3 lhp Ae AE Compressar AAL 0n Inverter 2 77 04 YYO EPH Oil Pressure z O Opei BEANE eo A Notice that there is a row of icons across the bottom of the screen The cursor is on the third icon suction which is shown in reverse video From left to right the icons represent History User Screen Sucti
35. Reference Manual RS 8D M1 22 RTU Fan configuration page 2 RS 8D M1 22 1lo f1is 2002 Configure ETU Fan control Default fan Fan control Default fan Configure ETU Post se laste ee T Z win DEG CH Fan type Fan control OPEN hours Monitor phase loss TYes Which phase loss monitor Phase Loss 1 Shutdown phase loss TYes Shut domn on smoke detecttYes Shut dorman on fire alarm Yes Wo of return sensors T Controlling sensor 2 lt THeturn Air l 1 Wo of supply sensors 7 Controlling Sensor TSupply Air 1 1 for more List box 1 Speed The unit has a single speed fan 2 Speed The unit has a two speed fan List box Continuous The fan will run continuously during open hours Store open hours are defined in the Store Info screens On demand The fan will run on demand during open hours On demand means that the fan will run whenever conditions calling for heating heat reclaim cooling dehumidification or venting are met Fan control CLOSED hours List box Post delay Monitor phase loss Shutdown on phase loss Which phase loss Continuous The fan will run continuously during closed hours Store closed hours are defined in the Store Info screens On demand The fan will run on demand during closed hours On demand means that the fan will run whenever conditions calling for heating heat reclaim cooling dehumidification or venting are
36. Setup Meter 2 gt Setup Enter the number of meters to be configured and a list will appear These are the fields No of KWH Utility Meters 0 to 16 The number of meters being configured Name Label field any 11 characters Enter the name of the meter being configured Type List box The AK2 SC 255 currently supports the following energy meter models AK2 SC 255 Reference Manual 115 116 Danfesi EMON although no longer marketed by Danfoss Wattnode Wn Plus Wattnode plus Configuration of Wattnode Plus is covered in this manual on the third page follow ing this one Pulse Pulse metering via an AK2 I O module gt Setup lt button field Put the cursor here and press ENTER to begin setup When the setup button is pressed the Configure Meter menu appears as at left below When Meter Setup is selected from the menu the first page of the Meter Setup screen appears as at right 11 06 2002 i 1106 2002 Conftiqure Meter 1 i Meter Setup Meter 1 Number af CT sets ofl AIMS Rete ee ee oe TESA Voltage num phases 1LZ0 208 03 Collect History 22 2 222 TYes Use unit for demand lim Yes Window Same ce yee eee 715 win i Meter Setup Normal load OO HBS _ 1000 Normal load 01 HAS 7 1Lo00 Normal load Of HARS 7 1000 Normal load 03 HAS 7 1Looo Ea Board a Points Normal load 04 HES 1000 Normal load OS HRS 7 1Lo00 Normal load 06 HRS 7 1Lo00 Norma
37. The name of the compressor being controlled by the VLT The default names for the system s VLTs that were automatically added during configuration of refrigeration are shown and will suffice in many applications They can be edited character by character put the cursor on the field press to change to edit mode then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that space When the name appears as you want it press ENTER Locate Button field Each VLT must be located by the SC 255 Place the cursor on the Locate field and press ENTER Then when instructed by a pop up box on the SC 255 screen go to the VLT and press the service pin The SC 255 will then read the VLT address which will appear on the screen to the right of the Locate field DCU circuits Board amp Points Section to be added 62 AK2 SC 255 Reference Manual RS 8D M1 22 Devt 1 3 Configuring HVAC To begin configuring HVAC select Configuration from the Main Menu then HVAC If there are no units configured the screen looks as at left below If one or more units are already configured a menu screen will appear that lists all the units as at right below In the example one unit of each possible type has been added In practice this would be a very unlikely store To add a new unit simply put the cursor on the No of HVAC Units field and increase the number by one A new uni
38. Today zI EVO Peleas 266 0 F Yesterday O 20 Yesterday 1 Total a cre Last Start 06 30 AM Last Stop 08 50 AM PO DN for more Bee Ree oA BE OWE ESE Evaporator Settings Smart Case Control If you select the settings icon second from the left on the menu bar at the bottom of any evaporator screen an evaporator settings screen like the one at right above appears To the right in the body of the screen are fields related to defrost Terminate The termination set point Coord If Yes then defrost for all fixtures in this group 1s coordinated Drip Down The time in seconds allowed after defrost for the fixture to drain before refrigeration begins Fan Delay The time in minutes after defrost during which case RS 8D M1 22 AK2 SC 255 Reference Manual 171 Evaporator Schedules Smart Case Control Evaporator Service Smart Case Control Evaporator Service Manual Operation Smart Case Control 172 Devt fans remain off to avoid discharging humid air into the product storage area Intel Def AKV valves Indicates whether or not Intelligent Defrost is activated for this evaporator Max Skips AKV valves The maximum number of successive defrosts which can be skipped by Intelligent Defrost Max Time AKYV valves A percentage from 0 95 In Intelli gent Defrost as time for a scheduled defrost nears the Smart Case controller calculates its duration If the calculated duration is less than the
39. Using the Service Screens sssssnnnunnnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn nenna 165 167 AO M a RE S a E A A E E A A S 165 166 RCS aera ce E E A E E EE TE 166 ER Or E E E E E E A 166 Mno eE OE oa E E E E E E E E E OE TR 166 167 BOPEIOCAGONS a E E A T E E E E S EE lt lt 167 2 3 Using the Smart Case Controller Screens cccccessseceeceesseeeeecenseeeseeeeseeeseeenneees 168 174 aroda on E E E E E E E A 168 171 Papnor or e e E A E A EA E 171 172 PDO Ora EO E S ontwecsasaceasoan taeda assaueastan Scomtneasautancsuteeneaasause 172 PoP OE SONOS a E A E E EE EE 172 174 IVP ATA A OVC Oiee E E 172 173 AEC WOK SUC esc cerse sas E E ceva econ neon ene E E E E E 173 CaS Cle AI e E 173 174 2 4 Using the Refrigeration Screens for Refrigeration Circuits cccccsesseseeeeeeeneees 174 175 Eyapordtor SS SE otc tet ce es secede ste ute noe gant alee tu cokacoasunecoue ebaceesentants ate wicoeeaneoee tec 174 175 VAP OE ALOE Se US SiC i osae sacs stavosasuacia 175 Evaporator Schedules screen Evaporator Alarms screen and Evaporator Service screen 0006 175 2 5 Using the COMMUNICATIONS SCIeeENS ccccceeeeeeeeeeenseeeseeenseeeeeoenseeseeeesseeeseoeseeees 176 187 TOSI TNC YF E soot tse ced E E E AA EE ET 176 VO INCE OK Status SCTCOI i oacsrce cise ent enoaan eaae r e e ESES 176 177 ASCO E E E E E cca EE E E E E 177 179 MUSE INOS A E E N A E AA E AA E E E A E T 179 18
40. a dewpoint calculated from zone temperatuare and humidity Both zone temperature and humidity sensors must be installed List box if controlled by dewpoint or humidity only and if there are multiple sensors Average Control will be based on the average of a group of sensors High The high value of a group of sensors will be used RS 8D M1 22 RTC Air Damper configuration RS 8D M1 22 Target Target differential Pre delay for stage Post delay for stage Cooling low limit Night setback Night setback offset Devt Zone 1 etc Any single humidity sensor or combina tion of sensors will be used 0 0 to 100 0 The humidity or dewpoint value desired at the controlling sensor or combination specified above 0 1 to 15 0 The differential forms a deadband above and below the target in which no control actions are taken Dehumidification will be turned on at target plus differential and turned off at target minus differential 0 to 60 The number of minutes that must elapse after target plus range is reached before the stage will come on There is one field for each stage 0 to 60 The number of minutes that must elapse after target minus range is reached before the stage will be turned off There is one field for each stage 0 0 to 100 0 The temperature at and below which dehumidification is disallowed List box Yes No Whether or not the dehumidifica tion target is to be raised by an offset next line
41. appear as at right below As you configure questions may appear that are not included on the default screen The screen at left below shows all the possible lines revealed 2 29 BA suction ASA a sucio ballad nse oad oe ee 7h Suction Pale Carget cc senn da ee oe 2 O 0pesi PSIG Safety cutout a O 0pesi Monitor suction temp Yes Adaptive suction control ARF SC255 Display superheat temp Mo Pd Pte aonet ue oo 6 eee eres 700 0 Temp Per gets ag osecec eee 7 0 0 F Monitor desuperheat temp No Range f 6 eee ce ade ers 7 20 F Maximum pressure float 4 0 psi Close ARV valves Post defrost delay 720 min during rack shutdown 7 Tes Allow float below target Ho Only when suction is abore Hight S tbdthscceveceuas Ty target B 26 ees 5 0 psi Pressure differential 2 0psi Delay tite soer ee T 45 sec Setback from time 212 00 AM Rack on ARC 55 address Setback to time 912 00 AM oetback CaP See ce emcee TSHTWRPA Setback holidays P1223 45 675 PG DW Eor more The fields and their contents are as follows Suction I D 2 label fields the first is a list box A to Z the second is 9 characters not constrained This is the identifica tion you wish to assign to the suction group The entry will modify the screen title For example if you enter a B in the first field and Low Temp in the second the right portion of the screen title for the configuration and status screens
42. be monitored Which phase loss monitor List box Select from any of the configured phase loss monitors Shutdown phase loss List box Yes No Whether or not the fan is to be shut down on detection of a phase loss Shutdown on smoke detect List box Yes No Whether or not the unit is to be shut down when its smoke detector is on Shutdown on fire alarm List box Yes No Whether or not the unit is to be shut down when a fire alarm monitor detects a fire AK2 SC 255 Reference Manual RS 8D M1 22 SC4 cooling configuration alarm 10 15 2002 Lise So AM Ei Configure 54 Unit 4 Cooling i Munber af zone sensors 73 Controlling sensor 2 Tao0one Temp 4 1 Wum of cooling staqes Four Set ag ele ac deme eae oe eas eer eee 7 74 0 F S a ale alee ne ere eek ee one ee er Oe Ambient temp lockout Yes No cooling below 7 40 0 F Parra ey abet te ee Soran ep teat meee Oia Minimum run time TZ min Delay between Stagqges 73 min Night setback eoe TYes Night setback offset 7 5 0 F Override sulteh 2 2 55 fres Owerride duratiorn T60 min Mum of schedules L PG DN for more No of zone sensors Controlling sensor Num of cooling stages Setpoint Range 0 to 5 The number of zone temperature sensors List box Min Temp Control will be based on the lowest value of all of the zone temperature sensors Max Temp Control will be based on the highest value of all of
43. ber that there can be only 45 HVAC units per SC 255 After addressing place the cursor on the Locate field and press ENTER A message will appear asking you to press the service pin on the ClimaTECH controller Go to the controller and depress the service pin After completing the Locate procedure place the cursor on the Init field and press ENTER If the ClimaTECH controller is configured with a handheld remote control the configuration data is stored locally It is not stored in the SC 255 until uploaded This is accomplished by placing the cursor on the Upload field and pressing ENTER Night setback List box Yes No Whether or not the cooling setpoints are to be raised by an offset next line during the times when cooling is not scheduled to be on according to a schedule or schedules next page Night setback offset 50 0 to 50 0 The amount by which the cooling setpoint is to be raised during night setback Override switch List box Yes No Whether or not there is an over ride switch wired to a digital input Override duration 0 to 1439 The number of minutes that control will be AK2 SC 255 Reference Manual RS 8D M1 22 Devt overridden after operation of the override switch Num of schedules 0 to 8 The number of operating schedules entered on the following page s Config List box No Rec No The sensor is not used Rec A sensor value is received from the system s I O network AK2 SC 255 Bd Pt Enter th
44. default settings and should only changed by a Danfoss trained technician 0 to 10 The number of reset attempts when proof is not detected before the variable speed drive will be placed in override 0 to 600 The number of seconds that must elapse between resets 0 to 600 The number of seconds that must elapse after proof is not detected before a reset attempt List box Yes No Whether or not phase loss will be monitored List box Yes No Whether or not the unit is to be shut down when its phase loss detector input is on RS 8D M1 22 Devt Shutdown on smoke detect List box Yes No Whether or not the unit is to be Shutdown on fire alarm RTC Cooling configuration shut down when its smoke detector is on List box Yes No Whether or not the unit is to be shut down when a monitored fire alarm occurs Select Cooling from the configuration menu for an HVAC unit of type RTC lo fis z002 Ji Configure ETU TEPE T AM Cooling i Wum of cooling stages T Z Control cooling using Beturn Air Target differential TAIA E Target temp for stage l 74 0 F 2 74 0 F Fre delay for stage l 1 min 2 1 min Fost delay for stage 1 1 min 2 1 min Humidity adjusts target Yes Humidity Sensor 2 2224 so T Average Dynamic aoffset o o F No offset 45 0 full gt 55 0 Ambient temp lockouwut 7 Yes No cooling below 7 40 0 F Wight sethack AE
45. demand during hours when the store is not open whenever heating cooling dehumidification or venting is called for 0 to 60 The number of minutes the fan will run after the last stage of heating cooling dehumidification or venting is turned off 40 0 to 150 0 When heating is on fan speed will be ramped up when LAT leaving air temperature is greater than this setpoint 40 0 to 70 0 When cooling is on fan speed will be ramped up when LAT leaving air temperature is less than this setpoint 30 0 to 60 0 When dehumidification is on fan speed will be ramped up when LAT leaving air temperature AK2 SC 255 Reference Manual 77 78 Second page AHU Fan Configuration Speed Inverter Heating Cooling Dehumidification Heat Reclaim in Dehum Rpm at max speed Reaction Time Algorithm Interval Inverter max resets Inverter reset delay Inverter proof delay Monitor phase loss Shutdown on phase loss Shutdown on smoke detect Shutdown on fire alarm Devt is less than this setpoint Min 0 0 to 70 0 Max 50 0 to 130 0 The highest and lowest percent of rated maximum speed last line on the screen that the inverter will be allowed to drive the fan motor Min 10 0 to 100 0 Max 50 0 to 130 0 The highest and lowest percent of rated maximum speed last line on the screen that the inverter will be allowed to drive the fan motor when heating is on Min 10 0 to 100 0 Max 50 0 to 130 0 Th
46. during the access The audit trail log shows every system access whether from an SC 255 keypad from a local terminal or from a remote location via modem Whenever someone gains entry to an AK2 SC 255 system the system keeps a record of the date and time of entry the point of entry and the authorization level and account code used Up to 4000 entries are stored with the number reduced when languages additional to English are selected Each change in settings is documented Points of entry that can appear are keypad local and remote Local means that a user has connected a PC such as a laptop to one of the SC 255 s on the host network and gained access to the system Remote means that access has been via modem communications A summary of the audit trail is shown in the authorization screen To view details move the cursor to the Audit Trail box and press ENTER The next screen shows the record of a number of actions AK2 SC 255 Reference Manual RS 8D M1 22 10 40 28 Audit Trail 00028 09 20 01 10 40 Keypad 3 5 00027 09720701 10 42 Keypad 1 1 Authorization Configuration Audit Trail English Tes Espahol No Yes 00026 09 20 01 10 22 Keypad 1 1 Authorization Configuration Level Auth Account SEE O ee ee 4 HVAC All te WAH The actions are serially numbered and listed in reverse chronological order here from 00028 back to 00026 The entries you will see in your system will no
47. field heating will be shut down 0 0 to 50 0 The number of degrees above the lockout setting where heating will be shut down Also the number of degrees below the lockout setpoint where heating will be allowed after being locked out AK2 SC 255 Reference Manual RS 8D M1 22 HS Configure ETU 1 TEPEE T EEN Heating Ra Wum of aux heat stagqges 7 Z Target temp for stage 1 69 0 F 2 69 0 F Fre delay for stage 1 min 2 0 min Fost delay for stage 1 min 2 0 min Lockout aux ht in setbk Yes 4mbient heat lockout 7 No heat abore 7 Y0 0 F Finge dTi ENE E NS 2 OSF FG DN for more Num of aux heat stages Target temp for stage Range Pre delay for stage Post delay for stage Lockout aux ht in setbk Ambient heat lockout No heat above Range RTU Heating auxiliary heat configuration p2 analog valve strategy RS 8D M1 22 0 to 5 The number of auxiliary heating stages in this HVAC unit 0 0 to 99 9 A separate field for each of the stages in the unit 0 0 to 9 9 The range selected creates a dead band Heat will cut in at target minus range and cut out at target plus range 0 to 60 The number of minutes that must elapse after target plus range is reached before the stage will come on There is one field for each stage 0 to 60 The number of minutes that must elapse after target minus range is reached before the stage will be tur
48. fixed speed or variable speed l rlSrz 0z Far S Loti D Hs REE ae MN APE 7 Variable VO Ser aa eta foe he 7 Continuous Variable Speed Fan Stage Syst ein Setpoint Range Graal balk ls prowess oem eer 7 060 cooling meee eed cetera ne 0 0 F 0 0 F Dehumidification oO Dehumidi fication o 0 F o 0 F Heat reclai abe ee 7 0 Heating no aA 0 0 F o o F Auxillary Heat 7 E Hin fan Speed feos heb 7 680 Heat Dehumid fan speed 50 Shut dorman on fire alarm Yes Shutdown on fire alarm tYes Monitor phase loss TMo Monitor phase loss TYes Which phase loss monitor Mot configured Shutdown phase loss T Fan type List box Fixed Speed Variable VO Fans can be single or 2 speed fixed or variable speed Clima TECH controllers have only one analog variable output If you select variable speed here you will not be able to control an analog gas valve if any as a modulating valve Airflow control List box 100 AK2 SC 255 Reference Manual RS 8D M1 22 Devt Continuous The fan will run continuously On Demand The fan will run only when cooling heating or dehumidification is called for High Speed Fan Assignment Fixed speed fans may be 2 speed Enter in the Stage field for cooling dehumidification heat reclaim and auxiliary heat the stage at which you want fan operation to change to high speed Variable Speed Fan A setpoint and range are configured for cooli
49. fixture normally in response to load conditions Cut out AKV valves Fixture temperature is below target range minimum The valve percentage will hold at zero closed The evaporator will remain in this status until fixture temperature rises to target when the status will change to Start up Start up AKV valves The evaporator enters this status following any state when the valve has been closed including Cut out Defrost Low superheat and any manual shutdown During Start up the valve opens a predetermined percentage for a maximum of 2 minutes to establish minimum superheat a minimum positive temperature differential between evaporator inlet and outlet When minimum superheat is reached the status will change to Cut in Cut in AKV valves This status always follows Start up it 168 AK2 SC 255 Reference Manual RS 8D M1 22 Devt also exists whenever the evaporator is refrigerating and the fixture temperature is more than 5 5 F above target range maximum In Cut in status the valve will be regulated to search for and maintain the minimum stable super heat which for the current load conditions will become the target superheat The Smart Case Controller continually adapts its superheat target to changes in load on the evaporator so that refrigerant flow is adjusted accordingly When target fixture temperature is achieved the evaporator status will change to Normal operation or Area control Area Control A
50. from 0 to 5 because a single AK2 SC 255 can control up to 5 suction AK2 SC 255 Reference Manual RS 8D M1 22 Devt groups Note that in the case of this particular field entering a O zero will pop up a warning box letting you know that a zero response here will eliminate the suction groups already configured and will delete all information stored for the rack you will be asked to confirm the entry Selecting from list boxes Configuring Rack Info RS 8D M1 22 The next pair of illustrations shows how the controller uses list boxes l1 r lrz z f Configure Pack A Fack Info P ck trane nanne a et 2 Stage Syste n oan Fack L be l oaee a a 2 stage system 7 Wo of suction groups 7 FPeftrig ag 2 eee et eee ee Wo of suction groups 7 Fetrig type eee ere ese Monitor phase loss fe Generate input for each yR4015 Shutdown phase loss 7 Generate input for each Shutdown phase loss 7 The list box appears as shown at left above when you move the cursor to the field and then press the key or at your PC right click Then using the UP and DOWN arrow keys you can move the cursor to make a selection In the example at right R404A has been chosen The cursor actually stayed in the same position but the window moved When you have put the list box s cursor on the selection you want press ENTER to save your Selection Some list boxes contain only tw
51. from 2 minutes to 1 day There are two modes Latest and Snapshot in which history data can be displayed applying to both the columnar display as seen in the example above and to graphing In Latest mode the display shows the most recent history ending with the value of the most recent sample the display is updated as each new sample is recorded constantly moving forward In Snapshot mode you can display any stored history for the selected points from the oldest data to the present The Graph button will present a graph of the displayed data If the display is in Latest mode the graph will plot as each new sample is collected A typical graph screen looks like this one AK2 SC 255 Reference Manual RS 8D M1 22 Realtime Scale Time Sam Rate Realtime Snapshot RS 8D M1 22 a ead cece Old MST O2m O2m Suction Pres AA ES2I o2m O2m Suction Fres AB mS 82m OFM Bubcool Timp AAL Sl Of OFM Bubcool Timp AAS Best o2m 02m Suction Temp AA Al I The STAT funct ion is covered int he sect ion following GRAPH Od O06 99 Darda 00A Co O4 O06 99 10 12 004 Rate O01 Min Min 30 Max 100 Sam 30 AAS O Text Snapshot When viewing graphs with AKA 65 software on a PC with a color monitor the graph traces will be in color and their colors will match the key given at the left side of the upper portion of the screen Due to the mode of reproduction used for this manual not all the color traces are visibl
52. function as a stand alone it contains its own schedules They are set for each day and holiday in the same manner as lighting schedules Refer to the lighting schedule section for information on setting If all schedules are set to Relative and the default zero settings are left for all schedules then the HVAC unit will operate based on the store open hours set in the Store Info screens ClimaTECH I O configuration A ClimaTECH unit s points must be allocated and assigned using the I O points screens RS 8D M1 22 AK2 SC 255 Reference Manual 105 ClimaTECH relay outputs lofis 2zo002 Configure CT ETU 5 I O Points Belay Outputs Stage Name La Ga A Be oe Fan D Economizer E Cooling o Dehumidi ty o Heat Reclaim o oO ux Heat o oO Hang PSS O A ClimaTECH 65 can have up to six analog sensor inputs up to six digital on off inputs and up to five relay outputs For a ClimaTECH 1024 these capacities are increased to 10 10 and 24 respectively It is the purpose of the I O Points screens to allocate these An input or output number from 1 up to the limit of the controller is entered under the stage number in the case of relay outputs ClimaTECH sensor inputs f Configure CT ETU 5 Ifo Points iJ Sensor Inputs zone temp group TO Inside dewpt group 7 1 Humidity sensor 3 DP Point Type Function zone l None Control zone oO None Control zone 3 oO None Control
53. installed if this answer is given or the configuration should be changed No The sensor is not configured Its value can not be used by the controller Rec The sensor value is to be received from another node other than this RTC board on the I O network The board and point that is broadcasting the value must be given in the next column Address field If the sensor value is received from another node on the I O network enter here the address of the point that is to be received Here is the screen for on off digital inputs reached with the third icon from left Note that the screen is divided in two parts the upper half deals with inputs available on the RTC board and the lower half shows inputs that can be received from other nodes on the I O network The names appear whether or not the points are config ured or used Configure ETU I O Points i On Off Inputs ETC Inputs AEC 55 Ft Name Config On Bd Pt l Fan Yes Yoltagqe 2 Cool 1 Mo Toltage ao Co l z Mo Toltage 4 Smoke Det Rec o Voltage pan AEC 55 Inputs Nane Ecast Or Bd Pt Override Rec Yoltagqe 00 0 Smoke Stat 3 Mo Wo Voltage OO O Phase Loss 3 Rec Yoltagqe 00 0 TERE E First the RTC Inputs Pt Name Config 1 to 8 The number of the point Label field not changeable The name of the point The names are fixed since the hardware points on the RTC board are dedicated and can serve only for the listed devices The names al
54. left below RS 8D M1 22 AK2 SC 255 Reference Manual 151 L1fl2 2002 11 0107 CFG Pesos AT L1 f1l2 2002 LSU Water Pump Az Meee Pear ub pubs Conftiqure Hise Oil Fail 4l Oil Fail Aa z Oil Fail AAS Oil Fail Aad Oil Fail Aas Name aba eee Mame Dual Temp AAZ Ba Pu 04 7 Ba PC Box Door Ass Beast Mo Beast Phase Loss B On N Open On Fire Stat Burglar Alarm Fire Alarm Control Input 00 0 Wot configured Control Input BER Minimum OFF OF minutes Minimum OFF OF minutes Pre delay O minutes Pre delay O minutes Minimum OW OF minutes Minimum OW minutes Post delay O minutes Post delay O minutes It is not necessary to change anything in the top half of this screen which repeats the configuration we entered on the previous page though we could change it here if we wanted There are two things to add to configuration here Control Input List box all configured OIs Our new calculated OI is found at the bottom of the list Use the three dots at the top or bottom to move up or down the list a page at a time The other fields on the screen are timers To keep the exhaust fan from cycling too rapidly when the temperature is hovering near the setpoint we will set a 10 minute post delay The finished screen looks like this 152 AK2 SC 255 Reference Manual RS 8D M1 22 The heading fields Units Style RS 8D M1 22 L1 f1l2 2002 11 0107 CFG 10 46 25 AI mie Lelay Outputs
55. met 0 to 60 The number of minutes that the fan will run after the last stage of heating cooling etc is turned off List box Yes No Whether or not a phase loss monitor will be monitored List box Yes No Whether or not the unit is to be shut down when its phase loss detector input is on List box All available phase loss monitors are shown Shutdown on smoke detect List box Yes No Whether or not the unit is to be Shutdown on fire alarm shut down when its smoke detector is on List box Yes No Whether or not the unit is to be shut down when a monitored fire alarm is detected AK2 SC 255 Reference Manual 65 No of return sensors Controlling sensor No of supply sensors Controlling sensor Lockout on proof failure RTU cooling Donfsi 0 to 5 The number return air temperature sensors List box Min Temp Display will be based on the lowest value of all of the return air temperature sensors if there are more than one Max Temp Display will be based on the highest value of all of the return air temperature sensors if there are more than one Average Display will be based on the average of all the return air sensors if there are more than one Return Air 1 1 etc each return air temperature sensor will be available as a choice in the list Display will be based on the single selected sensor 0 to 5 The number supply air temperature sensors List box Min Temp Display will be ba
56. minutes nit address of AEC55 with Modem 0 Alarm Box 1 4 IF Network 4 Alarm Box 2 0 Printer 0 Alarm Box 3 0 You can change the interval at which critical alarms are sent by placing the cursor over the number and entering a new interval from 10 to 99 Make sure that the address entries for Modem IP Network Printer and each Alarm Box are correct For alarm boxes the SC 255 where the alarm box is installed must have a relay output board and point assigned for the box To receive alarms a serial printer can be connected to one of the AKC 55 s in the host network The printer is attached to the RS232 port To configure the port for the local printer from the Main Menu select Communica tions Printer The Printer Settings screen will appear Baud Autea Delay 5 min Date lt HMM SDDSYyY Time 1z2 Hour Lang English Send alarms when cleared Mo Schedule 1 Schedule Wot Used Schedule 3 Wot Used Bag E E Sa AK2 SC 255 Reference Manual RS 8D M1 22 Devt Fields in this screen are as follows Baud Delay Schedules If you dont ent er a schedule for t he print er NOTHING will print The transmission speed 300 28800 from the AKC 55 to the printer Should be set at the speed of the printer s serial port as given for the printer in the printer user documentation The minimum time from 1 to 10 minutes between alarm transmissions Alarms will only print
57. not the unit is to be shut down when its phase loss detector input is on List box Yes No Whether or not the unit is to be shut down when its smoke detector is on List box Yes No Whether or not the unit is to be shut down when a monitored fire alarm occurs AK2 SC 255 Reference Manual RS 8D M1 22 No of return sensors Controlling sensor No of supply sensors Controlling sensor AHU outside air coil configuration Devt 0 to 5 The number of return air temperature sensors List box Min Temp Control will be based on the lowest value of all of the return air temperature sensors Max Temp Control will be based on the highest value of all of the return air temperature sensors Average Control will be based on the average of all the return air sensors Return Air 1 1 etc each return air temperature sensor will be available as a choice in the list Control will be based on the single selected sensor 0 to 5 The number of supply air temperature sen SOTS List box Min Temp Control will be based on the lowest value of all of the supply air temperature sensors Max Temp Control will be based on the highest value of all of the supply air temperature sensors Average Control will be based on the average of all the supply air sensors Supply Air 1 1 etc each supply air temperature sensor will be available as a choice in the list Control will be based on the single selected sensor When outside a
58. of the demand period used when calculating a 118 AK2 SC 255 Reference Manual RS 8D M1 22 About soft starts Configuring demand limiting HVAC demand limiting RS 8D M1 22 Devt rolling demand using a sliding window The effect of a soft start is to slowly add load to the generator after it starts If for instance soft start begin level is set to 6 when the generator starts only refrigeration loads and loads assigned level 7 through 11 will be on After one minute if the load is below the start shedding at percentage of maximum emergency load level 6 will be turned on After another minute the same decision will be made for level 5 and so on down to level one If at any time the load reaches the start shedding at percentage load shedding will begin again until the system reaches the start restoring at per centage One utility meter per AKC 55 will allow configuration for demand limiting Configur ing demand limiting strategy is a two step process First you select the meter to be used for demand limiting and enter the parameters then select the loads to be shed for limiting demand and give each a priority In order to use demand limiting you must have a Danfoss approved utility meter with Echelon interface and if you are going to establish both normal and emergency load limits you must wire and configure an on off input for the automatic transfer switch In addition if the site has a couplin
59. on Humidity sensor to use Lockout if outside above Enthalpy differential Use CO2 override Target CO2 amount Damper Controlled by Min Damper Position Max Damper Position Variable Output range Dave is on Economizer Economizer control will be used based on either humidity or enthalpy Schedule The air damper will be operated according to a schedule or schedules entered on the next page CO2 Ctrl The air damper will be operated based on the CO2 level in the HVAC unit s zone appears when any control method except economizer is used List box Yes No Whether or not the air damper is to be locked out based on ambient tempera ture appears when any control method except economizer is used and question above is answered Yes 0 0 to 100 0 The air damper will be locked out below this temperature List box appears only if economizer control is selected Humidity The air damper will be controlled based on humidity Enthalpy The air damper will be controlled based on calculated enthalpy List box Average Enthalpy or humidity control will be based on the average of two zone humidity sensors High Enthalpy or humidity control will be based on the highest of two humidity sensors Zone 1 etc each zone humidty sensor will be available as a choice in the list Enthalpy or humidity control will be based on the single selected humidity Sensor 0 0 to 100 0 The air damper will be locked out
60. on the EKC EKC ad dresses are set using the buttons on the EKC The installer should provide a list with the address for each fixture If such information is not available obtain the address at the fixture from the EKC by using the buttons Init Init button field Use in accordance with the following explanation of network re scan and initialization Network Re scan and Initialization After the EKCs have been configured and addressed you need to re scan the network so that they are recognized then initialize them You must perform the following steps 1 From the Main Menu select Communications From the Communications Menu select I O Network 3 From the I O Network Menu select Re scan Re scanning the network can take several minutes After the re secan return via the Main Menu to the EKC Board amp Points Configuration Screen and 4 Put the cursor on the Init field and press ENTER RS 8D M1 22 AK2 SC 255 Reference Manual 59 Danfesi Upload Button field Placing the cursor on this field and pressing ENTER will cause information programmed at the fixture on the EKC to be uploaded to the AKC 55 controller Wink EKC Wink Button field Placing the cursor on this field and pressing ENTER will cause this individual EKC to blink its display for a short time so that its fixture can be identified Degree Master Board amp Points After Degree Master controllers have been configured and addressed in accordance with th
61. override switch allows the lights to be switched on or off On Auto Choices are ON or automatic operation Off Auto Choices are OFF or automatic operation On Auto Off All three choices are available with a three position switch being installed Depending upon configuration and the equipment present dewpoint for anti sweat control can be read from a dewpoint sensor or it can be calculated using the values of relative humidity and temperature sen SOTS l o Trant fir i eh Back Configuration Rack Configuratior Case Lights Override Type of override switch M Revert to auto with timer Yes Timeout after 60 minutes Case Lights Override Type of override switch Name Beast Ed Pe On Case Lights OW Wo 00 0 Toltage Configuring AK2 SC 255 subcooling circuits When subcooler valves are controlled directly by the SC 255 that is when an AKC RS 8D M1 22 AK2 SC 255 Reference Manual 27 28 Configuring AK2 SC 255 refrigeration circuits Devt 165 Subcooling Controller is not used configuration begins by selecting AK2 SC 255 SUBC in the Type column for the circuit on the Evaporator Menu then moving the cursor to the word Setup for that evaporator and pressing ENTER A screen like the one at left below will appear The same screen with all its fields revealed appears as at right Wumber of walves om Mumber of walwes dz Mumber of staqes T3 Stage l Stage l Cuttin Setpoint
62. psig AKS 32 500 Danfoss pressure sensor O to 500 psig PHOTO OD 1 Danfoss indoor outdoor photocell with type AKS 21 temperataure sensor PHOTO ID Danfoss indoor photocell PT1000 Danfoss temperature sensor DPS100 Danfoss dew point sensor ECI TP 1 ECI temperature sensor type TP 1 ECI TP 2 ECI temperature sensor type TP 2 NOVAR Novar temperature sensor THERM3 Danfoss THERM3 low and medium range temperature sensor THERM3 HT Danfoss high range THERM3 temperature sensor EMHS3 Danfoss humidity sensor indoor with temperature sensor EMHS4 Danfoss humidity sensor outdoor 1 6 Volts A user supplied linear response sensor with 1 to 6 Volt output 0 5 Volts A user supplied linear response sensor with 0 to 5 Volt output 1 2 Volts A user supplied linear response sensor with 1 to 2 Volt output CTTS Com Trol temperature sensor RS 8D M1 22 AK2 SC 255 Reference Manual 53 Danfesi CPC501 1121 CPC type 501 1121 temperature sensor Elm Elm temperature sensor HGM CHAN Provides channel information for a multi zone Yokogawa leak detector HGM LEAK Provides refrigerant ppm for the channel given by HGM CHAN 10A CT Danfoss 10A current transformer 150A CT Danfoss 150A current transformer 200A CT Danfoss 200A current transformer Percent Any 1 to 10 Vdc sensor readout O to 100 Leak Danfoss leak sensor SORT At the bottom of the body of the screen above the icons on the same line as PG DN for more is the SORT field
63. select Configuration then Refrigeration and the Rack Configuration screen appears At the bottom left of the screen are the words gt gt Add Rack lt lt Move the cursor there and press ENTER A new Rack Info screen will appear mA Suctions Z Compressars 2 circuits 2 0 Condensers 0 Beech label 2 2 22s eee TI 2 stage SySCen G earn THNo Wo of suction groups 70 Fettrigotipe n ee ee TREE Gl aa ite ye eee ee ee ee eye T Monitor phase loss TYes Generate input for each Pack Shutdown phase loss TYes gt gt Add Back Notice that the Rack Label field contains the letter B by default since the previously configured rack was rack A You can change the default label if you want To configure a suction group press MENU to return to the Main Menu then select Configuration then Refrigeration The Rack Configuration screen appears as at left above Select the rack and a Configure Rack menu appears as at left below AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 Oe 2002 09 41 32 AMI oz F002 3 42 50 AM Confiqure Pack amp Configure Rack Rack Info E Receiver A Suction AA Suction Info Heat Reclaim A Suction AE E Board amp Points P CoupressorsS my Alarms Evaporators M Condensers Once at suction configuration menu shown at right above select the suction group you want to configure and press ENTER The Suction Info screen for that group will
64. space to space and the up and down arrow keys to select the character for that space When the name appears as you want it press RS 8D M1 22 AK2 SC 255 Reference Manual 63 Danfesi ENTER Type for each individual listed HVAC unit List box Note a section explaining configuration of each of the following types follows this section in the order in which the types are given here RTU The unit is a packaged rooftop unit AHU The unit is a built up system with an air han dling unit RTC The unit is controlled by a Danfoss RTC board SC4 The unit is a Seasons 4 Smart Coil packaged rooftop system CT 65 The unit is controlled by a Danfoss or ECI ClimaTECH 65 controller CT 1024 The unit is controlled by a Danfoss or ECI ClimaTECH 1024 controller Carrier The HVAC unit is a Carrier Centurion or Carrier Premier Link lt Setup gt Button field Used to enter the configuration screens for the individual HVAC units You must ensuire that you have selected the appropriate entry in the Type column first RTU Configuration When you press the lt Setup gt button for an RTU unit the menu that appears looks like this l rlSsrz z 01 53 06 PH f Configure ETU 1 Air Damper i Cooling Alarms Ra Heating E Board Points R Dehumidi fy From this menu you can enter the configuration screens for each of the components of the HVAC unit RTU fan configuration There are two pages for fan configuration 64 AK2 SC 255
65. the SC 255 zones just discussed except that the question Number of control relays is replaced with Number of control points These panels also require board and point setup and initialization see below AK2 SC 255 Reference Manual 113 Powerlink and Cutler Hammer board amp point configuration Locate procedure Donfsi Starting at the lighting configuration menu select Board amp Points press ENTER and when the Board amp Points Relay Outputs configuration screen appears select the rightmost icon at the bottom of the screen and press ENTER A menu will appear like the one in the left illustration below 11 06 2002 Bee Board amp Points Light Panel Cutler Hammer 1 Powerlink 1 Locate Setup oO Breaker 1 50 Sales Cutler Hammer l Setup 1 Breaker 2 50 Sales Breaker 3 50 Sales Breaker f4 50 Sales Breaker 5 Breaker 6 Wot Config Breaker 7 Wot Config Breaker 8 Wot Config Breaker 9 Wot Config Breaker 10 Wot Config Breaker 11 Not Config Breaker 12 Not Config Breaker 13 Mot Config i i lh E Breaker 14 Mot Config PG DM for more Place the cursor on the Setup field and pres ENTER and the setup screen will appear as at right above For each breaker there is a list box with the names of the zone names that can be assigned to that breaker Select the appropriate zone name for each configured breaker and setup is complete Powerlink panels require that you put the cursor on the Locate
66. the language used on the screens the units used for pressure and temperature and the date and time format These settings will be for the local PC only and will not affect the display at the SC 255 s in the system To change the displayed units or to select a language for the screens choose Store Information from the main menu then choose Units Languages You will be presented with the Units Languages screen which looks like this n302 05 Units Languages Pressure p amp i Temperature F Date ah Time 12 Hour Language English Light Level percentage The fields in the screen are these The selections are self explanatory Pressure List box psi bar Temperature List box F C Date List box a choice of 4 date formats Time List box choose either 12 or 24 hour format Language List box English Espa ol Portugues Deutsch Chinese Japanese Light Level List box percentage footcandles 2 1 Navigation and Making Changes RS 8D M1 22 No matter what type of system you are working with whether refrigeration HVAC or lighting moving around the screens and menus in an SC 255 is the same We will use a Series of refrigeration menus and screens as examples in this section but the same principles will apply to any other part of an installation On the Main Menu notice that one of the menu items is in reverse video that instead of the text being dark on white backgr
67. the zone temperature sensors Average Control will be based on the average of all the zone temperature sensors Zone Temp 4 1 etc each zone temperature sensor will be available as a choice in the list Control will be based on the single selected sensor List box None Four Of the four cooling stages in the unit the number to be controlled by the AKC 55 Either all units are controlled or none are controlled 0 0 to 100 0 The desired temperature at the control ling sensor 9 9 to 9 9 The range selected creates a dead band For example if the target is 72 and the range is 2 the stage will come on at 74 and will not be turned off RS 8D M1 22 AK2 SC 255 Reference Manual 95 Ambient temp lockout No cooling below Range Minimum run time Delay between stages SC4 heating configuration Donfsi until the temperature reaches 70 List box Yes No Whether or not there is to be a lockout based on low ambient temperature 0 0 to 100 0 The ambient temperature below which cooling will be locked out 0 0 to 9 9 The range for the lockout Cooling will be locked out at lockout minus range and when locked out will be allowed on at lockout plus range 0 to 20 The number of minutes that a stage must run before being turned off 0 to 20 The number of minutes that must elapse after a stage is turned on before the next stage can be turned on No of zone sensors Controlling sensor Num of ht rclm st
68. this setpoint Min 0 0 to 70 0 Max 50 0 to 130 0 The highest and lowest percent of rated maximum speed that the inverter will be allowed to drive the fan motor Min 10 0 to 100 0 Max 50 0 to 130 0 The highest and lowest percent of rated maximum speed that the inverter will be allowed to drive the fan motor when heating is on Min 10 0 to 100 0 Max 50 0 to 130 0 The highest and lowest percent of rated maximum speed that the inverter will be allowed to drive the fan motor when cooling is on Min 10 0 to 100 0 Max 50 0 to 130 0 The highest and lowest percent of rated maximum speed that the inverter will be allowed to drive the fan motor when dehumidification is on 0 0 to 20 0 The increment in percent by which variable speed is increased when called for by an increase in load 0 0 to 20 0 The decrement in percent by which variable speed is decreased when called for by an decrease in load List box 0 5 Volts Sets the RTC board s analog output for a variable speed drive requiring 0 5 volts 0 10 Volts Sets the RTC board s analog output for a variable speed drive requiring 0 10 volts 1 to 20 This setting together with the next regulates the sensitivity of speed control These should be left at the default settings and should only changed by a Danfoss trained technician 1 to 15 This setting together with the preceding one regulate the sensitivity of speed control These should be left at the
69. to enter an initializa tion string The initialization string is a sequence of characters which set up the modem Consult the modem manual for the proper commands If the modem was supplied by Danfoss instructions will accompany it or you may call Danfoss Technical Support for assistance Enter the transmission speed in baud or bits per second for the modem being configured If the telephone line being used is touch tone use Tone If the line is only for dial telephones use Pulse Default is Tone A setting used in error checking Possible settings are odd even and none Default is none The number of data bits 7 or 8 in each transmited or received byte Default is 8 The number of stop bits 1 or 2 in each transmit ted or received byte Default is 1 The address of the AKC 55 which is equipped with a modem and which is to be used for communica tions The means by which the telephone connec tion will be broken by the modem Choices are AT Commands and Power Down Default is Power Down AK2 SC 255 Reference Manual RS 8D M1 22 Devt Phone Numbers The Phone Numbers screen can contain up to 5 phone numbers for alarm dialout locations Each number has its own screen page which you travel to using the PG DN key To reach the Phone Numbers screen select Phone Numbers from the Communications menu Od 49 20 FMI Mame Dantoss Mntrng Baud AUTO Number L200xeN2b 63 Type Printer Delay 10 min Init AT
70. 0 P IN Gy Oi EEE an E E 180 181 Alamroutmne TOT EEMO 24 ctdpechce elo he neehavicashuchss ndpsiacnbacancatacsiascnasereeloenecthatiennimanesnddaameddauatacenhanaacsie 181 182 Pine Se Ui SCC CN ea T TA 182 183 PVN OCC MC OM ora O ae N E A E E E E E E E 183 186 MESSAGES a E A E S E A 186 2 6 Using the History Screens for History Retrieval csccccssssseeesceseseeeseeseeees 187 192 SEEREN E E E A EE E See T A E EE E 189 Dep MAO O e E E cesubosuesteteverachanaustacinehaneteatanvess 189 191 Crin D a E T A E E E 191 192 T E e E E E E T E E enous ee 192 2 7 Using the Alarms Screens nannnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn nenn nnmnnn 193 197 The Alarms Menu oe seep sincivs cc helace cetera ctrce ccc eeepc ee r Aaa eE AEE EEN EN E EEEa ERa ESE 193 194 TEAC A S e E T E E EE ES 194 195 RD ee Var E EAN A E te E E NEA AA E T E EA E 195 Tie Van SEAMS ee E E aesernserceeeseecnsapesancecheues 195 196 The Network Aris SCTE I arsed e E E E RE E E O T 196 TeAm S Ea T E E E E AE E TR 196 197 2 0 Overnid sS oiea eee eel 198 200 Overrides USINE SETVICE SOIC CIS scscosrorransiase n eo ana i O O EO A Ore irar 198 199 Oven ine senor yale aea E E a E acede 199 Overige usine ROGS OWCE cesson E E E cueneeesacee 199 AK2 SC 255 Reference Manual RS 8D M1 22 Devt Overrides using the Manager s Override box EA EEE E E E E E A TAA 199 200 Keyswitch Override for refrigeration high tempera
71. 15 characters The name of what is being measured by the analog input sensor input The default names for the sensors automatically added during configuration of refrigeration are shown and will suffice in many applications They can be edited character by character put the cursor on the field and press to enter edit mode then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that AK2 SC 255 Reference Manual RS 8D M1 22 Devt space When the name appears as you want it press ENTER Beast List box No The value of the point will not be broadcast to be used in logic on other controllers Send The value of the point will be available on the host network for use by other controllers Be sure that each sending Board Point combination is unique throughout the system If the controller at address 01 is sending from its Bd Pt address 1 02 then no other controller can have an output at its Bd Pt address 1 02 sending Rec The value of the point is being received from another controller on the host network You must enter in the Bd Pt fields the Bd Pt address of the sending point Bd Pt Enter the Bd Pt address to which the sensor is wired or in the case of a received broadcast point enter the board and point address of the sending point Type List box AKS 32 100 Danfoss pressure sensor 0 to 100 psig AKS 32 200 Danfoss pressure sensor 0 to 200
72. A275 si Hoanitor inlet temp 2 TYes Fan inverter control 7V0 Hin speed ooreo kee as Tz5 0 Hart epeed a a e a 7100 0 BPM at max speed tlooo Inverter nax resets 73 Inverter reset delay 300 sec Inverter proof delay 20 sec PG DM for more The field information is as follows High pressure bypass Monitor inlet temp Fan inverter control 0 0 to 500 0 The pressure at and above which all fans will be run and at full speed if variable speed motor control is used When high pressure bypass occurs a service technician is required to clear the bypass by using the appropriate button in the status screen List box Yes No Whether the condenser inlet temperature is to be monitored Please see notes on Neutral Zone selection in the section on the first condenser configuration screen List box None No variable speed drive is controlled AK2 SC 255 Reference Manual RS 8D M1 22 Min speed Max speed RPM at max speed Inverter max resets Inverter reset delay Inverter proof delay Devt VO An analog output also known as a VO variable output point on a Danfoss I O module will control the variable speed drive VLT A Danfoss VLT or AKD variable frequency drive will be used for motor control These devices are connected by means of a 2 wire TP 78 LonWorks card 1 0 to 150 0 The minimum percentage of the maxi mum RPM that the fan motors will be run Insure that the ent
73. Comp Reset D z off E z 1 Compressar D 3 oft E System Printer 02 2 Unloader D 3a off a Oo 3 Unloader D 3b off T Ooz 4 Comp Reset D 3 oft E aH Modem SORT On PG DN for more m Service J 2 E Before we go on to discuss configuring miscellaneous alarms for relay outputs observe the icons at the bottom of the screen above right The first icon represents relay outputs the current screen The others from left to right are in reverse video unselected and represent analog inputs digital inputs analog outputs and casc controllers respectively Selecting any one of these icons will take you directly to that area of configuration For each point selected whether an output or input up to 3 different alarm satements can be used and each can be active on a time schedule As an example a meat prep room may be occupied only during certain hours therefore different alarm levels might be useful An example follows for such a prep room controlled by an AKC 164 Smart Case Controller The principles discussed here can also be applied to digital outputs analog inputs or any other kind of input or output In this example the meat prep room is controlled by a Smart Case Controller To find the temperature sensor we must select the case controller icon once we have arrived at the first miscellaneous alarms screen shown at right above The screen might appear as at left below AK2 SC 255 Reference Manual 139
74. Devt temperature and the range about the target used in temperature control The range is the amount above or below target that the actual sensor temperature is allowed to change before a control action 1s taken List box Various types of defrost can be chosen None Hot Gas Time Off Air or Electric 1 to 600 The number of seconds that refrigeration will remain off after termination of defrost Defrost time settings made on the pages that follow must also be considered If a minimum defrost time is used that time must elapse regardless of the settings made on this page If a defrost duration is specified either that time must elapse OR the requirements set on this page must be satisfied for defrost to terminate List box Various termination strategies are listed Defrost sensor There is a dedicated defrost tem perature sensor that will be used to terminate defrost Disch air snsr The fixture discharge air sensor will be used to terminate defrost at a set temperature On Off Input An electrical switch such as a Klixon is wired to a digital input on off input and will be used to terminate defrost None Defrost is terminated strictly on time Hot gas return Hot gas defrost is terminated when a return air sensor reaches a setpoint 99 0 to 200 0 The defrost temperature sensor value at which defrost will terminate List box Yes No Whether or not there is a termina tion relay for each case List box Yes No
75. I that will be on or off according to a schedule Cut In Out OI only Latch OI SI Once turned on by a true rule the point will remain on until a physical switch wired to an OJ is operated to turn it off AK2 SC 255 Reference Manual 153 Undo Cancel Redo Configuring Authorization Danfesi Receive OI SD Minimum SI only The value will be the minimum of up to 5 SIs Maximum SI only The value will be the maximum of a number of up to 5 SIs Average SI only The value will be the average of up to 5 SIs The undo button will undo the last change you made before you pressed ENTER The cancel button will clear all changes since you began editing the point The redo button appears after any undo or cancel and reverses that action Only users authorized at the Supervisor level have sufficient access to configure authorization Supervisors can select Authroization from the Main Menu to reach the following screen 03 01 05 ACCESS Alt hi Account Level Code 1 2 3 4 E 6 1 Supervisor are SH 0 OF OF ODO ODO 2 Complete Sys 12345 50 0 0 O QO 3 Refrig All 12345 50 0 O0 0 U 4 Refrig Set 12345 50 0 O0 hh O0 c HVAC All 12345 50 0 O0 0 O0 6 HVAC Set 12345 50 0 O0 UU 7 larnas 12345 50 0 O0 OD OU Clear Require view access code Ho Audit Trail English Yes Espa ol No Portugues Ho Deutsch No PG DH tor more Note that there are 7 Access levels Auth codes are assigned individuall
76. KV valves Occurs only when modulating control has been selected during configuration The Smart Case Controller is supplying sufficient refrigerant to maintain the target fixture temperature When Area Control status begins the Smart Case Controller learns the dynamics of the evaporator and optimizes internal parameters for the modulated control function After fixture temperature reaches its target if that target is between 23 F and 50 F and after a user definable period default is 60 minutes the status will change to Coil conditioning Coil conditioning AKV valves Occurs only when modulating control has been selected during configuration and only when target fixture temperature is between 23 F and 50 F Once each hour the valve is closed for 3 minutes to eliminate uneven frost build up on the evaporator After 3 minutes control reverts to normal modulating control Low superheat AKV valves The Smart Case Controller has detected a negative superheat for more than two minutes and is reducing refrigerant flow to correct the situation The electronic expansion valve will close for ten minutes then enter Start up status This cycle will be repeated until a positive superheat is established After thirty minutes in Low super heat status an alarm will be generated Defrost A scheduled or manually initiated defrost is in RS 8D M1 22 AK2 SC 255 Reference Manual 169 Danfesi progress For fixtures with AKV v
77. Max Time percentage of the defrost duration chosen during evaporator configuration the defrost will be skipped The schedules screen for an evaporator shows the number of defrost scheduled per day the duration and the start time for each defrost All can be changed from the screen There are three selections possible from the evaporator service menu for Smart Case Controllers Manual Operation AKC 16x Shutdown and Case Cleaning Shut down Selecting Manual Operation from the Evaporator Service menu brings up this screen Service Addr 1 Manual Operation Defrost PE eea a Haximum Manual Time 30 min Antistweat Auta Lighting Auta Fans Auto Valwe Manual Hanual Value 50 There are four fields in which the operating mode for Defrost Antisweat Lighting and Fans can be selected The modes which can be selected are Auto The function is controlled by the normal operation of the Smart Case Controller AK2 SC 255 Reference Manual RS 8D M1 22 Devt Manual On The function will remain on until the mode is changed in this service screen except in the case of defrost which if configured for termination on temperature will terminate on either reaching the termination temperature or the maximum time or until the mode is changed in this service screen whichever occurs first If defrost is set to Manual On the system will remain in defrost until it reaches termination tem perature or until maximum de
78. S Night setback offset _ 5 0 F Minimum M time 7 min Minimum OFF time min Num of cooling stages Control cooling using Target differential Target temp for stage Pre delay for stage Post delay for stage RS 8D M1 22 0 to 3 The number of cooling stages in this HVAC unit List box Return Air Cooling will be controlled to satisfy a return air target temperature Average Cooling will be controlled to satisfy an average zone temperature target High Cooling will be controlled to satisfy a zone target temperature for the highest of a number of zone temperature sensors Zone 1 etc each supply zone temperature sensor will be available as a choice in the list Control will be based on the single selected sensor 0 1 to 100 0 The differential selected creates a control dead band around the target temperature For example if the target 1s 72 and the range is 2 the stage will come on at 74 and will not be turned off until the temperature reaches 70 0 0 to 99 9 A separate field for each of the stages in the unit 0 to 15 The number of minutes that must elapse after target plus range is reached before the stage will come on There is one field for each stage 0 to 15 The number of minutes that must elapse after target minus range is reached before the stage will be turned off There is one field for each stage AK2 SC 255 Reference Manual 83 Humidity adjusts target
79. SED hours List box Post delay Heat ramp up if LAT gt Cool ramp up if LAT lt Dehm ramp up if LAT lt Continuous The fan will run continuously during hours when the store is not open Store open hours are defined in the Store Info screens On demand The fan will run on demand during hours when the store is not open whenever heating cooling dehumidification or venting is called for 0 to 60 The number of minutes the fan will run after the last stage of heating cooling dehumidification or venting is turned off 40 0 to 150 0 When heating is on fan speed will be ramped up when LAT leaving air temperature is greater than this setpoint 40 0 to 70 0 When cooling is on fan speed will be ramped up when LAT leaving air temperature is less than this setpoint 30 0 to 60 0 When dehumidification is on fan speed will be ramped up when LAT leaving air temperature is less than this setpoint Aux Heat ramp up if LAT gt 0 0 to 100 0 When heating is on fan speed will be ramped up when LAT leaving air temperature is AK2 SC 255 Reference Manual 8 1 RTC fan page 2 Speed Inverter Heating Cooling Dehumidification Speed control increment Speed control decrement Variable Output range Reaction Time Algorithm Interval Inverter max resets Inverter reset delay Inverter proof delay Monitor phase loss Shutdown on phase loss AK2 SC 255 Reference Manual Davee greater than
80. TER List fields are ones like the field in this screen about midway down the left side called Float Suction On To change the contents of list fields put the cursor on the field and then press the EDIT key This toggles the function of the arrow keys from their navigation mode to their selection mode Next press one of the arrow keys and you will see the field contents change again only if you are authorized At a PC move the cursor to the field with the arrow keys then right click to enter edit mode and select from the box using the UP ARROW and DOWN ARROW keys or your mouse When the contents are what you want press ENTER or left click to save the selection and return the arrow keys to their navigation mode Now let s leave the Suction Settings screen and use the icon menu to enter the Suction Schedules screen Press MENU to return to the icon menu at the bottom of the screen Move the cursor to the schedules icon which looks like a clock face with the first quarter hour sliced out Press ENTER Hight Setback Hight setback schedules 1 Schedule 1 From 1l 00 AM Days SATURPSA To RS Holidays BEA HEB oA SSS Sy From the menu pressing the UP ARROW will put the cursor on the number of schedules Notice that right now the screen shows 1 schedule If you raise the number of schedules additional schedules will appear on the screen and on additional pages If you reduce the number of schedules schedul
81. Temp Control will be based on saturated condensing temperature as computed from a pressure sensor on the discharge header or drop leg An analog input sensor input was automatically created for the suction group Avg Cond Temp This option is provided to allow for the control of a condenser that is being fed from multiple racks controlled by the same AK2 SC 255 Either dedicated pressure and temperature sensors can be installed and configured or clones of existing discharge pressure sensors can be created in Miscella neous Calculations and the clones used for average condensing temperature control Number of sensors 0 to 8 appears only if Avg Cond Temp is selected The number of temperature sensors being averaged Monitor dropleg temp List box Yes No Whether the drop leg temperature will be monitored A 36 AK2 SC 255 Reference Manual RS 8D M1 22 Devt Yes answer here will create an analog input sensor input for the drop leg temperature sensor Appears only if control is not by dropleg temperature Control method List box Target The condenser fans will be controlled to maintain a target pressure dropleg temperature or saturated condensing temperature depending on which strategy 1s selected by the answer to the Control sensor question above Cutin Cutout The condenser will be controlled by cut in and cut out based on target pressure dropleg temperature or saturated condensing temperature depending on which st
82. The Holiday screen looks like this Holidays 4 Holiday 1 Start z Jan 1l Open lz 00 AM End Jan Ll Close 12 00 AM Holiday 2 Start Jan Ll Open 12 00 AM End Jan Ll Close 12 00 AM PR DMN for more First some number of holidays other than 0 has to be entered in the Holidays field The holidays are numbered and the numbers correspond to the numbers used in schedules which we just talked about To the right of each holiday number is a space which you can use to enter a name for the holiday To enter or change a holiday name or any other name move the cursor to the name field and press the EDIT key Now the left and right arrow keys move you through the letter spaces in the name field and the up and down arrow keys change the character When all the characters have been entered in the way you want them press ENTER to save the change and restore the arrow keys to their navigation function AK2 SC 255 Reference Manual RS 8D M1 22 Devt 2 2 Using the Service Screens Service screens for Smart Case Controllers are discussed in Section 2 3 which follows this one The service screens for refrigeration HVAC and lighting have special functions for system diagnostics and maintenance Typical is the Suction Service menu reached by selecting the service icon from a Suction Status menu of 02 200 10 51 43 AM at Authorization HVAC fal Store Info 7 Lighting AKZ 8C255 Info Alarms Communi c
83. The second temperature and range for a dual temperature evaporator Num of shutdn schedules O to 8 The number of shutdown schedules that will be entered on the page s immediately following this one Generate shutdown OI List box Yes No Whether or not a digital input on off input will be configured by which refrigeration can be shut down for cleaning or other service Paging down we reach the shutdown page s Confiqure Back A Low Temp AA E Evaporators Shut domn Schedules Sched 1 time Of T Sched time off 7 12 00 AM Sched 1 d s oon eee eae T Sched 1 holidays Le345678 Sched time Of 7 122 00 4M Sched time offf 7 12 00 AM Sehed lt darso a aa ee gen ae T Sched holidays 7 Le345678 PG DM for more There are two schedules per page Each schedule has a field for time on time off days of the week and holidays AM and PM are entered by selecting the first character using the key to toggle the arrow keys to edit mode then using the up or down arrow to change the character to A or P as needed The same means is used to select the days of the week once the cursor is placed in the space to the right of the question and holidays Holidays are given dates when Store Info is configured Evaporator alarms are configured on the last page for each evaporator The right illustration shows the screen when it is opened for the first time The right illustration
84. This is the area that will contain the logical statements that determine whether the point is on or off OI or the value SD that is used At the bottom of the area is the current value of the result Let s create a point now Afterwards we will discuss each area and field in detail It is important to plan the strategy first Custom strategy example We want to control a compressor room exhaust fan We want the fan to run when ever the compressor room temperature is 90 F or higher we also want it to run in case of a refrigerant leak of 500 ppm or more So let s list the types and values we will need Ol calculated point to control the RO SI F misc SI compressor room temperature Num 90 the temperature setpoint SI ppm misc SI leak detector sensor see note Num 500 the leak ppm level RO to control the fan Note the leak sensor may not need to be configured as a miscellaneous sensor if there is a standard leak detector configured Instead we will just select SI ppm as the sensor type and then pick the sensor from the list that appears under data definitions It is important to understand that only the OI will be created in the calculated points screen The state of the OI will depend on the evaluation at any time of the logical statements that we are going to write The other points the RO and the two SIs will be created as miscellaneous points Creating the miscellaneous points Sensor inputs Now we will create the fir
85. Whether or not there is a termina tion input each case Paging down produces the next page HS Configure Back a 01 00 16 PH Low Temp AA E Evaporators Uze min defrost time Yes Minimum defrost time 730 Antisweat control TYes ON when dewpoint abovre 40_ 0 F Cycle above dewpoint 7 30 0 F Antisweat cycle time 7 Z0 min F n control ie ee TYes Fans on during defrost Yes Stop fan on high temp Yes Fan stop fen 2 7 S0 0 F Fan delay control 2 2 TYes Start f n on Game 22 2 TYes Pelar Cine eee ee nae ee eer 15 min Monitor door position Bares DE CH for more AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 Devt Defrost time settings made on this and the following pages work with the termination settings on the preceding page If a minimum defrost time is used that time must elapse AND the settings for defrost termination temperature or switch must be satisfied If a defrost duration is specified either that time must elapse OR the requirements set on this page must be satisfied for defrost to terminate The fields are as follows Use min defrost time Minimum defrost time Antisweat control ON when dewpoint above Cycle above dewpoint Antisweat cycle time Fan control Fans on during defrost Stop fan on high temp Fan stop temp Fan delay control Start fan on time Delay time List box Yes No Whether or not minimum defrost time w
86. ached The time or temperature is determined by the next two questions List box Yes No The answer determines whether or not fan delay ends after a specified time 0 to 20 The number of minutes before fans start after defrost terminates AK2 SC 255 Reference Manual 31 32 Fan starting temp Monitor door position Configuring Defrost i Configure Back A Loysoryzooz Danfesi 58 0 to 99 9 The temperature at which fans will be started after fan delay if fans are not started on time List box Yes No Whether or not an alalog sensor input is created to monitor the position of the door This sensor reads in percent and will be seen on the status screen for the circuit An alarm can be based on it Defrost configuration begins on the next setup page for an evaporator circuit 01 02 39 PH Low Temp AA a Evaporators Wo of defrosts per day 1lz Defrost duration _ _ 7 30 min Defrost start time 1 l2 00 AM fe 12 00 AM 3 12 00 AM 4 12 00 AM 5 12 00 AM 6 12 00 AM 7 12 00 AM 8 12 00 AM 9 12 00 AM 1l10 1 00 AM 11 1l1z2z 00 AM 12 12 00 AM Allow detirost skip 2 TYes Hin time between defrost Owerride on dewpoint Yes Don t skip when DFP above Dual Tenp control TYes Alt target 35 0 F The fields are as follows No of defrosts per day Defrost duration Defrost start time Allow defrost skip Min time between defrost Override on dewpoint
87. active and cleared alarms for all the SC 255 s in the network The format of the screen is the same as the format of the Active Alarms screen and the Cleared Alarms screen which are discussed above The Alarm Service Screen The Alarm Service screen is reached by selecting Service from the Alarm Configu ration menu 196 AK2 SC 255 Reference Manual RS 8D M1 22 Alarm Service Clear Alarm Logs Clear Network Log Clear All AFC 55 Logs Delete Alarm Config Send Test Alarm Generate system test alarm Normal Send on days SMTWEFA at 09 00 AM Suspend alarm generation We The fields in this screen and their uses are as follows Clear Alarm Logs In this SC 255 only both the Active Alarms log and the Cleared Alarms log will be cleared of entries Clear Network Log Clears the Network alarms log for the entire AKCESS network Clear All SC 255 Logs Clears Active Alarms logs and Cleared Alarms logs in all SC 255 s in the system Delete Alarm Config Deletes the entire alarm configuration in this SC 255 only Send Test Alarm Sends a single test alarm The Generate system test alarm function see below must be enabled Generate system test alarm Provides a means of generating a test alarm on a regular schedule You can select the days of the week the time of generation and the alarm action level This function must be enabled with a schedule which is true for the Send Test Alarm function to operate Suspend alarm genera
88. aded before being cut out The next page of compressor configuration deals with neutral zone control Basically neutral zone control acts to bring the current pressure toward target pressure more quickly the greater the difference between the two The screen looks like this Neuer als s nen ee ee B i Delay Pe Se ae ie eee ee eae 7170 sec Minus zone oan ee eee 60 sec PG DM for more The default settings are as shown in the screen above It is recommended that the values not be changed without a thorough understanding of the algorithm A thorough explanation of neutral zone control is available as an appendix to this manual RS 8D M1 22 AK2 SC 255 Reference Manual 23 Donfsi Compressor capacity staging patterns Paging down from the neutral zone screen reveals the compressor staging pattern screen Low Temp AA Steps 16 1 Hz 13 4 3 z0 0 4 z6 8 5 33 4 6 40 0 7 46 5 PR DN for more In the default screen the staging pattern is Auto for automatic staging and there is no selection for Steps The controller will stage rack capacity in the smallest steps possible from lowest total capacity to highest automatically selecting the compressors combination to run for each stage based on the the configured compressor capacities available on the rack When there are a large number of steps manual staging can be used to eliminate needlessly small steps and compressor cycling To u
89. aeneusbashaciemadebleaetauecadansnseaseawsaetoaal 105 Schedule confir uranon C Nita WE CE sssssecasns scenes vincusoeiavecsevacecneacaatnannaseseatessquuees 105 P O Comite vr sO C imal EC H eee EEE E E 105 Relay outp ts digital outputs Clima TECH scssscsssssuascenanatnanisesoennonaasernseravemeancavasaetaneacaamoesausedes 106 Sensor inputs analog inputs ClimaTECH sccsdestscedeatvessestvancehweeoarhwsheonsdedeondiieneticiesegsabesauces 106 107 On off inputs digital inputs ClimaTECH enesciescctsdvsnsnccasksaeusvaiennataecacssvesioslauisesmiawinrsienes 107 108 Address and Initialization ClimaTECH 0000seseneneseeeescsesesesesssecoscsesesesesesssssscsososrsesrssseseesesesesesrssoe 108 Uploading ClimaTECH configuration to the AK2 SC 255 eeseseeeeesssssssssssssssssssssssssse 108 109 1 4 Lighting Configuration sassssnsnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nennum nnmnnn mnnn 110 114 eE E e E E EE EE E N rer E E me rrets 110 AK2 5C 23 li nUn ZONE SOU errn E 110 113 Board amp points configuration lighting sseesseesssssssssssssssssseeteseterrrrssssrssssssssssssssssseeeerreerreessssssssssssssssses 113 Powel ikooni OI e E E E 113 Cuder Hammer Conio ar aO a e ones conse sue E E E AE E E A E 113 Powerlink and Cutler Hammer board amp point configuration eeeeseessesssssssssssssesssseseterererrresssssssssssssssssee 113 LoCo TOC UU rr E E E E A E E E 114 1 5 Energy Meter Configuration includ
90. ages Setpoint Range 96 H Configure 54 Unit 4 Number of zone sensors Controlling Sensor lt Man of heat relm Stages 7 J ae a A Heating Ra 13 SEEPOLN E A a a A wees nee norz OSE F nger a fel Re i EE se de lee gt af Wum of aux heat stagqes t4 Set al a a lh o er ee A E Serge aay 7 69 0 F Parnge cies e ye emer AL Aven ate Cire PSB he Ambient temp lockout Yes No heat abore 7 7O 0 F Fanger teat ms eles pea eee mea Io 2 OFF Minimum run tbime TZ min Delay between stages 73 min Night Setback o o eneas TYes Night setback offset 7 5 0 F verride switch qi es Override duration _ _ Num of schedules PG DN for more 0 to 5 The number of zone temperature sensors List box Min Temp Control will be based on the lowest value of all of the zone temperature sensors Max Temp Control will be based on the highest value of all of the zone temperature sensors Average Control will be based on the average of all the zone temperature sensors Zone Temp 4 1 etc each zone temperature sensor will be available as a choice in the list Control will be based on the single selected sensor unit 0 to 4 The number of heat reclaim stages in the SC4 0 0 to 100 0 The desired temperature at the control ling sensor when heat reclaim is being used 0 0 to 9 9 The range selected creates a dead band AK2 SC 255 Reference Manual
91. air cooled condensers when Sat Cond Temp is selected as the Control sensor The change to saturated condensing temperature control strategy causes several of the following questions to be replaced by new questions Not all the fields discussed in the following explanation occur on the screen at one time lo 1l1l 2o002 Ei Configure Back A Condensers Condenser type 2 2 miir Cooled Condenser type i o n tir Cooled MWumber of fans 7 6 Humber of ans co 625 235 7 6 Fan Staging 22 2222 525 Individual F n staging oo a ee a t Individual Monitor stages TIndividual Monitor stages o gcse eee Individual Control sensor oo ane noa Pressure bone rol sensor o rocon tat Cond Temp Monitor dropleg temp Yes Monitor dropleg temp Yes Bons rod method nen ae TTarget Target control type TRhamp together Target control type TRhamp together Ramp stages if ambient lt oO 0 F 1 0 Ramp stages if ambient lt o 0 F 1 0 Min sat cond temp 7 60 0 F Max sat cond temp erly eel et Condenser Delta T TENES OAE Targeta AN a eS T 150 0pi Heat reclaim offset T z0 00psi PG DMN for more PG DN for more Aircooled condensers There are five configuration pages for aircooled condensers In the first page are the following fields refer to the illustration at right above Condenser type List box This section deals with condenser configu ration when the selection Air C
92. alves the valve is closed and the defrost control relay is ON For fixtures with KVQ valves the valve is open or closed according to configuration by the user Make sure that the KVQ is configured to remain open during gas defrost The KVO valve may not be used as a suction stop Terminated defrost The Smart Case Controller has terminated defrost and is waiting for other coordinated controllers 1f any to terminate The valve remains in the state it was in during defrost Refrigeration will not resume until all coordinated defrosts have been terminated Start after defrost A transitional status following termination of defrost including drip down and fan delays After drip down AKV valves begin to open at a predetermined percentage for a maximum of two minutes to establish minimum superheat When fan delay is finished and minimum superheat is reached status will change to Cut in After drip down KVQ valves operate normally until the completion of fan delay when status changes to Normal Operation Valve in manual The valve has been set to a manual percentage by override Auto operation is suspended When the valve has been returned to Auto mode the status will change to Start up for AKV valves and to Normal Operation for KVQ valves Box door shutdown Operation has been interrupted by opening of a box door When the door is closed status will change to Start up External shutdown The fixture has been shut down usi
93. ard amp points configuration ssegron vinta ia dau ates adecatienaneteaeet 76 AU Conn RAGIN o A E 76 80 AHU AC OM PEON ATION oi caaeteet coed E N E E E 76 78 AHR outside it COM COU FO IE MUO eesse eE 79 80 RPC Brest hes shack 1 aaeeeeer norte nnn CMe nen none e rete heyy cn eyneeT Tn n TE tener Tenney eeeer eter ns errant 80 93 BOC Tate Of 0 OE AIO secs costa t cecpcnsanaee E S A 80 83 RICcoohng Cirle orao seserian anor aea an T r A TE aeania 83 84 RIC hoanne CO i AUN spss E E 85 86 RIC debhumidification confic ration ga gyeczecacsncieqyseshace stata nna e eaaa 86 87 RIC Bi ame CO TAG OG sones ae 87 89 lB Gee eeii ent erent E ene ene verre eee eee ere eee erry eer eee ee 89 BC ir CO PO AO oes savas crests cceas acca E ous ceseaeauesisesmnnaastssaes 89 FCO PO tS Ct OI sence ep asec N E E E EN 89 92 Relay outp ts digital OU INES ascot cc tcicsconecatcunticomsininenewetaccieate ossdsnannaaneeetaeanan enninu eaaa Eriin 90 Sensor inputs analog IMpUtS cazeeccctacaentcteecopcasscuescetnetacihen oa ian a i aie ae i aa aeae iea 90 91 nie OE inputs CCT LAE TES sesen e e 91 92 RTC I O Variable outputs analog outputs iscccsssesseacenerescorermnsasunaacecpnccvaseaadeateusenetevanaversaanaceenes 92 93 RIC address md a oe AOA soppen E EET 93 94 Seasons 4 SMa GC OC Oi OU Al OM sssini ae aeie a eiS 94 98 Fan cOnlisuration Seasons 4 Smart C oilsssrisssenosii raie 94 Cooling configuration Seasons 4 Smart Coil ssesessess
94. at left below and configure an actual alarm Move the cursor down to the level field for the Phase Loss alarm It currently reads Disabled When you select the field a list box ap pears showing all the levels that can be chosen for the alarm as shown at right below 124 AK2 SC 255 Reference Manual RS 8D M1 22 03 55 49 PH O4 O7 2003 O3 57 41 PH Type Nane Address Type Nane Address Alarms Suspended Hack C T Back C T Disabled Phase Loss Phase Loss C os 1 Phase Loss C os 1 Low Pressure Suction Pres C d6 l Suction Pres C 06 1 Disabled High Pressure Suction Pres C 06 1 High Pressure Suction Pres C 06 1 Disabled Disabled Low Temperature Suction Temp C 06 5 Low Temperature Suction Temp C dO6 5 Disabled Disabled PG DN for more PG DN for more Notice that in the screen at right above we have moved the cursor to Normal in the list box When we press ENTER the level selection is complete and a condition appears under the name of the alarm as seen at left below eens An O4 50 52 PM a Units Languages Address Pressure De1 Alarms Suspended Hack C E Temperature F Disabled Phase Loss Phase Loss C os 1 Date aM DDT Normal On for WE Low Pressure Suction Pres C d6 1 Time 12 Hour Disabled High Pressure Suction Pres C 06 1 Language English Disabled Low Temperature Suction Temp C 06 5 Light Level percentage Disabled PG DN for more After choosing an action level for the alar
95. ate initially until you change them A description of each enabled alarm action follows Log Only The occurrence of the alarm will only be logged by the system There will be no dial out The alarm will not retrip until its causative condition has returned to normal and then occurred again Normal The alarm will occur when its causative condition has been true for the set time limit At this action level the alarm will dial out once It will not dial out again until its causative condition has become false and then become true again for the set time limit Critical When the alarm s causative condition has been true for the set time limit the critical alarm will occur and dial out and it will continue to dial out repeatedly as long as the causative condition remains true Repetitive dialouts will occur at the interval specified in the Alarm Routing screen See also the section on Alarm Routing Delete The alarm and its settings are removed from memory Restoration of the alarm requires manual re entry Alarms Suspended The first alarm on the first page of every rack alarms screen is an Alarms Sus pended alarm This alarm occurs whenever alarms have been suspended by an operator using the Rack Service screen When alarms are suspended if the level of RS 8D M1 22 AK2 SC 255 Reference Manual 123 Dave the Alarms Suspended alarm is set to an action other than Disabled a single alarm will occur and if the level is Critical o
96. ations i Energy Conftiquration z Miscellaneous History S Auto Manual Relays The first two selections are similar Select Auto Manual Relays and a service screen will appear listing all the relay controlled devices in the suction group o3 027 200 11 49 44 AM Suction A Service Manual Operation Helays Compressar AAl Autoa On Unloader Ala Auto oOft Unloader Alb Auto Oft Unloader Alc Auto oOft Unloader Ald Auto Oft Oil Reset AAl Auto Oft Inv Reset AAl Auto Oft Inv Bypass AAl Autoa Oft i Beset E E h a a Next to the name of each one is a control status field You can select Auto The AKC 55 is controlling the on off relay output Manual On The relay output is in override and will remain ON RS 8D M1 22 AK2 SC 255 Reference Manual 165 until reset Devt Manual Off The relay output is in override and will remain OFF until reset To change the control status of a single relay output simply place the cursor on the status Auto Manual On or Manual Off toggle with the key use the arrow keys to change the field and then press ENTER lt Reset gt In the center at the bottom of the screen is a lt Reset gt field If you place the cursor on this field and press ENTER all relay outputs will be reset to Auto SC 255 con trol Sensor Adjustment Sensor Adjustment Service 11 54 49 AM Name Man Current Offser Input Suction Pres AA p l3 zpsi 0 0 0000
97. ations section which follows in a few pages Miscellaneous conversions are used for sensors that have an output range or range to value relationship not already defined as one of the named types in the sensor input configuration list box To configure a miscellaneous conversion select Conv Factors from the Configure Miscellaneous menu The Configure Conversion Factors screen appears The field contents which may be selected and the range of values for each are as follows Units psi bar F C ppm V Amp kw kwh Hz gpm fps pH Min input 0 0 10 0 Max input 0 0 10 0 Min output 0 3276 7 AK2 SC 255 Reference Manual RS 8D M1 22 Devt Max output 0 3276 7 Select the units for the sensor reading then from data supplied by the manufacturer enter the minimum and maximum input voltage and the values which correspond to each Remember that the custom conversion factor must be selected from the list box for the Sensor Type field during configuration of the sensor input that uses the conversion Miscellaneous calculations Miscellaneous calculations are used to create custom logic A calculated point created here can be used anywhere a board amp point address can be referenced The calcu lated points processor is a true boolean processor with a full complement of argument types and operators Examples follow this section Right now let s investigate the screens one by one as far as we can in g
98. ay Omin TNS alle Bane sae IC Cee eE Sal ie E Auxiliary Heat type Thtaqing F n speed se eee teee o ee ne THigh Speed Nighe Setback 2223 se TYes Night setback offset 7 5 0 F Override Switch r ee TYes Override duration r 7 60 min Mum of schedules T 1 High supply temp lockout Yes Lockout abowe 150_0 F Deadband Z 0 F PG DN for more Number of zone sensors Controlling sensor RS 8D M1 22 AK2 SC 255 Refe 0 to 5 The number of zone sensors for the rooftop Changing this number will also change the number of zone sensors in the first line of the first cooling configu ration screen List box Min Temp Control will be based on the lowest value of all temperature sensors in the unit s zone Max Temp Control will be based on the highest value of all of the temperature sensors in the unit s zone Average Control will be based on the average of all the temperature sensors in the unit s zone Zone Temp 1 1 etc each zone temperature sensor will be available as a choice in the list Control will be based on the single selected temperature rence Manual 69 RTU Heating auxiliary heat configuration p2 staging strategy Num of heat rclm stages Target temp stage 1 Pre delay Post delay Range Auxiliary Heat type Fan speed Night setback Night setback offset Override switch Override duration Num of schedules High supply temp lockout Lockout above
99. battery life is a minimum of ten months but the battery is only used when main power is interrupted In a unit which rarely experi ences power interruptions the battery can last as long as eight years If the battery is disabled by removing it or when it ultimately discharges completely any information stored in the unit set points schedules etc will be lost Do not remove the battery When the SC 255 is turned on for the first time the Main Menu will appear as at left below Supervisor Togo Auth SAA Log Out fal Authorization Account Audit Trail udit Authorization Origin Lvl HVAC E Store Info 00001 00001 02 28 05 09 244 Keypad 1 01 7 Lighting AKZ 8C255 Info Alarms Communications i Energy 4 Conftiquration E Miscellaneous History Before you can enter configuration information you must select Authorization and AK2 SC 255 Reference Manual 11 Using menus Selection of Units and Language Devt enter a valid authorization code and account code Using the right arrow move the cursor to Authorization and press ENTER The Authorization Menu will appear as at right above with the cursor in the Auth field When you have entered the access code and account number given to you by the system owner you will see the words Authorization accepted appear briefly in reverse video at the very bottom of the screen In the upper right the screen will show what the authorization level is After initial config
100. buttons on either side of the mode indicator allow you to scroll through the collected history when in snapshot mode Stat The Stat button at the bottom left of tabular History Display screen body brings up a display of statistics for the four points selected The statistics given depend on the type of point whether on off relay outputs on off inputs or variable sensor inputs variable outputs calculated values Here is a sample statistics screen Rate Datapoint DP1 02 Mins Suction Fres AA DP2 02 Mins Suction Pres AB DPS 02 Mins Subcool Tip AALl DP4 02 Mins Subcool Tmp AA DPS 02 Mins Suction Temp AA 24 Hour DP 1 DE 2 DP 2 DE 4 ODP amp Minimum 4 4 Pee ddel 25a A S Maximum 14 1 11 2 46 6 45 7 23 7 Ayerage Dadl 2 0 40 0 40 4 ZT To change the twenty four hour period covered by the statistics report return to the History display screen and scroll until the last line on the page is the ending time you want for the statistics report then press Stat again 192 AK2 SC 255 Reference Manual RS 8D M1 22 2 7 Using the Alarms Screens The Alarms Menu From the main menu select Alarms and the Alarm Menu appears O4 44 16 FMI Asctive Alarms M Cleared Alarms Alarm Status Network Alarms iB Configuration The menu items are as follows Active Alarms An active alarm is any alarm whose condition is still out of bounds whether or not the alarm has been acknowledged Any active alarms among the mo
101. ct setpoint List box Yes No When the pump is on because of high discharge pressure whether or not to shut down the the pump at the freeze protect setpoint List box Yes No Whether or not there is a water flow monitor The next page allows entry of the first four dump schedule A subsequent page will be added if there are more than for schedules Schedules have been explained in the AK2 SC 255 Reference Manual RS 8D M1 22 Devt earlier section on evaporator defrost configuration The screen is not shown here Receiver configuration To configure the receiver return to the Configure Rack menu put the cursor on Receiver and press ENTER The screen is as shown below LO 10 2002 01 05 57 Po ES Configure Back Receiver Surge Re OMG Er Gili ioe fres utin eoe e a 765 0 F eE OUT e e oe ene ener trees TOL UAE Liquid level sensor typetSensor Input Surge control List box Yes No Whether or not surge control will be implemented Cutin 0 0 to 100 0 The temperature at which the surge valve opens Cutout 0 00 to 100 0 The temperature at which the surge valve closes Liquid level sensor type List box Sensor input An analog sensor is used for liquid level On Off input A digital sensor is used for liquid level None There is no liquid level sensor monitored Heat reclaim configuration To configure heat reclaim return to the Configure Rack menu put the cursor on Heat Reclaim and press
102. d 1 the schedule must be true and 2 the photocell must be above trip level Once those two conditions are satisfied the pre delay AK2 SC 255 Reference Manual 111 Lighting configuration page 2 Enable failsafe schedule Time on Time off Photocell range Trip Level Always keep 1 relay on Auto rotate selection Devt timer will start Schd or photo For this point to be on either of two conditions must be satisfied 1 the schedule must be true or 2 the photocell must be above trip level Once one of those two conditions is satisfied the pre delay timer will start List box Yes No Whether or not a schedule will back up in case the photocell fails Time of day field The time at which the pre delay timer for outside lights will start without the photocell having tripped Time of day field The time at which the post delay timer for the outside lights will start without the photo cell rising above trip level O tol00 The number of percent from night to day O tol00 The level at which the photocell condition will be true and act to turn the lights on If multiple relays are configured there will be one trip level per relay List box Yes No Appears only when there is more than one control relay Whether or not one relay will always be on List box Yes No Whether or not the one relay kept on will rotate among all the relays configured Rotation takes place so that the same re
103. d at 500 ppm or more turn on the fan else turn off the fan This is exactly what we set out to do AK2 SC 255 Reference Manual RS 8D M1 22 Devt Creating the miscellaneous points relay output Exit to the Configure Miscellaneous menu and from there select Relay Outputs and press ENTER The configuration screen for a relay output appears 10 36 30 AM L1fl2 2002 11 0102 i om CFE mia Lelay Outputs Wo of relay outputs 1 Mane Beast Bd FPte On Compr Bm EXFAN Wo o4 7 W Open The first step in configuring a miscellaneous RO is to increase the field No of relay outputs by 1 In this example we re increasing 0 to 1 because this is the first miscella neous RO to be configured Here s what to do and where to do it Name Label any 15 characters Edit the field to read appropriately to the purpose Beast List box No Send Rec Leave the Beast field set to No We are not going to use the point elsewhere on the network Bd Pt Bd Pt label In the Bd Pt field enter the number of the board and terminals where the RO will be wired On List box N Closed N Open Because the normal state of the fan will be off we will wire through the normally open contacts for the output relay Notice the character gt that is in reverse video in our example above This is a button field and when it is selected ENTER will take you to the next page Initially the second page of this screen appears as at
104. d Pt 05 1 Low Temperature Normal Low Temperature Normal If below 17 0 F for 30 min If below 17 0 F for 30 min High Temperature Wormal High Temperature Normal If above 38 0 F for 30 min If above 38 0 F for 30 min Delay after defrost for 60 Min Delay after defrost for 60 Min Eey switch override Yes Eey switch override Yes Select misc point Mot configured Select misc point Mot configured Delay after override for 39 min Delay after override for min Note that the second alarm is a high temperature alarm and that it has an extra line in its configuration Delay after defrost If a delay other than zero is entered the high temperature alarm will be disallowed following termination of defrost provided defrost is monitored for the specified number of minutes The time unit can not changed The time is always in minutes The key switch override is made functional by having a physical switch usually operated by a key to prevent inadvertent operation or tampering and by having configured a miscellaneous point for the switch which is then wired to that point The logic written for the miscellaneous point will prevent alarms after the switch is operated for the time specified as Delay after override Such an override might be used for case cleaning extensive re stocking or service For circuits controlled by AKC 164 Smart Case Controllers there are in addition to the high and low temperature alarms discussed in the preceding section a numb
105. d by the system Selecting Fan from the unit brings up the first fan configuration page shown on the left below the second page is shown at the right 80 AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 Post Gearon ee oe er Heat ramp up Le LAPD oS tee Cool ramp up if LAT 54 Dehn ramp up if LAT 44 Aux Heat ramp up if LAT 654 Speed Min Inverter 50 Heating 50 Cooling 50 Dehumidi fication 50 dux Heat Speed control increment 5 Speed control decrement z Tariable Qutput range T70 10 Volts Fan type Fan control OPEN hours DEG CH Configure ETU Peaction Timen ec here he erent Algorithm Interval 710 Inverter Wax resets TOS o F Inverter reset delay 7 300 sec 5 F Inverter proof delay 7 15 sec F o F Monitor phase loss TYes Hax Which phase loss monitor Mot configared 0b loo o Shut domn phase loss TYes 0 loo o Shutdown on Snore detect Yes 0b 100 0 Shutdown on fire alarm Yes OF 75 0 100 0 for more List box 1 Speed Single speed fan Variable VO Fan speed is variable with a drive controlled by the RTC board s analog output variable output List box Continuous The fan will run continuously during open hours Store open hours are defined in the Store Info screens On demand The fan will run on demand during open hours whenever heating cooling dehumidification or venting is called for Fan control CLO
106. d from then on in the order in which they were created The sorting occurs when you press EXIT and will be apparent the next time you enter the screen Board amp Points Other controllers When you select the Other Controllers icon and press ENTER a menu is presented that allows selection of any of six types of other controllers that can be nodes on the control system I O network 56 AK2 SC 255 Reference Manual RS 8D M1 22 AKC 16x VLT EEC 5 Bitzer DEG MASTER He DCU TTE AKC 16x circuits Board amp Points You will also see these icons at the bottom of any of the Other Controllers screens Selecting the first one whether from the menu or from the bottom of the screen produces the related configuration screen Here s the one for AKC 16x Smart Case Controllers 10102002 Confiqure Back SEC lex ARC lex Controls Name Address Init Circuit AL3 0 Init The fields and contents are Name Label field any 15 characters The name of the evaporator being controlled by the AKC 16x AKC 16x refers to AKC 161 AKC 164 or AKC 165 controllers whichever is configured on each node The default names for the AKC 16x circuits automati cally added during configuration of refrigeration are shown and will suffice in many applications They can be edited character by character put the cursor on the field press to change to edit mode then use the left RS 8D M1 22 AK2 SC 255 Reference Manual 57 Danfe
107. d line under Name and open the list box This time select Number F from the list be careful there are several Number items The screen will look as at left below Move right to the data definition and change 0 0 F to 90 0 F which is the temperature setpoint in the strat egy we are creating and the screen will appear as at right Again the value field has changed to reflect the value of the defined point AK2 SC 255 Reference Manual 147 148 The rules area L1 f12 2002 11 0502 CFG z 47 01 PH L1 f1l2 2002 11 0502 CFG El Configure Ca Ol O13 i Configare Ca Ol Unites OI ndo Cancel Units al ndo Cancel Style Generic Style Generic Data Definition Value Data Definition Sill gus z Compr Bm Temp O 0 F SIl gos z Compr Bm Temp Oo 0 F Num 2 o 0 F o 0 F Num ERE 30 0 F Value les Value STITT isi ft TLerror celts Ue TLerror True On On True On On Current Value 7 Error 7 On Current Value 7 Errori On In the same manner we want now to define a sensor argument SI ppm for the leak sensor and a number argument Number ppm for the setpoint 500 It does not appear that there is any room left in the data definitions area but we can easily expand it Select the heavy horizontal line at the bottom of the data definitions area and it will appear as at left below Toggle to edit mode and as you can see at right the opportu nity
108. dules configured in the Store Info screens 50 0 to 50 0 The amount by which the cooling setpoint set on previous page is to be raised during store closed hours as set in the Store Info screen 0 to 60 The minimum number of minutes cooling must run after being turned on before being turned off 0 to 60 The minimum number of minutes cooling must remain off after being turned off before being turned on RS 8D M1 22 RTC Heating configur ation 10 15 2002 09 47 45 AM Jf Configure RITU Z Heating E Mum of heating stages 7 2 Control heating using 7 Return Air Target differential ae Looe 6 a E Target temp for stage 1 69 0 F 2 69 0 F Pre delay for stage fl O min f2 min Post delay for stage fl O min f2 min Ambient heat lockout 7 Yes We heat above noe oenen 70 0 F Wight sethack Wight setback offset 7 0 F Minimum OW time 7 min Minimum OFF time min Num of heating stages 0 to 3 The number of stages of heat in the unit Control heating using List box Return Air Heating will be controlled to satisfy a return air target temperature Average Heating will be controlled to satisfy an average zone temperature target Low Heating will be controlled to satisfy a zone target temperature for the lowest of a number of zone temperature sensors Zone 1 etc each supply zone temperature sensor will be available as a choice in the list Control wi
109. e it will still dial out once 2 Anormal alarm which is acknowledged before dialing out will not dial out 3 When all active alarms have been acknowledged the flashing Alarm notification that appears in the top blue border of every SC 255 screen will be turned off 4 The Ack field in the Active Alarms screen or the Cleared Alarms screen will be changed to Yes 5 In the detailed alarm screen in place of the Acknowledge button will appear the level and account number of the person who acknowledged the alarm The cleared alarms screen shows up to 100 alarms which have occurred but whose conditions are no longer out of bounds The alarms may or may not have been acknowledged The screen is otherwise identical to the Active Alarms screen discussed above and has a detail screen for each alarm just like the Active Alarms screen The Alarm Status screen lists every alarm configured for the SC 255 giving its name type status and alarm conditions AK2 SC 255 Reference Manual 195 Low oil ditt Alarm if below 50 0psi for 15 minutes High oil pressure Dil Press AAL OE Alarm if above 50 0psi for 15 minutes Low il pressure Dil Press AAL 26d Alarm if below 50 0psi for 15 minutes Comp Short ovyele Compressor AAT JE Alarm if above 3 Cycles in 15 minutes High Pressure Disch Fress A OE Alarm if above 50 0psi for 15 minutes RES DN for more The Network Alarms Screen The Network Alarms screen lists the most recent 100
110. e Danfoss manual Degree Master in AKC 55 Systems literature number RS 8B F1 22 or update code number 084R9897 you need to re scan the network so that they are recognized then initialize them This is done from the Degree Master Controls Board amp Points screen From any Configuration Board amp Points Other Controllers screen select the Degree Master Icon and press ENTER This screen appears Our example shows only one circuit but every configured Degree Master circuit will be listed 1lo 14 20028 Moses eee ae EG MASTEE Deg Master Controls ey Wink All Degree Master Mane Addr Circuit AAs O Locate Init Upload Heo e The fields and contents are Name Label field any 15 characters The name of the evaporator being controlled by the Degree Master The default names for the Degree Master circuits automati cally added during configuration of refrigeration are shown and will suffice in many applications They can be edited character by character put the cursor on the field press to change to edit mode then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that space When the name appears as you want it press ENTER Address 0 to 99 Enter an address from 1 to 99 that is unique 60 AK2 SC 255 Reference Manual RS 8D M1 22 Locate Procedure Activating the service pin from the display Initialization Wink VLT and AKD drives B
111. e SC 255 has recognized the override this may take up to fifteen sec onds then the override will take effect A timed override point can be configured with interrupt enabled or disabled When interrupt is enabled operating the switch a second time will terminate the override The green light will blink for up to fifteen seconds until the SC 255 recognizes the switch then the light will go off and the override will end AK2 SC 255 Reference Manual 199 2 9 200 Keyswitch Override for Refrigeration High Temperature Alarms Devt If the override point is timed and does not have interrupt enabled the green light will blink for up to fifteen seconds then remain on and the override will time out as configured If the override point is not timed a second operation of the switch will terminate the override The green light will blink until the SC 255 recognizes the switch then the override will end and the green light will go off Configuration of the keyswitch alarm feature is covered in Chapter 4 5 Configuring Alarms The keyswitch allows store personnel to disable high temperature alarms when cleaning or servicing a case or box The alarms are re enabled after a delay which allows the fixture to reach normal operating temperature by restoring the switch to normal position Using the Audit Trail The SC 255 audit trail is a log that shows each system access together with any changes to configuration or settings that were made
112. e SO_ 0 4 for LSmin High supply temp Supply Air 1 1 odO0O 0 Normal above 50 0 F for 15min HVAC fan dow Fan AHU 1 o0 0 Normal Off for LSmin PG DN for more High zone temp Occurs when zone temperature is above a set temperature 999 9 to 999 9 for a period of from 1 to 9999 seconds minutes or hours Low zone temp Occurs when zone temperature is below a set temperature 999 9 to 999 9 for a period of from 1 to 9999 seconds minutes or hours High humidity Occurs when zone humidity is above a set percentage the field takes values from 999 9 to 999 9 for a period of from 1 to 9999 seconds minutes or hours High supply temp Occurs when supply temperature is above a set temperature 999 9 to 999 9 for a period of from 1 to 9999 seconds minutes or hours HVAC fan down A digital alarm that can be enabled to occur when the system fan is called to run and fails to show proof digital monitor fails to read ON within the time period specified in the alarm 1 9999 seconds minutes or hours HVAC smoke if a smoke detector is configured A digital alarm that can be enabled to occur when a smoke detector reads ON for a specified time period 1 to 9999 seconds minutes or hours HVAC fire if an HVAC fire stat is configured A digital alarm that can be enabled to occur when a fire stat monitor reads on for a specified time period 0 9999 seconds minutes or hours AK2 SC 255 Reference Manual RS 8D M1 22 Devt
113. e board and point from which the sensor value is to be received RS 8D M1 22 AK2 SC 255 Reference Manual 109 1 4 110 AK2 SC 255 lighting Devt Lighting Configuration Lighting configuration starts with selection of Configuration from the Main Menu A simple lighting menu appears as at left below First select Lighting zones from the menu and the screen at right is presented 11 05 2002 Configure Light ingin E No of Zones 30 No af Zones ie No of Powerlink Fanels 25 No of Powerlink Fanels cull No of Cutler Hammer Panels 5 Wo of Cutler Hammer Panels 1 zones share photocells Yes zones share photocells gt No Wumber of photocells 25 Nane Type Name Type 50 Sales AECSS gt eE 50 Sales ARCSS Setup Zone PURLE Setup lt Zone 2 FWELE Setup Zone 3 AECSS Setup lt cone 3 CUTLE gt Setups Zone 4 AECSS Setup lt zone 4 AKCES Setups Zone 5 AECSS Setup lt zone 5 AECSS Betup t zone 6 AECSS Setup lt zone 6 AECSS Setups zone 7 AECSS Setup lt aone 7 AECSS Setups zone 6 AECSS Setup lt zone S AECSS Betup t zone 9 AECSS Setup lt zone 3 AECSS Setup zone 10 AECSS Setup lt zone 10 ARCSS Setup PG DM for more PG DN for more No of Zones 0 to 30 The number of lighting zones to be config ured on this AKC 55 No of Powerlink Panels 0 to 5 The number of Square D Powerlink lighting panels to be configured The SC 255 currently supports both AS and G3 versions of Square D Powerlink pa
114. e controlled O to 100 The photocell level that the controller will seek to maintain by operation of the dimmer 0 to 100 The minimum dimmer level List box Slowest Slow Normal Fast Fastest The relative sensitivity of control to changes in photocell level List box Yes No Whether or not there is an override switch assigned to the zone Time field 00 00 to 23 59 The duration of an override when the override switch is used List box Yes No When this zone s lights are turned off whether they are to be turned on when a moni tored burglar alarm is sensed 0 to 600 When this zone s lights are off and a burglar override is called for the number of minutes delay before the zone is turned on List box Yes No When this zone s lights are turned off whether they are to be turned on when a moni tored fire alarm is sensed There is no pre delay for fire alarms Lighting schedules are found on the next page s Board and points configuration must be completed for all types of points Do this in accordance with the appendix on board amp point configuration Configuration of Powerlink lighting zones configuration is the same as for the SC 255 zones just discussed except that the question Number of control relays is replaced with Number of control points These panels also require board and point setup and initialization see below Configuration of Powerlink lighting zones configuration is the same as for
115. e here The pictured graph shows four sensor inputs suction pressures and suction tempera tures and a variable output the second trace from the top To exit the graph screen press EXIT or click with your mouse in the title bar or gray border above the graph display Let s tour the screen The scale of the graph appears on left edge of the display The scale displayed is governed by the Min and Max settings on the bottom line of the display Min can be any multiple of 10 from 90 to 90 Max can be any multiple of 10 from 80 to 500 The times given at left and right below the graph are the beginning and ending time of the time period for which data is displayed These will change as the number of samples and display rate change The number from 5 to 60 entered in the Sam field specifies the number of samples to appear in the displayed graph Changing the number of samples will also change the time scale under the graph The display interval of the graph Note that the display interval need not be the same as the sampling interval When the display interval is larger not every point will be plotted when the display interval is smaller data will be created to form a smooth path between real measurements Viewing is in one of two modes In realtime mode the history is graphed as it is collected In snapshot mode any of the collected history can be examined The lt AK2 SC 255 Reference Manual 191 Devt and gt
116. e highest and lowest percent of rated maximum speed last line on the screen that the inverter will be allowed to drive the fan motor when cooling is on Min 10 0 to 100 0 Max 50 0 to 130 0 The highest and lowest percent of rated maximum speed last line on the screen that the inverter will be allowed to drive the fan motor when dehumidification is on Min 10 0 to 100 0 Max 50 0 to 130 0 The highest and lowest percent of rated maximum speed last line on the screen that the inverter will be allowed to drive the fan motor when dehumidification is being used for dehumidification 1 to 9999 The rated maximum speed of the fan motor from the data plate 1 to 20 This setting together with the next regulate the sensitivity of speed control These should be left at the default settings and should only changed by a Danfoss trained technician 1 to 15 This setting together with the preceding one regulate the sensitivity of speed control These should be left at the default settings and should only changed by a Danfoss trained technician 0 to 10 The number of reset attempts when proof is not detected before the variable speed drive will be placed in override 0 to 600 The number of seconds that must elapse between resets 0 to 600 The number of seconds that must elapse after proof is not detected before a reset attempt List box Yes No Whether or not phase loss will be monitored List box Yes No Whether or
117. e points of the selected type in the example relay outputs There may be several or many pages of points to choose from for a given type in a particular AKCESS system Selecting points to View To select a point as one of the five to view place the cursor on the word No in the column headed View press the key then use one of the arrow keys to toggle the field to Yes and press ENTER Note that this can only be done if there are not five points already selected and shown in the upper portion of the screen If all five positions in the upper portion of the screen have been selected you must either clear the display configuration by using the Clear button at the bottom of the screen or turn off one or more points first No history is lost by removing a point from the display configuration The five datapoints to be viewed can be any combination of relay outputs sensor inputs on off inputs variable outputs or Smart Case Controller points A list of each type can be seen by selecting the appropriate icon at the bottom of the screen and pressing ENTER Here s how a screen would look with five datapoints two relay outputs and three sensor inputs selected 188 AK2 SC 255 Reference Manual RS 8D M1 22 Displaying History RS 8D M1 22 OFM Sub OFM Sub OFM Sub OFM Sub Not configured 10 10 56 AM Suction Pres AA Suction Pres AB Subcool Trp AAL SuUubcool Tip AAS Sam Units Sensor Inputs O21 Suction Pres
118. e the filter Sensor discard if control based on two or more zone sensors Occurs at the specified time after one of the controlling sensors fails and the control ler logic stops using the value of that sensor The time setting can be from 1 to 9999 seconds minutes or hours NOTE if all zone sensors fail control will be based on the return air sensor Power failure A digital alarm that can be enabled to occur whenever power is restored after being interrupted interrupted the inverter is in bypass for a specified time period 0 9999 seconds minutes or hours ClimaTECH alarm configuration Alarm types for the two ClimaTECH HVAC controllers are the same and all are embedded with a common time delay which you can change except the fire stat alarm the fire stat is wired to an AKC 55 digital input board not to the ClimaTECH controller it is broadcast to the ClimaTECH over the AKC 55 s I O network The alarm configuration screen for a ClimaTECH controller is shown below RS 8D M1 22 AK2 SC 255 Reference Manual 137 138 Configuring Miscellaneous alarms a re ee Type Alarm Ae Ler cic cS ee ieee ed T 15 win High zone temp Mormal above 85 0 F Low zone temp Wormal below 40 0 F No Airflow Normal Phase Loss Normal Inverter failure Normal Fire Mormatl AFC 55 Inputs HVAC fire Fire Stat 00 0 Normal On for LSmin Notice the common alarm delay at the top of the screen It can be set to any number from 0 to 100 The
119. eadband Min sat cond temp Min subcooling temp Elevation rack to cond Open SPR if discharge Bleed valve Delay after SPR Dave List box Yes No Whether or not an Enviroguard system is being used 0 0 to 100 0 The desired number of degrees of subcooling 0 0 to 100 0 The deadband above the target and below the target in which there will be no control actions 0 0 to 100 0 The saturated condensing temperatuare below which the system pressure regulator will be off 99 9 to 99 9 The subcooling temperature below which the system pressure regulator will be off O to 3000 The total drop distance from condenser to the rack 0 0 to 200 0 The pressure differential above target at which the system pressure regulator will open List box Yes No Whether or not there is a bleed valve 0 to 10 The number of minutes that must elapse after the system pressure regulator is turned on before the bleed relay is energized Evaporative condensers Returning to the first page of condenser configuration from the Main Menu Configu ration Refrigeration select the rack Condensers Select Evaporative for the condenser type The screen will appear as shown below Condenser Gye 5 2 sss TEvaporative No sto punps s se oe eee Tz Day Borat erie eso 2 2 seca TYes Monitor stages n Hone Control SsenSs0E aaan TPressure Monitor dropleg temp Yes Control method qTarget Target control type T Pamp stage
120. economizer configuration Donfesi answer here means that only heat reclaim can be used for reheating during dehumidification l1 rlSrz0 z HS Configure CT ETU 5 ged a aie is Beal 8 alee ee meee dis os ere ease a Yes Qutside ambient target 0 0 AE Qutside dewpoint target 0 0 F Economizer Outside ambient target Outside dewpoint target 104 AK2 SC 255 Reference Manual List box Yes No Whether or not there is an econo mizer function in the HVAC unit 40 0 to 150 0 The target The number of stages of auxiliary heat in the HVAC unit 0 0 to 150 0 The heat reclaim setpoint during store closed hours as configured in the Store Info screen RS 8D M1 22 Davee ClimaTECH alarm configuration ClimaTECH alarms are presented differently than most other alarms 10 15 2002 Type alarm del 22s oa SG ye aoe 15 min High zone temp Wormal above 85 0 F Low zone temp Normal below 40 0 F No Airflow Normal Phase Loss Critical Inverter failure Fire AEC 55 Inputs HVAC fire Fire Stat 00 0 Normal r for lSmin Alarm delay 0 to 100 The number of minutes after an input reaches trip level that an alarm will be generated All ClimaTECH alarms have a common alarm delay Each alarm has a setting Normal Critical etc as explained in the Alarms appendix A trip level a temperature pressure etc or on off state can be set for each alarm ClimaTECH schedule configuration Because the ClimaTECH can
121. ed time period 1 9999 seconds minutes or hours High oil resets if an oil reset switch monitor is configured A cycle digital alarm with the trip level a number of cycles in a specified time period 1 9999 seconds minutes or hours High Temperature if a discharge temperature sensor is configured An analog alarm set for a temperature from 999 9 to 999 9 degrees with a time limit from 1 to 9999 seconds minutes or hours High inverter resets if variable speed is configured and the reset is moni tored A cycle digital alarm with the trip level a number of cycles 0 9 in a specified time period 1 9999 seconds minutes or hours Inverter failure if variable speed is configured and the inverter bypass is monitored A digital alarm that can be enabled to occur when the inverter is in bypass for a specified time period 0 9999 seconds minutes or hours The third selection on the rack alarm configuration menu is Circuits The types of alarms that present themselves depend upon whether the circuit is directly controlled by SC 255 I O or by one of the various types of Danfoss case controllers After selecting Circuits from the rack alarms menu shown once again at left you will be presented with a list of configured evaporator circuits which will vary greatly de pending on what circuits you have configured A list of typical circuits is shown at right AK2 SC 255 Reference Manual 129 130 Alarms for AK2 SC 255 circuits
122. ee tc nec anes taco S ton se aeaee ene tune E 34 46 PAE ONC OMS 1S OPS E S A A TEE A A 35 42 SP condenser CONLION seais E E E E 39 40 RSAC OM ZO Me a URIS e a EN E IE TA E E E EEE 40 EA E Sy E E A E N EEE A A O E corsa estceegseen ces 41 42 BV AOA YS Cd e E 42 47 Pump louver and sump schedules nic evsotazsnsscntceesctbsesaccwaededce sins wansineessuebouesseaandaedsaenesadeensandnesets 44 45 Inv rter settings freeze protection dump VAY 6 sessirnir a 45 46 Dimps Godi pasta a E E A E E EE A E 46 47 Pocero conii ON esa sce veoatancesgssoaessassusaasawensasauevacsanatacaiseactactomsosapeamaesscnoaguiokeasgatencseanereeen 47 Hea Se FAN CAN 11 A ON pease rated seen E E S E E 47 49 Remigeraiondlarmis CO La GON rsce se txeate cect noesdace stench T 49 50 Boardi Pont Coni Al ON aggre e E E ANE E E 50 Navion a E Nenaatnateacanaeoseesaecttasastenteseteveanaacenteet 51 Board amp Points relay outputs digital outputs ocscceceseccecesesadetdssienssantavansaceaassbeeandacatadanebesbonwsadeasseee 51 52 Board amp Points sensor inputs analog inputs vaccessaxirennsncnouasenweesaseueedesnadecauecatectaunitelcenteedoeswsusenstices 52 54 Board amp Points on off inputs digital inputs sis ccaasaeccesececwasesaienueseansveaetiaoeasiacemmsdicdaedineusbesieassesiear 54 55 4 AK2 SC 255 Reference Manual RS 8D M1 22 1 3 RS 8D M1 22 Board amp Points variable outputs analog outputs sesicvesescinavsncecawcnuseveraessnsrorucivseaivas
123. een that will appear Authorization Yiew Only Auth Log Out Account Audit Trail Audit Authorization Organ Lvl 00125 00068 02725705 O9 444 Keypad 1 01 OOO6Y OO068 O2 24 05 12 41P Keypad 1 01 OOO066 O0O043 02724 705 10 284 Keypad 1 01 00042 00042 02724705 10 284 Keypad 1 01 OO041 O0001 02723705 09 504 Keypad 1 01 Notice that the current level of access probably View only will be seen at the top of the screen The cursor will be in the Auth field To become authorized at a higher level enter your Auth code given to you by the system owner press ENTER the cursor moves to the Account field enter your Account code press ENTER If you have correctly entered a valid code and account number the bar at the very bottom of the display will read Access accepted in reverse video You are now authorized at the level that appears in the screen title area After several minutes of inactivity the access level will revert to view only If you want to log off and immediately prevent access by others without authorization go to the Authorization screen put the cursor on the lt Log Out gt button and press ENTER AK2 SC 255 Reference Manual RS 8D M1 22 Selection of Units and Language Devt The authorization level will revert to View Only To assign authorization codes and account numbers you must be at the supervisor level Use the procedures found in section I Before using the system you may wish to change
124. em Log BS232 Log EI The Host Network screen shows the address of the current 255 the number on the network and the status Online or Offline of each Our example below shows oOnly one 255 on the network but there may be more in the system you are working with Host Communication Type gt E3455 This S amp He sCl255 Sddress OO BRE SCZSES5 s an network L I o 1 J Sddress Status 0 Online HABEEE SE A The I O Network Status menu looks like this AK2 SC 255 Reference Manual RS 8D M1 22 List Points RS 8D M1 22 ES If 0 Network Status ES If 0 Network Status ES List FPoaints ES List Hodes The network rescan operation may take a few minutes ist Points aa E n iw Eescan Netmork ES Owerwiem Proceed press hey 1 2 or 3 Complete rescan Find new modes Cancel scan BRescan Hetwork BREE EEE GE BERBER E GE The Rescan Network button is used when nodes have been added to the network or re addressed Until the network is rescanned the new configuration will not be recognized After using the rescan button the screen at right above appears Select List Points from the I O Network Status Screen and this is the screen that appears Os 02 2005 Alarm 01 25 03 FH Bd Pr Nane Talue Status ile Compressor AAL On Offline ol Unloader Ala off Offline WALSE Unloader Alb off Offline l 4 Unloader Alc off Offline ils Unloader Ald off Offline o1 6 Oil Reser AAL off Offline i In
125. ence Manual 173 Danfesi form Normal Refrigeration to Cleaning Shutdown the status of the lights fans and anti sweat heaters is automatically changed so that lights and fans are kept on and anti sweats are kept off until the fixture is returned to the normal refrigeration mode 2 4 Using the Refrigeration Screens for Refrigeration Circuits Controlled directly from AK2 SC 255 s 174 Evaporator Status Screen The status screens for refrigeration circuits controlled directly from SC 255 s contain different information than those for circuits with Smart Case Controllers The status screen for an SC 255 circuit is reached from the main menu by selecting Refrigeration then the Rack then Evaporators then the evaporator Here s the status screen for an SC 255 circuit o3 04 7005 Status Thermostat Cuttin HC Meat A441 25 3 F Target z 4 0 F Fange Oa 1 Defrost Temp z 31 4 F o F Termination SO Dewpoint 44_5 F Gas Valwe offt 4Antleweat On Fan z rn PR DN for more Bee Ree oA The status of the circuit is given in the first line Possible contents are Thermostat Cutin The circuit is being refrigerated Refrigeration is on because the discharge air temperature reached target temperature plus the temperature range Thermostat Cutout Refrigeration is off because the discharge air tem perature has reached target temperature minus the temperature range Terminated Defrost Defros
126. end or both and you are getting a large number of false alarms make sure the system is operating safely for the product and equipment then extend the alarm range gradually If you don t ever get any false alarms the alarm parameters are probably too loose Remember that more or less temporary factors such as overloading service and cleaning can cause alarms to occur Be careful to investigate any suspicious alarm that occurs when causative activities are going on in the store FAQ 2 Can you be more specific and perhaps give thumb rules for alarm settings OK let s assume that this particular rack is set for a target of 14 psi and 1s operating to your satisfaction with that setting Typically we find that adding 10 psi to the target and setting the trip level for high suction pressure at 24 psi for 30 minutes is a good starting setting If the suction pressure is more than 10 psi above target for a half hour we should suspect that something is keeping the rack from making target pressure One possible cause is an off line compressor For the low suction pressure alarm first look at the cut out setpoint that has been configured for the rack With a target of 14 psi perhaps the cut out is set at 2 or 3 If AK2 SC 255 Reference Manual 127 Danfesi this is so then a good setting for the low suction pressure alarm might be at the cut out for 10 to 15 minutes Types of suction alarms listed The alarm types depend to some e
127. eneral If there are no calculations configured when you select Calculations from the Config ure Miscellaneous menu the seemingly unassuming screen below at left appears when one or more calculated points have been configured the screen is a list screen as at right below 04 58 16 PH O8 2002 11 0501 CFG Configure Calculations Confiqure Calculations Point Description Value Status Point Description Value Status OL Online Ca OZ SI ppm 1 0ppm Error New Calc Mew Calc Ca O3 Every configured calculated point will be listed The fields are as follows Point Ca 01 to Ca 96 The name of the calculated point Description The type of point OI or SI If an SI the description will usually include the units Value The current value or state of the point This will be on or off for OI points and a value for SI points Status Online Offline Error New Calc At the bottom left of the screen is a field with the RS 8D M1 22 AK2 SC 255 Reference Manual 143 144 Point creation Danfesi number of the next unconfigured calculated point To configure a new point select this field and press ENTER When you press ENTER with the cursor on the name of the next new calculated point the configuration screen for that point opens and looks like this fO8 2002 11 07 44 4M tlerror Aeren Current Value f Errori 7 On The list box for the Units field is already open when the screen first disp
128. ennianeetaunn 127 W E E e E E A A E reer rte 127 PS Omi Fite quietly Asked Questions sessie en n de sees EE EE T 127 128 Types Cl uchionmal mrmis SECC eee A 128 COmMmpressor Alaris gece 2 eoaeceespcreesasbevanaupasde ie RE e E na ea O RE aas a ae aai Ten 128 129 Sareung AN a E E E I E E E E E S E T E 129 132 APZ O a E E a E A E A E A A S 130 131 PNG MAC CU 1S cocacte ccesceactiaca conse E E 131 132 AK2 SC 255 Reference Manual RS 8D M1 22 Devt 1 6 Configuring Alarms CONTINUE cccceeeeeseeeeeeesneeeeeeenseeeeeoenseeeseoenseeeseoenneees 121 132 EKCK DCU and Decree Master CI CUO a rcercacstcqeriacossesteccee snes vecnnle veer tereaenc nea nieecseeaee veel meade 132 AKC TGS SOC OO INS CCU Susic 132 G0 06 SJ cto ners Fig 0 amen E enn Peer ne nee E Tere eee ee eee 133 AHE T a o A E E E E SA E 134 Connounne Bizertack alarms are ene nen narn EE E N 134 135 HVAC COM OE ATIOM goctiesntseasentoncannnactesocenesseciduee satus esnaacsas snes cmeaneieaiacceutecteeutasseietalgestesatateniees 135 138 PTA TR A SO BINS esac carte cag 4c eats acento nv eens enc anda naoiawsanaes 136 PECS me re ee E eee Te 137 Tira CT AAG esc escncp aes stem E E A N A E E 137 138 IVS CON AMIC OUS GIANG assctssatasencesatennnectonussetosenasasseusandoneasaidaanaahenemnnesesioassecnnesdsevsoatcanasdettoeaneteremesneteces 138 140 Example TSC e AMOS alarmi tc cqschaasocaneetcnsteisassacuascuseeevonddsahacstachencusmveaceayeieastetbugsanusaeeene
129. eoeoseseeteeeesseressssssssssssssssssscesseeeereessersessssss 95 96 Heating configuration Seasons 4 Smart Coil s ssiccncsicntmnoot veces cpoussdsarvaidanesaaniaumemmencuccaatonssoboutasattes 96 97 Dehumidification configuration Seasons 4 Smart Coll cccccccseeccccceceeeeeeeeeeeeeeeeaaaeaaaaeeseseeeeees 98 99 Condenser configuration Seasons 4 Smart Coil sacsssssmerscsisetcostouicsessrsieornarcesassauces sea cacmuestomebaleruevieies 99 Alarms configuration Seasons 4 Smart Coil snesseeccorcetersue strani vesenacusvaanceneeincewheremesentioviateanoaatantaeioneene 99 AK2 SC 255 Reference Manual 5 Board amp points configuration Seasons 4 Smart Coil cccscice scravsesairavsaciasccessivassaseetioeaesdisasslaveeaiivaciaeus scons 99 na Ws le Reve sia U Oe E E ttn trees venue nee ee rene ne er 100 109 Fomec Olio ieanton Cuma TEOT ac cesssaansccesacpuccsass suse scen cosasassoasacnses sonsaseatevconsteataoneactaeaeecaesseeanees 100 101 Cooling configuration ClimaTECH Reaumneeeneeam cnr ener ny retry erm mann enter athe tent en nen ny or net 101 102 Heatneconnguration Cia CA seseris EE SE 102 103 Dehumidification configuration ClimaTECH aastesccosectctgtaseesdencoxtawuassseevncensevewiacnucetonjesassuontsneewal 103 104 Economizer configuration ClimaTECH iccccacncciorstatensntuscisevsiwioantsdatatunienaedtanertontoosuonteieeeesianieeataiauneuets 104 Alarmconfiguration Chima TECH 5 ss a steaetenca ut soetrne Season taccdawatbelneataa
130. eosieaw 139 140 Number ARTS TCU eects tessa pasa oss E E E E 140 1 7 Miscellaneous Points Configuration ccccscsccssesseeseesseeeesseeseesseeseesneeseenseesoeneees 140 154 DOP PN COMPO UT AMON ghete se scteeauesereeussnsncinensbanneaauteneqatmeneecenoiueasesetes save e a n aiaeei 141 Pns OY OE e E 141 Miscellanous relay OUT UILS seriene E E 141 142 IMIS Ce HAN OUSSE MSOF APLS err A 142 Miscellaneous on off PUTS sranani a rand iae a sus ayant andla nc Ea a aa 142 Speciiy mne TMISEE HOME OUS conversis i cca crcaccarechaatccanszieredeavesecdacebusdiavaaesteatcartantanednacaresensste eossseeencaams 142 143 MISC CIEE OMS CAC UA ONS eo a E E A E E E rss eetesaacicetene lee 143 144 POMUDCECAMOM e A A A asealaansaaaiweametintmsanctiess 144 145 Casom SEAS 8 y EX apie ocr ER E de 145 153 Creating the miscellaneous points Sensor inputs cc eeeeeeseeeeeesseeseseseeeeeeececeeeeeeeeeeeeeeeaaaaaas 145 146 Winne ie CUSTOMISE ECO see E A E E E vee beaeaeaneees 146 Faia Ce MON eea E uaa eictsce tosmaaeseeses 146 148 ACCS ACA aes ecto tc ede ania scene E E E eg avec aee seagate nea E E ease eee 148 149 NV MEO TMCS pere a E T E E E E 149 150 Creating the miscellaneous points relay output ssssssssssssssssseseessetttereeeseessnsssssssssssssssseeeeeerereee 151 154 CONTIGUEING AUIMOLIZAtOMN sce eceestscecwsccenasuscossreecdetensnsnnetacecnscceessasvetnndasdaweeseaseatesensuaaneveusscieucustuaws 154 Configuri
131. equipment owner ES Configure 4 Unit 4 Number of fans Hinimum Fun timme 72 mirn Liquid Temp Setpoint Stage Stage Stage Range I 2 3s 60 0 F 75 0 F 90 0 F 1 0 F Number of fans Minimum run time Liquid Temp Setpoint Range List box None Six Eight The number of HVAC condenser fans controlled in this unit 0 to 60 The number of minutes that a stage must run before being turned off 0 0 to 150 0 one setpoint per stage The stage will be turned on at setpoint plus range and turned off after the stage above is turned off at setpoint minus range 0 0 to 150 0 one setpoint per stage The stage will be turned on at setpoint plus range and turned off after the stage above is turned off at setpoint minus range SC4 alarms are configured as are RTU alarms SC4 board amp points are configured as are RTU board amp points AK2 SC 255 Reference Manual 99 Devt ClimaTECH configuration Danfoss supplies two models of ClimaTECH HVAC controller the ClimaTECH 65 and the ClimaTECH 1024 Configuration of these two controllers proceeds in the same way The ClimaTECH 1024 has a larger control capacity The ClimaTECH configuration menu appears below 10 18 2002 09 10 10 4M E Configure Unit 6 Economizer i Cooling i Alarms Schedule Ra Heating R Dehumidi fy i Board Points M There are two fan configuration screens depending on whether the fan is
132. er On or Off You can change the mode of any single relay by toggling the mode field use the key or your right mouse button then using the arrow keys to select either Auto Manual On or Manual Off Finally use press ENTER or use your left mouse button to save your change The Reset button at the bottom center of the screen can be used to restore all the relay outputs to Auto A sensor can be given an override value by entering an offset in its service screen The RO8S board is a relay output board with override switches The board provides 8 relay outputs for control of a variety of loads An override switch and two LED s are mounted on the board for each relay output Installation of the RO8S board is covered in section III 3 of this manual As with RO8 boards each output has nor mally open normally closed and common terminals Each output has a pair of LED s one red and one green The red LED lights whenever its relay output is overridden The green LED lights whenever the relay coil is energized The possible combinations and their meanings are shown in the following table a vas Override Relay Coil GREEN Condition Condition n Manager s Override Box Interrupting the Override RS 8D M1 22 Configuration Manager s Override Box is covered in Chapter 4 8 Configuring Store Information To activate override of a point operate the switch for that point The green light will blink until th
133. er of alarms embedded in the case controller that are received and processed by the SC 255 The alarms are enabled and disabled through the SC 255 and if enabled will be dialed out by the SC 255 when they occur The alarm configuration screen for an AKC 164 circuit looks like this AK2 SC 255 Reference Manual 131 132 Alarms for EKC DCU Degree Master Case Type AKC 164 Temp O 0 F Low case temp High case temp Disabled Low Superheat Disabled Defrost exceeded Disabled Fan start timeout Disabled Drip pan clogged Disabled Box door open Disabled Power failure Disabled Hardware failure Disabled Sensor fail alarms Disabled Eey switch override Mo Send to controlle The embedded alarms and their meanings are as follows Low Superheat Occurs when the difference between the inlet liquid in and outlet gas out tempera tures sensors is too low This could be caused by the evaporator being overfilled with liquid refrigerant In response to this condition the AKC 164 will tend to close the AKV electronic expansion valve Defrost exceeded Occurs if an evaporator is configured to terminate defrost at a set temperature if the termination temperature was not reached before the specified time expired Fan start timeout Occurs when the fan is configured to start at a specified temperature after termina tion of defrost and the specified temperature is not reached before the time set for fan delay expires Drip pan clog
134. erter proof delay 600 sec High pressure bypass 7275 0psi Freeze Protection TYes Freeze prot temp cutout 99 9 F Freeze prot temp cutin 99 9 F Dunp vale eee ne pg ere eee TYes Dump on schedule TYes Moan of dump fchedules 74 Dump on freeze protect Ma Ovweride pump on fra protMo Water flow monitor_ _ tHo PG DN for more Fan inverter control Please see notes on Neutral Zone selection in the first evaporative condenser configuration screen List box None No variable speed drive is controlled VO An analog output also known as a VO variable output point on a Danfoss I O module will control the variable speed drive VLT A Danfoss VLT or AKD variable frequency drive will be used for motor control These devices are AK2 SC 255 Reference Manual 45 46 Dump schedules Min speed Max speed RPM at max speed Inverter max resets Inverter reset delay Inverter proof delay High pressure bypass Freeze Protection Freeze prot temp cutout Freeze prot temp cutin Dump Valve Dump on schedule Num of dump schedules Dump on freeze protect Overide pump on frz prot Water flow monitor Davee connected by means of a 2 wire TP 78 LonWorks card 1 0 to 150 0 The minimum percentage of the maxi mum RPM that the fan motors will be run Insure that the entries on this screen are within the manufacturer s specifications 1 0 to 150 0 The maximum percenta
135. es are erased beginning with the highest numbered schedule until only the number you have entered remains To change the time for a schedule s start or stop place the cursor on the field To change the time of day toggle to edit mode and key in the new time from the keypad To change from AM to PM after entering the new time of day open AM PM list box and select the one you want When the entry reads as you want it press ENTER to save the new time and to restore the arrow keys to their navigation mode AK2 SC 255 Reference Manual 163 Changing the days of the week and holidays Changing label fields 164 Dave To select the active days of the week for the schedule put the cursor on the field then press the EDIT key Now the left and right arrow keys move you back and forth through the weekdays and the up and down arrow keys toggle the individual days on and off When you have finished selecting the weekdays press ENTER which saves your change and restores the function of the arrow keys to their naviga tion mode The holidays for which the schedule is active are selected in the same manner A label field is one in which you can use alphabetic characters and certain symbols to create a name or a message To see an example of such a field and describe how to change it we will go back to the Main Menu and select Store Info then Holidays Changing names was covered in Chapter 5 7 but we ll repeat the information here
136. f entries displayed on the current page RS 8D M1 22 AK2 SC 255 Reference Manual 201 Danfesi gt an operator that moves the screen one entry back ward in time gt gt an operator that moves the screen one page back ward in time 00001 shows the oldest entry in the audit trail database When the database is filled to capacity the next entry will cause the oldest to be deleted so this number can be other than 00001 202 AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 AK2 SC 255 Reference Manual 203 204 AK2 SC 255 Reference Manual RS 8D M1 22 Danfoss Refrigeration amp Air Conditioning Division 7941 Corporate Drive Baltimore MD 21236 Tel 410 931 8250 Fax 410 931 8256 Direct Order Fax 410 931 0677 www acr danfoss com Danfoss can accept no responsibility for possible errors in catalogues brochures and other printed material Danfoss reserves the right to alter its products without notice This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed All trademarks in this material are property of the respective companies Danfoss and the Danfoss logotype are trademarks of Danfoss A S All rights reserved Danfoss 2005 RS 8D M1 22
137. field and press enter A popup box will appear on the screen instructing you to press the service pin on the breaker panel You will have a few minutes to do this Successful location will be indicated by a message in the bar at the bottom of the screen Cutler Hammer panels do not require the locate procedure 1 5 Energy Meter Configuration 114 Installation An AK2 SC 255 system can monitor Danfoss approved energy meters which have an Echelon interface Each AKC 55 can monitor up to five meters Each current source must have a dedicated meter After installing the energy meter and current transformers according to instructions provided by their manufacturer the meter is connected to the I O network and becomes a node on the network after configuration Only one of the meters con nected to an SC 255 can be used for demand limiting AK2 SC 255 Reference Manual RS 8D M1 22 Configuration RS 8D M1 22 Devt To begin configuration of utility meters select Energy from the main menu and press ENTER The Energy Menu appears as at left below Select Utility Meter and press ENTER and the Utility Meter Menu appears as at right below 11 o07 2002 Utility Meter HS Configure Meter History Continuing select Configure from the Utility Meter Menu and press ENTER Now the Utility Meter Configuration menu appears as shown below 11 06 2002 Javea Configaratiorn Wo of KWH Utility Meters E Nane Meter 1 gt
138. for this group will read Low Temp AB PSIG target 50 0 to 500 0 The pressure that the controller will maintain subject to capabilities of mechanical equip AK2 SC 255 Reference Manual 17 PSIG Safety cutout Adaptive suction control Bd Pt Temp target Range Maximum pressure float Post defrost delay Allow float below target Night setback Setback from time Setback to time Setback days Donfsi ment for this suction group 50 0 to 150 0 The gauge pressure at which the controller will stop the compressors in this suction group List box None No adaptive suction control AK2 SC 255 Target pressure is adjusted based on discharge temperature of a single fixture AKC 16x Adaptive control of individual evaporators by an AKC 164 or AKC 161 Smart Case Controller Sensor Target pressure is adjusted based on any sensor on the AKC 55 I O network Dynamic The SC 255 analyzes the performance of every case on each individual circuit and adjusts target pressure intelligently by using the case sensor that varies most from the setpoint For the first group to the left of the hyphen 01 to 99 for the second group to the right of the hyphen 1 to 8 The board and point address of the fixture sensor used by the adaptive control algorithm Does not appear when dynamic adaptive control is selected Note that board and point numbers use a different format with AK2 modules See the AK2 I O user manual for m
139. frost time is reached The defrost setting will then return to Auto Manual Off The function will remain off until the mode is changed in this service screen Manual On Time Defrost Only Defrost will remain on for the Maxi mum Time specified in this screen regardless of the defrost temperature Associated with the defrost field is a field for Maxi mum Time which is the maximum time a system can remain in defrost whether or not a selected termina tion temperature has been reached There are two fields which control the mode of the fixture s refrigeration valve Valve The valve mode either Manual or Auto If manual the valve will remain at the percentage specified on the following line To turn off refrigeration select Manual and enter 0 as the manual valve percent age Manual Value For AKV electronic expansion valves the percent age 0 100 of valve opening which will be held while the valve is in Manual mode Evaporator Service AKC 16x Shutdown Smart Case Controllers The Smart Case Controller Shutdown screen allows one or more fixtures on a rack to be shut down The anti sweat heaters lights and fans can be put in an override status from the screen also Evaporator service Case Cleaning Smart Case Controllers The Case Cleaning screen for Smart Case Controllers offers a quick way to shut down individual fixtures for cleaning When the Case Cleaning status is changed RS 8D M1 22 AK2 SC 255 Refer
140. g configured for dehumidification will be disallowed List box Yes No Whether or not there is to be a lockout based on low ambient temperature 0 0 to 100 0 The ambient temperature below which dehumidification will be locked out 0 0 to 9 9 The range for the lockout Dehumidifica tion will be locked out at lockout minus range and when locked out will be allowed on at lockout plus range 0 to 20 The number of minutes that a stage must run before being turned off 0 to 20 The number of minutes that must elapse after a stage is turned on before the next stage can be turned on List box Yes No Whether or not the dehumidifica tion setpoint is to be raised by an offset next line when dehumidification is not scheduled to be on according to a schedule or schedules next page 0 to 99 The number of by which the dehumidifica tion setpoint is to be raised during night setback RS 8D M1 22 SC4condenser configuration SC4 alarms configuration SC4 board amp points configuration RS 8D M1 22 Override switch Override duration Num of schedules Seasons 4 password Devt List box Yes No Whether or not there is an over ride switch wired to a digital input 0 to 1439 The number of minutes that control will be overridden after operation of the override switch 0 to 8 The number of operating schedules entered on the following page s 5 character auth code The password given by Seasons 4 to the
141. g eee erect ee ears TYes Monitor inlet temp fres PR DN for more Pump cutin Pump cutout 0 0 to 500 0 The pressure at which the pump will be turned on 0 0 to 500 0 The pressure at which the pump will be turned off 44 AK2 SC 255 Reference Manual RS 8D M1 22 Inverter settings Freeze protection Dump valve RS 8D M1 22 Louver control enabled Louver cutin Louver cutout Enable sump control Sump level empty Sump level full Sump level top off Fill valve Monitor inlet temp Devt List box Yes No Whether or not louvers are to be controlled 0 0 to 500 0 The pressure at which louvers will be opened 0 0 to 500 0 The pressure at which louvers will be closed List box Yes No Whether or not the sump is controlled 0 0 to 100 0 The percentage of fill at which the sump is considered empty 0 0 to 100 0 The percentage of fill at which the sump is considered full 0 0 to 100 0 Requires fill valve control The percentage of fill at which the fill valve will open and top off will begin List box Yes No Whether or not the sump fill valve is controlled List box Yes No Whether or not the inlet tempera ture is monitored The next page deals with inverter settings if the condenser fans are variable speed and with freeze protection and dump valve operation 10 10 2002 BPM at max speed T6000 Max 2 CE SSeS 2st ee eee 710 Inverter reset delay 600 sec Inv
142. g switch you must wire and configure an on off input for the coupling switch You may wish to read the section How demand limiting works that follows the section Lighting demand limiting before you start configuration Now return to the Energy menu one good way is to return to the Main Menu menu key select Energy then select Demand Limiting From the Demand Limiting menu select Configure These two screens look like this 11 07 2002 E Board Points Utility Meter ES Conftiqure When you put the cursor on Configure the second page of the Demand Limiting Menu appears as at left below offering two choices Select Units for HVAC and Select Zones for lighting Choose Select Units and the screen at right below AK2 SC 255 Reference Manual 119 120 Lighting demand limiting How demand limiting works appears and you can begin configuring HVAC demand limiting beis screen appears 11 07 2002 Emergency Unit Level Level Bakery 5o Z 1 Main AHU 4 10 10 Office 5 3 1 Select Units S4 Unit 4 6 zZ 1 HomedcGard n 7 5 3 Select zones Umit 6 5 ll ll The fields on the demand configuration screen for HVAC right are Name first column The name of the unit as it was assigned during configu ration Every configured HVAC unit will be listed Unit The address of the SC 255 which has the demand meter that will be used for demand limiting This can be any SC 255 in the network
143. ge in a Standard Alarm System alarms Board amp Points configuration Danfesi Critical When conditions have been at or have gone beyond the alarm s trip level for the set time the alarm will occur The alarm will dial out repeatedly at the interval set in the routing screen from 10 to 99 minutes with a default value of 10 minutes Normal When conditions have been at or have or have gone beyond the alarm s trip level for the set time the alarm will occur The alarm will dial out once Log Only When conditions have been at or have gone beyond the alarm s trip level for the set time the alarm will occur There will be no dialout but the occurrence will be logged in the system as an active alarm Disabled The alarm is deactivated and will not occur or dial out its configuration if any will remain in memory so that if it is set to Critical Normal or Log Only the same trip level and time will appear in the screen Delete The alarm s configuration will be deleted from memory You can change the alarm action setting by selecting the field and scrolling to the action you want move the cursor to the field then press the key then use the arrow keys to scroll through the settings then press ENTER Standard alarms are the alarms that are automatically created during configuration of refrigeration HVAC and other parts of the control and monitoring network You can also custom configure up to three miscellaneo
144. ge of the maximum RPM that the fan motors will be run Insure that the entries on this screen are within the manufacturer s specifications 1 to 6000 The number of RPM at the maximum speed specified in the preceding setting 10 to 10 The maximum number of inverter resets after which a subsequent reset condition will place the inverter in override 1 to 600 The number of seconds that must elapse between inverter reset attempts 1 to 600 The number of seconds without proof before an inverter reset is attempted 0 0 to 500 0 The pressure at and above which all fans will be run and at full speed if variable speed motor control is used When high pressure bypass occurs a service technician is required to clear the bypass by using the appropriate button in the status screen List box Yes No Whether or not freeze protection control is implemented 99 0 to 99 9 The outside ambient temperature at and below which evaporative cooling will be locked out 99 0 to 99 9 The outside ambient temperature at and above which evaporative cooling will be allowed to run List box Yes No Whether or not a dump valve is controlled List box Yes No Whether or not the dump valve will be controlled by a schedule to be entered on the following page s 1 to 8 The number of effective dump schedules to be entered on the following page s List box Yes No Whether or not the dump valve will be activated at the freeze prote
145. ged Occurs when a clogged drain is sensed due to standing water in the fixture drip pan Box door open a door switch must be installed and connected to the AKC 164 for this alarm Occurs when the box door is open past the specified delay time Power failure Occurs when the AKC 164 resumes operation following interruption of power Hardware failure Occurs upon detection of one or more internal AKC 164 hardware failures Replace ment of the AKC 164 may be necessary Sensor fail alarms Occur when the AKC 164 detects failure of one or more of its sensors and AKC 165 Subcooling controllers Configuration of alarms for these controllers is not covered in this manual but in the separate literature for the individual controllers AK2 SC 255 Reference Manual RS 8D M1 22 Configuration of condenser alarms RS 8D M1 22 Devt The fourth selection on the rack alarm configuration menu is Condensers Before configuring condenser alarms if you are implementing condenser control finish answering the condenser configuration questions Depending on the type of condenser configuration the alarms presented will differ For the most part the alarms presented in this section will be similar to those already covered in the preceding sections on suction and compressor alarms We have configured condenser control including variable speed so as to describe almost all the alarm types After selecting Condensers from the rack alarms menu show
146. ght below For this very unlikely store we have configured one unit of every type ee ee Jf Alarm Configuration Refrigeration B Bouting HVAC Phone Numbers E Miscellaneous A IF Network Syst ei A Printer Ft eryvice odem id 5 Mod The unit types listed are as follows AHU RTU RTC AK2 SC 255 Reference Manual ETU Unit BIC Unit BIC Unit CT 65 Unit CT lO 4 Unit I z 3 4 5 6 Air handling unit A built up system Rooftop unit A packaged rooftop unit Rooftop controller Any HVAC system controlled by a Danfoss networked or standalone RTC board 135 136 AHU RTU and SC4 alarms Desf SC4 Smart Coil Seasons4 unit CT65 ClimaTECH 65 HVAC controller CT1024 ClimaTECH 1024 controller Carrier Carrier Centurion or Premier Link unit We will review each of the alarm types for AHU RTU and SC4 systems which have almost identical alarm sets Then we will discuss the alarms that appear only for RTC and ClimaTECH systems These are typical alarms screens None of the default parameters have been changed In an actual store you would probably adjust them O4 lo 2003 11 46 11 4M Type Nane Address Type Nane Address High zone temp zone Temp l 1 00 0 HVAC smoke Smoke Stat 1 00 0 Normal above 50 0 F for 15min Normal On for BE Low zone tenp zone Temp l 1 00 0 HVAC fire Fire Stat 00 0 Normal below 50 0 F for 15min Normal On for 15min High humidity Inside Humidity 20 1 Normal abov
147. he MENU key select Configuration Refrigeration the particular rack and Evaporators The evaporator menu will initially look like as on the left below with no evaporators listed but as soon as you enter a number in answer to the top question and select from the Type list box for some of the evaporators the screen will look something like the one at right D izas eos 10 04 55 AM E Evaporators Wumber of Cireuits 7 40 Dewpoint mwethod T Was Number of Circuits o Dewpoint sensor to use Dewpoint 1 Dewpoint method Dewpoint Auta defrost schedules Disabled Dewpoint sensor to uset Dewpoint 1 Subcooler Al ARZ SC255 Circuit Aiz AEZ S5CZ55 Circuit AAS AEC 16x Circuit As d EEC Circuit AAS Deg Master Circuit As LCU Circuit AA eee oo Circuit AAS AEZ 5SCZ55 Circuit Aag Ake SEEDS Circuit l AEKEZ S5CZ55 ani PG DN for more There are six kinds of evaporator control shown In this manual we will discuss the configuration of SC 255 circuits and AKC 16x circuits For the other types of evapo rators please see the manuals on the individual controllers In the future when a Danfoss Case Control manual is created we will remove the AKC 16x material from this manual First the changeable fields in the Evaporator Menu shown above on the right are as follows Number of circuits 1 to 40 The number of circuits in the suction group Dewpoint method List box Dewpoint A dewpoint sensor or sen
148. hed Enable coupling switch Demand limiting only List box Yes No In installa tions where there are two transformers and or two emergency generators a coupling switch can be used to connect both loads to one source in case the other source fails Number of normal steps Demand limiting only 0 to 10 The number of steps levels which you will allow to be shed under normal conditions Num of emergency steps Demand limiting only 0 to 10 The number of steps RS 8D M1 22 AK2 SC 255 Reference Manual 117 Danfesi levels which you will allow to be shed when the emergency generator is running Normal soft start begin level Coupling begin level Emergency Soft start begin level Coupling begin level Wattnode Plus configuration Demand limiting only 0 to the number of normal steps set above up to 10 if 8 normal steps are configured for example the upper limit of this entry is 8 This entry specifies the level down to which loads will be turned on when the emergency generator starts A level will be added each minute unless the specified emergency load for shedding to start 1s reached Emergency generator control 0 to 99999 Enter the upper demand limit you do not wish to exceed for the given hour of the day under normal operating condi tions when using normal power There is one field for each hour of the day from 00 to 23 This screen has two pages in order to list all the hours of the day Emergency generato
149. henever you need to create a custom control strategy or define an on off input or 140 AK2 SC 255 Reference Manual RS 8D M1 22 Starting Configuration Plan strategy first Miscellaneous relay outputs RS 8D M1 22 Devt sensor input not available through refrigeration HVAC or lighting configuration you will need to configure one or more miscellaneous points You might use a miscellaneous relay output point for an exhaust fan a dispenser that adds chemicals to an evaporative condenser an oven a produce fogger or any other device that can t or shouldn t be treated like an ordinary refrigeration HVAC or lighting point Miscellaneous on off inputs and sensor inputs can be used in defining the strategy for miscellaneous relay outputs They may be monitored for history and may be config ured strictly for that purpose or for alarms Alarms can be created for any miscella neous point For sensor inputs the AK2 system allows custom conversion for non Danfoss sensors that have a linear response The way you begin configuration of a miscellaneous point depends on whether there are any miscellaneous points already configured First select Miscellaneous from the Main Menu Select Configuration and the Configure Miscellaneous Menu appears 11 0 2002 Mlali Ss PH Configure Miscellaneous el Calculations Belay Outputs Conw Factors iJ Sensor Inputs EE Alarms i Onr OEE Inputs User Screen A Variable
150. iated Flush Cycle Duration 10 to 20 The number of minutes the flush cycle will run Lockout on low head pres List box Yes No Whether or not heat reclaim will be locked out when head pressure is below a setpoint to be entered on the next line Lockout Pressure 99 0 to 500 0 The low head pressure at which heat reclaim will be locked out Lockout on liquid level List box Yes No Whether or not heat reclaim will be locked out on low refrigerant level Liquid level sensor type List box Sensor input An analog sensor is used for liquid level 48 AK2 SC 255 Reference Manual RS 8D M1 22 Refrigeration alarms configuration RS 8D M1 22 Devt On Off input A digital sensor is used for liquid level None There is no liquid level sensor monitored Liquid 99 0 to 99 9 The liquid level as a percentage of receiver volume at and below which heat reclaim will be locked out As refrigeration configuration changes alarms are automatically created but not enabled for the analog and digital inputs created Trip levels and time limits can be set for these alarms by selecting Alarms from the Configure Rack menu and pressing ENTER The Configure Rack Alarms menu looks like the illustration at left below 1LO 10 2002 O1 07 41 PH 10 10 2002 Type Name Address 5 uct i DFL M Phase Loss Phase Loss A oo d P Compressors Disabled Suction Pres 44 00 0 Circuits Suction Fres AA 00 0 Condenser Suct
151. ified time period 0 9999 seconds minutes or hours Cond fan failure A digital alarm that can be enabled to occur when a condenser fan is called to run and fails to show proof digital monitor fails to read ON within the time period specified in the alarm 1 9999 seconds minutes or hours AK2 SC 255 Reference Manual 133 Configuring Other rack alarms Configuring Bitzer rack alarms 134 Dave Unless there are Bitzer compressors on the rack the final selection on the rack alarms menu is Other As is the case with other alarm configuration pages the alarm must be enabled its action level changed from Disabled to Log Only Normal or Critical before the parameters are visible The alarms are as listed below the screen illustrations ee re ee Type Name Address A Suction Low water temp Hotwater Cl 06 4 P Compressors Mormal below 75 0 F for lz min Low liquid level Liquid Lvl C dO6 3 Circuits Wormal below 10 0 4 for 90min Condenser E 5 Eitzer Low water temp if hot water heat reclaim is configured An analog alarm that occurs when water temperature is below a set temperature from 999 9 to 999 9 degrees for a period of 1 to 9999 seconds minutes or hours Low liquid level if a liquid level sensor is configured An analog alarm that occurs when receiver liquid level has fallen below water temperature is below a set percentage but values from 999 9 to 999 9 are allowed degrees for a period of 1 to
152. igured in the Store Info screen 0 0 to 150 0 The heat reclaim setpoint during store closed hours as configured in the Store Info screen 0 0 to 150 0 The outside ambient temperature above which heat reclaim will be locked out 0 to 99 The number of minutes after the start of a heat reclaim stage before the next stage can start Also the minimum on time for every stage Time of day field The time for heat reclaim flush to begin each day 0 to 99 The number of minutes duration for each heat reclaim flush 0 to 4 The number of configured auxiliary heat stages in the HVAC unit 0 0 to 150 0 The zone temperature setpoint for auxiliary heat during operating hours as configured in the Store Info screen 0 0 to 150 0 The zone temperature setpoint for auxiliary heat during store closed hours as configured in the Store Info screen AK2 SC 255 Reference Manual RS 8D M1 22 Lockout above ambient Delay between stages Analog gas valve Temperature difference Min valve opening Valve delay ClimaTECH dehumidification configuration Devt 0 0 to 150 0 The outside ambient temperature above which auxiliary heat will be locked out 0 to 99 The number of minutes after the start of an auxiliary heat stage before the next stage can start Also the minimum on time for every stage List box Yes No Whether or not the HVAC unit has a controlled analog gas valve ClimaTECH controllers have only one analog variable
153. ill be used 1 to 180 The number of minutes defrost must be on before termination List box Yes No Whether or not anti sweat heaters will be controlled by the AK2 SC 255 When you configure an evaporator and answer Yes to the anti sweat control question a relay output is created which is then wired to a relay controlling the anti sweat heaters The name of the relay output will be Antisweat the name of the evaporator or circuit then the rack suction group and circuit number for example Produce AA3 0 0 to 100 0 The dewpoint above which anti sweat heaters will be on constantly 0 0 to 100 0 The dewpoint above which anti sweat heaters will be cycled Cycling will occur unless the dewpoint rises above the setpoint specified in the previous line 2 to 999 The time interval on which anti sweat cycling is based List box Yes No Answer Yes if fans are to be controlled during and after defrost If you answer No fans will run continuously during both refrigeration and defrost List box Yes No The answer determines whether or not fans will run during defrost List box Yes No Whether or not fans are to be stopped when temperature rises above a setpoint to be specified in the next line 58 0 to 99 9 The temperature at which fans will be stopped List box Yes No A Yes answer will cause fans to remain off after defrost termination for a specified period of time or until a specified temperature is re
154. in Monitor phase loss TYes Heat ramp up if LAT gt 75_0 F Which phase loss monitor Not configured Cool ramp up if LAT 54 5 F Shutdown phase loss TYes behn ramp up if LAT 44_ 5 F Shutdown on smoke detect Yes Speed Min Max Shutdown on fire alarm 7 Yes Inverter 60 0 100 0 Heating 50 0 lOO 0 No of return sensors 7H Cooling 60 0 100 0 Controlling sensor Return Air Z l Dehumidi fication 50 04 75 0 Wo of supply sensors TZ BPM at max speed 100d Controlling fensor Supply Air 2 1 PG DN for more Fan type Fan control OPEN hours List box 1 Speed The unit has a single speed fan 2 Speed The unit has a two speed fan Variable VO Fan speed is variable with a drive controlled by an analog output board variable output board Variable VLT A variable speed fan is controlled by a Danfoss VLT adjustable frequency drive List box Continuous The fan will run continuously during open hours Store open hours are defined in the Store Info screens On demand The fan will run on demand during open hours whenever heating cooling dehumidification or venting is called for Fan control CLOSED hours List box Post delay Heat ramp up if LAT gt Cool ramp up if LAT lt Dehm ramp up if LAT lt Continuous The fan will run continuously during hours when the store is not open Store open hours are defined in the Store Info screens On demand The fan will run on
155. in this HVAC unit Includes the number of outside air coils 0 to 2 The number of outside air coils in this HVAC unit List box Yes No If Yes is chosen the leaving air temperature at the outside air coil needs to be less than outside dewpoint for the coil to be active 20 0 to 60 0 The leaving air temperature at and above which outside air coils are enabled 40 0 to 95 0 Question is repeated for OA coil 2 if present The leaving air temperature at and above which the named outside air coil lis enabled 0 0 to 100 0 One target per cooling stage excluding outside air coil stages The target temperature that you want the first stage to maintain at the zone sensor 0 0 to 9 9 The range selected creates a dead band For example if the target is 72 and the range is 2 the stage will come on at 74 and will not be turned off until the temperature reaches 70 0 to 60 One setting per cooling stage The number of minutes that must elapse after target plus range is reached before the stage will come on 0 to 60 One setting per cooling stage The number of minutes that must elapse after target range is reached before the stage will be turned off There is one field for each stage configuration The Danfoss RTC control board can function as a stand alone or as a node on the I O network of an SC 255 system To begin configuration select RTC as the type of unit in the Configure HVAC menu A menu for the unit is then presente
156. ing demand limiting ssccssseseesseeseeees 114 121 Mea a E A E E E 114 COn E E A E ATE E E E E 114 118 Weattnode Pis Gonic urd ON seron o E E E 118 ABOU SO SIE E E E E E E E E E E E AE EE E A O E T 119 Connec urine demand Mmi No essees 119 121 HVAC demand MINNS cc cers cnmnte nae seacacnsweetenasedeahavsnachanhicesaede noteesdsnteeeussaeaneesaceaatuanpauiecaiteaacuee 119 120 Liebing demand AGING ts stn sezassesaaaesoasanacce em aticnssaxecnacenstesovsecaameedeansvacscuuendonacacncactaceisetesestoususeecaaes 120 How demand ATW OLS setae dpeeccu secs vaz ane sescosecracee ee cdocesusencenee i E E E 120 121 1 6 CONTIGQUFING ALANIS wiccsisccsccsicccensenhencttumncasnccvetencwesunsndecwiusauewiveectvnawiucotsvecaneciseateceiveteenstda 121 140 ile On FPO FN SBC e E E E 121 Conioiunne Te Fe WO alarmis escrin E E r N 122 135 Aas SUS OOS GL a pcae ress ccindtes seen cseemeec cease rtiespbetisonsebe eerean st ensanadnaschacot aopeczeguncu sqacnbeewacecuntancatncaeaenes 123 124 US COE Cie TE TTS sessed eyecare a E sida dudcunenc adhe cmeess ueeds A 124 Con AE alarma SS I DS carer cc cere tain cc aseste se ccvercs candace eraveceuienecemoenscensincueoutavacsananeceeanaccnetcaeectaces 124 126 ANOS UAE e E E A sauce A E T aides eauieceevonceoseiaeneaeee 126 127 Field imitsand umts foranalos GAGS ssrecusasscrsacaacuscinsscacasanamianscscsnsa peneseanenusessdanasde tae ceceamneanantouses 127 Deabhinie als ae e S TEREA EE E N E E E mieb
157. ion Temp 4A 00 0 i ther Disabled High Temperature Suction Temp AA 00 0 Normal above 50 0 F for 15min PG DN for more The set of alarms that are created automatically as you proceed with configuration of a rack is shown in the menu by selecting one of the menu items in this case Suc tion the alarms for that part of the rack are presented The first page of suction alarms is shown at right above One of the list boxes has been opened to reveal its options For each alarm the first line contains an alarm type the name of the point the alarm is based on and the point s address The second line contains the alarm action setting Critical Normal Log only or Disabled the trip level setting Gf based on an analog sensor input and the time setting If the action is set to Disabled the level and time settings will not appear but are retained in memory as is the case with all in the example screen except the last alarm High Temperatuare Suction Temp AA There are five times when alarms are not generated for refrigeration temperatures 1 during keyswitch overrides 2 during the delay after override 3 during defrost 4 during the delay after defrost and 5 when alarms have been suspended The two delay periods are defined in the refrigeration configuration screen for the each circuit The meanings of the alarm action settings are as follows AK2 SC 255 Reference Manual 49 50 Alarm Levels What You Can Chan
158. ir coils are configured the first cooling screen looks like this Controlling sensor TAverage Wum of cooling stages T4 Mun of outside air coilstzZ Consider dewpoint TMo OA Coil LAT low limit 740 0 F Enable 0A Coil 1 above 50 0 F Enable OA Coil 2 above 7i F Target temp for stage 1 74 0 F 2 74 0 F och as lee oe eee ae eet eke E 1l oO F Pre delay for stage fl 1 min 2 1 min OAL 1 min O47 1 min Post delay for stage l 1 win 2 1 min OAL 1 min O47 1 min PG DH for more Number of zone sensors Controlling sensor RS 8D M1 22 AK2 SC 255 Reference Manual 0 to 5 The number of zone sensors in the area of the store served by this HVAC unit List box Min Temp Control will be based on the lowest value of all temperature sensors in the unit s zone Max Temp Control will be based on the highest value of all of the temperature sensors in the unit s zone 79 Num of cooling stages Num of outside air coils Consider dewpoint OA Coil LAT low limit Enable OA Coil 1 above Target temp for stage Range Pre delay for stage Post delay for stage RTC Devt Average Control will be based on the average of all the temperature sensors in the unit s zone Zone Temp 1 1 etc each zone temperature sensor will be available as a choice in the list Control will be based on the single selected temperature Sensor 0 to 6 The number of cooling stages
159. isabled Low Pressure Suction Pres C oO6 1 Disabled High Pressure Suction Pres C 06 1 Disabled Low Temperature Suction Temp C 06 5 Disabled PG DN for more AK2 SC 255 Reference Manual RS 8D M1 22 Devt The fields and their meanings are as follows Type Label field In the top line for each alarm the leftmost column shows the type of alarm Name Label field The name of input either digital or analog that trips the alarm See note at the end of the discus sion of this screen about Alarms Suspended alarms Address Label field The board and point assignment of the input given under Name This is where the input is physically wired For example the phase loss digital input the second alarm in the screen shown above is wired to point on board 8 The suction pressure sensor an analog input for rack C is wired to point 1 on board 6 Alarm Action List box In the Type column in the second line for each alarm is the current alarm action setting Initially as shown above all alarms are set to disabled as they are automatically created during configuration of refrigeration The same is true of the alarms created for HVAC and other store systems We can use this screen to change the alarm action levels The choices in the list box are these Disabled The alarm is deactivated and will not occur or dial out Its configuration settings if any will remain in memory for future activation All alarms are in this st
160. l load OF HRS L000 Normal load O amp HRS 7 1Lo00 Normal load 09 HES 1Loo0 Normal load 10 HRS 7 1000 Normal load 11 HRS 7 Looo In the Setup screen these are the fields Note that with each answer a box will appear in the center of the screen cautioning that proper meter function requires that the values entered here are the same as the values entered at the meter Number of CT sets EMON only 0 to 5 The number of meters sets of current transformers connected to this meter Wattnode assumes a single set of CTs Amperage either List box EMON or Label field Wattnode In the list box entries range from 25 to 3100 A Select the amperage of the CTs For Wattnode enter the amperage directly into the label field Voltage num phases List box a complete selection of supermarket voltages with number of phases following each in parentheses Pick the correct combination for this meter inbutton field Put the cursor here and press ENTER to begin setup Collect History List box Yes No Whether or not history is to be collected from this meter Use unit for demand lim List box Yes No Whether or not this meter is to be used for demand limiting Window size Appears only if Yes is selected in the previous AK2 SC 255 Reference Manual RS 8D M1 22 Devt question List box 15 20 or 30 minutes The window width is set to 15 20 or 30 minutes Every minute the window slides forward s
161. lay Disch Press A 160 0psi 0 0 0 v Suction Temp AA e 0 0 o000 08 Disch Temp AAl iste ese Bp a 000 0E Oil Press AAl 30 0psi 0 0 0000 07 Disch Temp Aaz l131 7 F o 0 000 0E Oil Press A 30 0psi 0 0 0000 07 pe Se ee eee Select Sensor Adjustment from the Suction Service menu and this screen appears Each sensor s current reading appears next to its name There are three additional columns Man List box M blank This field allows you to set a the 166 AK2 SC 255 Reference Manual RS 8D M1 22 Devt sensor to a fixed value if for instance a sensor has failed and you are awaiting a service replacement To set a manual value select the M from the list box then enter the desired value in the Current field which becomes a label field as soon as the M is entered At the same time when the M is entered the Offset and Input fields no longer appear Offset Label field A field where you can enter an offset to adjust the sensor s reading when calibrating with actual temperature as read from a refrigeration thermometer If you change an offset from a negative to a positive value the sign will not change until you enter the first numeral from the keypad You can only offset a real sensor you cannot enter an offset for a reading being received from another controller And you cannot use a large offset to fake a missing sensor Input The sensor s current electrical value in volts or ohms for comparison
162. lay is not used when the zone cycles off 11 06 2002 Ei Configure Lights Pre eat Coo o tac sree eee T win Foste see erie eee ieee ge tT Z win Minimum OF time 2 T1Z0 min Minimum OFF time 10 win Enable dimmer output 7 Targeta a e a emer 7 50 4 Para output eee TOTU S Feaction Time THormal vrerride switch 2 24 TYes Owerride duration t 00 02 Burglar wre pride Ji ees TYes Fre Ge Vat yeeetc eos ea ee cee 7 O min Fire Override oes sine 5 TYes PG DN for more Pre delay Post delay AK2 SC 255 Reference Manual 0 to 120 When lights are off the number of minutes that the lighting condition must be satisfied before lights will be turned on O to 120 When lights are on the number of minutes that the lighting condition must be false before lights RS 8D M1 22 Board amp points configuration lighting Powerlink configuration Cutler Hammer configuration RS 8D M1 22 Minimum ON time Minimum OFF time Enable dimmer output Target Minimum output Reaction time Override switch Override duration Burglar override Pre delay Fire override Dstt will be turned off 0 to 255 When lights are turned on the number of minutes that they must remain on before being turned off 0 to 255 When lights are turned off the number of minutes that they must remain off before being turned on List box Yes No Whether or not a dimmer variable output will b
163. lays showing all the types of points that can be created and for SI points units For the purpose of discussing the screen let s assume that we are creating an OI a digital input We select OI the first item from the list box Now the screen looks like this LlL fOe s2002 LL 09 06 AM Title area gt Lyi or o Uraa Lane amp Heading ____ p Sune Miraris Nana Data Definition Data y RUJ Hob conii gur adl D E E a E Definitions lt lt lt if Insertion bar BES first True line Ru J Uti fi E E a Rules area y Else line The screen is divided into four areas which from top to bottom are the following Title area The date and time at the very top then the settings icon and screen title in this case Configure Ca 01 OL Heading area The heading of the screen tells what type and style of point will be created The fields are as follows AK2 SC 255 Reference Manual RS 8D M1 22 Devt Units Style Undo button Cancel button Data definitions area This area contains information that identifies points that will be used in the logical statements in the next area and the current value of each The area by default has lines for two definitions but it can be enlarged by selecting the horizontal divider line between it and the next field pressing ENTER and then selecting Insert from a popup box You will see this done in a few pages during the presentation of our first example Rules area
164. lds for Relay Outputs Point 1 to 8 The number of the point Name Label field contents depend on system configuration The name of the point The names are fixed since the hardware points on the RTC board are dedicated and can control only a single type of device as follows Point 1 Fan Point 2 Economizer Point 3 Cool 1 Point 4 Cool 2 Point 5 Cool 3 Point 6 Heat 1 Point 7 Heat 2 Point 8 Heat 3 On List field N Open The point is wired through normally open contacts N Open The point is wired through normally open contacts Configuring RTC I O Sensor Inputs Here is the screen for sensor inputs reached with the second icon from left Configure ETU 2 I O Points iJ Sensor Inputs AKC 55 Point Name Config Ed Ptr l zone l Humidity Yes z COZ Sensor Yes 3 Outside Humidity Yes 4 zone l Temp Rec oo 5 Zone Z Temp Rec o o 6 Outside Temp Wo 7 Supply Air Temp Wo 5 Return Air Temp Wo EDE a Point 1 to 8 The number of the point Name Label field contents depend on system configuration The name of the point The names are fixed since the hardware points on the RTC board are dedicated and 90 AK2 SC 255 Reference Manual RS 8D M1 22 Configuring RTC I O on off inputs RS 8D M1 22 Config AKC 55 Bd Pt Devt can serve only for the listed devices The names always appear as in the illustration above whether the sensor is used or not List field one for each point Yes The sensor is configured It should be
165. ll be based on the single selected sensor Target differential 0 1 to 100 0 The differential selected creates a control dead band around the target temperature For example if the target 1s 72 and the range is 2 the stage will come on at 70 and will not be turned off until the temperature reaches 72 The pre delay and post delay must also be satisfied Target temp for stage 50 0 to 99 9 A separate field for each of the stages in the unit Pre delay for stage 0 to 15 The number of minutes that must elapse after target plus range is reached before the stage will come on There is one field for each stage Post delay for stage 0 to 15 The number of minutes that must elapse after target minus range is reached before the stage will be turned off There is one field for each stage Ambient temp lockout List box Yes No Whether or not heating is to be locked out above a set ambient temperature next line No heat above 0 0 to 100 0 The ambient temperature above which heating will be locked out Night setback List box Yes No Whether or not the heating setpoints are to be lowered by an offset next line RS 8D M1 22 AK2 SC 255 Reference Manual 85 RTC dehumidification configuration Night setback offset Minimum ON time Minimum OFF time Danfesi when the store is closed according to a schedule or schedules configured in the Store Info screens 50 0 to 50 0 The amount by which the heating setpoint set on previ
166. lti deck single deck service etc List box There is a large selection of common fixture names for each of the fixture types that can be se lected above and there is a selection User Def After making that selection you will be able to spell out your own name on the following line Label The name of a user defined fixture Any of the characters in the AK2 SC 255 character set can be used including upper and lower case letters and symbols List box Yes No Whether or not a box door switch will be monitored appears for boxes only List box Yes No Whether or not to shut down refrigeration when the box door is open 0 to 15 The number of sensors in this fixture or circuit List box Yes No Whether or not temperature contol will be used List box Min Temp The lowest of the sensors in the fixture or on the circuit will be used for temperature control Max Temp The highest of the sensors in the fixture or on the circuit will be used for temperature control Average The average of all the sensors in the fixture or on the circuit will be used for temperature control circuit names The name of each sensor will be listed and any can be selected That sensor then will be used for temperature control 99 0 to 150 0 target 1 0 to 20 0 range The target AK2 SC 255 Reference Manual 29 Type of defrost Drip down delay Termination type Termination temp Term relay for each case Term relay for each case
167. m move the cursor to the next changeable field Because we are configuring a digital alarm that is constrained to a value of On the only remaining fields we can change are for the time The numeric value can be set to any number from 1 to 9999 and in our example we have entered 1 The field for the time units has a list box as seen below from which you can choose sec min or hour For the Phase Loss alarm 1 minute is an appropriate setting so we leave the field reading min RS 8D M1 22 AK2 SC 255 Reference Manual 125 126 Analog alarms 4 27 19 PH Type Name Address Alarms Suspended Hack C E Disabled Phase Loss C Normal On for Phase Loss Low Pressure Suction Pres C Disabled High Pressure Suction Pres C 06 1 Disabled Low Temperature Suction Temp C 06 5 Disabled PG DN for more Let s now configure the Low Pressure alarm which is an alarm for an analog value Move the cursor to the action level field under the type description Low Pressure open the list box and select Normal As with the Phase Loss alarm whose configura tion was just described a line of settings appears to the right of the action level as shown in the screens shown below 4 08 2003 11 54 20 AM Type Name Address Alarms Suspended Hack C Alarms Suspended Hack C Disabled Disabled Phase Loss Phase Loss C o8 1 Phase Loss Phase Loss C os 1 Normal On for lmin Normal On for lmin Suction Pres C dO6 1 Mormal below
168. mp disch temp List box Yes No Whether or not compressor discharge temperature is monitored AK2 SC 255 Reference Manual RS 8D M1 22 Stop comps on high temp Cutout Cutin Stop comps on low temp Lockout below Disch pressure safety Cutout Cutin Unload before cutout Neutral Zone control Devt List box Yes No Whether or not compressors are to be shut down on high discharge temperature 0 0 to 300 0 The discharge temperature at which compressors are to be cut out 0 0 to 300 0 After a cut out on high discharge temperature the discharge temperature at which compressors are to be cut in List box Yes No Whether or not comrpessors are to be cut out on low discharge temperature 0 to 255 The number of minutes that must elapse before a lockout on low discharge temperature See note on next field 0 to 300 The temperature that discharge must be below for the time specified in the preceding field before lockout on low discharge temperature occurs Note If discharge temperature rises above the setpoint the time for lockout will restart from zero List box Yes No Whether or not comrpessors are to be cut out on high discharge pressure 0 0 to 500 0 The discharge pressure at which com pressors are to be cut out 0 0 to 500 0 After a cut out on high discharge pressure the discharge pressure at which compressors are to be cut in List box Yes No Whether or not comrpessors are to be unlo
169. n of schedules Tl Photocell Phoroce ll Boe Soe ey eee Outside Control Sensor o oonan TaAveraqge Control method aaan T chd and photo Enable failsafe scheduletYes Time on lz2z 00 AM Time off 12 01 AM Photocell tange ns SOs Photocell range 7100 Trip Level 1 08 Trip Level 1 0 ee D 32 0 4 O8 E 0 6 0 Always keep 1 relay on 1e Auto rotate felection Yes PG DN for more PG DN for more Zone name List box A great variety of typical names are included in the box that pops up plus User Def that allows the next line User defined name Label box any 11 characters Num of control relays 0 to6 The number of relays controlled by the lighting point Num of schedules 0 to 8 The number of schedules for this point Photocell List box Inside The point s photocell s are indoors Outside A single photocell is located outdoors None This point has no photocell Control sensor List box Min The lowest reading photocell at any given time will be used as the control sensor Max The highest reading photocell at any given timewill be used as the control sensor Average All photocells are averaged and the aver age value is used as the control sensor value Photocell ID 1 etc If any specific photocell is selected its value alone will be used as the control sensor value Control method List box Schd and photo For this point to be on two condi tions have to be satisfie
170. n on site with the AKC 55 for diagnostic purposes If the delay is too short there are situations when the AKCESS system may dial out alarms so frequently that it is not possible to dial IN to the system Baud The baud rate of the receiving station The rate can be set to 300 1200 2400 9600 14400 28800 or AUTO The default is AUTO which will auto detect the receiving station modem rate For most purposes it is best to set the Baud field to Auto Type The type of receiving device either Printer or AKA 65 Init Anextra initialization string which may be needed for some modes of communication Default is AT The entry is user editable Date The date format DD MM Y Y DD MM YYYY MM DD YY or MM DD YYYY Time The time format either 12 hour or 24 hour Schedules The schedule for dialouts to this phone number Date The date format DD MM Y Y DD MM YYYY MM DD YY or MM DD YYYY Language List box Allows language selection for transmited alarms Send alarms when cleared List box Yes No Default No If Yes is selected The designated monitoring station will be sent alarms when a previously reported alarm has cleared Time The time format either 12 hour or 24 hour Schedules The schedule for dialouts to this phone number Messages By selecting Messages from the Communications menu a messages screen appears AK2 SC 255 Reference Manual RS 8D M1 22 Instructio
171. n once again below left you will be presented with the first page of a list of alarms for rack C s con denser as at right below er re ee O4 10 2003 E Configure Back C Alarms Type Name Address A Suction js High Pressure Disch Press C Oo6 2 Compressors Wormal above 50 0 psi for lomin Hi Invert resets Fan Inv Reset C 09 1 Circuits f Normal above 3 Cyc in l5mnin tE ondenser Inverter failure Fan Inv Bpass C 08 7 Normal On for LSmin Cond fan failure Cond Fan Claf o3 1 Other Normal Off for LSmin Cond fan failure Cond Fan C344 5 Bitzer 5 Mormal Off for Llomin E E _ _ _ _ _ lt lt lt a a We have shown above only the first page of alarms Depending on the number of fans there may be additional condenser fan failure alarms on a second page High Pressure discharge pressure sensor This same alarm appears on the compressor alarms page and you may have set it up already It is an analog alarm set for a pressure from 999 9 to 999 9 psi or bar and a time limit of from 1 to 9999 seconds minutes or hours Hi Invert resets if variable speed is configured A cycle digital alarm with the trip level a number of cycles 0 9 in a specified time period 1 to 9999 seconds minutes or hours Inverter failure if variable speed is configured and the inverter bypass is monitored A digital alarm that can be enabled to occur when the inverter is in bypass for a spec
172. natameeanosoucassectieusubumtashonasaduateanenteceaatoedoons 13 Starting with a completely un configured AK2 SC 255 wo ccccccccccccssssnnssnsssssessssesseeseeeeeeeececeeeeeeeseeeeaaaaaaas 14 IN ay i Makor CA ES acca oad aces nceaseatcaitonercsuredecace daen yemenoaususasaatacctusxenceuavaesadaancnetuetoatomeeeiesseee 14 Pe CT AUS e E E E E A S 14 Potaa labon a E 14 Cons aed ed a R A E E A E EE 14 15 On anna ae T E E E E A E 15 16 AE AAC e AE E E A EE E EE E 16 Configuring Suction Info seeeeeesssssssssssssssssssssssettrrrrrererssssssssssssssssseessseterrrrreressssssssssssssssseeeeeseeeeeene 16 19 Conngurne tWo stage SY SECIS sroine eaii i aa ea i e iiao Enna 19 20 Configuring C mprESSONS ersed AEEA Ta E 20 22 Compressor oiland safety Information cg 22d ovenetcovesscacnapaceensanseapeccusteedncco yeas tacanns blaeseasaneneiauctestaioees 22 23 IN CUCIAN ZZ OMe 6 OO a E E E E 23 COMpPressOr capacity staging PaAE INS csc oven svesterssiecusasendenseadizapianswestsaeuennStasetvelsiieasiuseresteclaeaadneces 24 25 GTi ETI Eyaporato s siessen ase desea dang E A AA E E Aa 25 31 ASS FeO m DUO e E EEE E E EE 27 Configuring AK2 SC 255 refrigeration circuits ccccccccscccssssssssessesssseeseceeeecccceeeeeseeeeeeeaaaeaaaaaeeeeeeeseees 28 Configuring defrost 32 33 Conanin eVa OAL ONS sou ctescecaacvenanasaeactexestasesesessxteacastie esses oiniodsvenaoaunvadetasneoconse sarusessscetavmnacaemasaaueeees 33 34 Coo OU I odene aot a vtec e
173. ned off There is one field for each stage List box Yes No Whether or not auxiliary heat is to be locked out during hours when setback is effective List box Yes No Whether or not heat is to be locked out based on ambient temperature 0 0 to 100 0 Auxiliary heat will be locked out above this temperature plus range next line Heat will be allowed on again when ambient temperature has fallen to lockout minus range 0 0 to 9 9 The range selected creates a dead band around the lockout temperature Heat will be locked out at lockout temperature plus range and once locked out will be allowed on at ambient lockout minus range With an analog gas valve selected the second heating page looks instead like this AK2 SC 255 Reference Manual 71 Configure ETU 11 00 24 AM Heating Ra l ux Heat target temp 7 _ 50 Oey op lee cl le hy eee ember ae a 7 60 min Fost delay a aaae a 7 60 min Lockout aux ht in setbkE Yes Ambient heat lockout 7 Yes Ni heat abore te ee ree o o F eae ea gil el eat ae es aE Z 0 F Lom Fire Posi von 2 2 62 T 0 0 Low Fire Duration 7 3 min Max valve opening i 35 04 Min valve opening 25 0 4 Degrees to max apening 4 F PG DN for more Aux heat target temp Pre delay Post delay Lockout aux ht in setbk Ambient heat lockout No heat above Range Low Fire Position Low Fire Duration Max valve opening Min valve opening Degrees
174. nels No of Cutler Hammer Panels 0 to 5 The number of Cutler Hammer Pow R Line C Switchboard lighting panels to be configured Zones share photocells List box Yes No Whether or not multiple photocells are to be shared Number of photocells 0 to 8 The number of photocells Appears only if photocell sharing is enabled by a Yes answer to the previous question Name Label The name of the zone as established on its first setup page Type List box AK2 SC 255 The zone is controlled by a relay output digital output on the I O network PWRLK The zone is controlled by a breaker or group of breakers in a Square D Powerlink lighting panel CUTLR The zone is controlled by a breaker or group of breakers in a Cutler Hammer Pow R Line C To begin configuration of an SC 255 lighting zone put the cursor on gt Setup lt and AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 Devt press enter The first page of the setup screen is shown in the illustrations below on the left for an inside photocell and on the right for an outside photocell In the screen on the left a user defined zone name has been chosen On the right one of the listed zone names has been chosen 11 fos 2002 OF 44 17 PP 11 fos 2002 Configure Lights sone nane ene ean Spee User Def zone nane aan ror Parking Lot User defined name TZone 1l Mun of control relays 7 1 Mun of control relays 76 Mun of echedules T1 Mu
175. ng dehumidification and heating The range defines a deadband on either side of the setpoint in which no control action is taken Setpoint 40 0 to 150 0 Range 40 0 to 150 0 Min fan speed 0 0 to 100 0 The minimum percentage of rated fan speed allowed Heat Dehumid fan speed 0 0 to 100 0 The percentage of rated fan speed during dehumidification or heating Shutdown on fire alarm List box Yes No Functional only if the fire alarm has dry contacts wired to a digital input on the ClimaTECH controller or is being broadcast by the AKC 55 The fan will be shut down on occurrence of a fire alarm Monitor phase loss List box Yes No Whether or not a phase loss detector 1s monitored Which phase loss monitor List box All configured phase loss detectors Select the phase loss detector to monitor Shutdown on phase loss List box Yes No Whether or not the fan is to be shut down on detection of a phase loss by the moni tored detector ClimaTECH cooling configuration El Configure Unit 1 Mum of cooling stagqes 7 4 OQecupied setpoint i o o0 F Umoccupied setpoint o o0 F Lockout below ambient _ 0 0 F Delay between stages 7 l min Num of cooling stages 0 6 The number of cooling stages in the HVAC unit Occupied setpoint 0 0 to 150 0 The cooling setpoint during operating RS 8D M1 22 AK2 SC 255 Reference Manual 101 102 ClimaTECH heating configuration Unoccupied setpoint L
176. ng Units and Languages ccccccseesseeeeseesneeeeeensseeeeccenseeeseeenseeeeseonnseeesooenseesseonaes 155 PART TWO Using the Status Screens and Service Functions 2 1 RS 8D M1 22 Authorization Just Looking seiisecesssvscieinntacadiwads tatendoerdinedinadivadinaladadecniacadecntanedivadonntadesnesdscadanndscsioeabecetinadoeecsanied 157 158 Geeting Authorized to make changes x cudorsivrednestorudunatonndeuadonssvendosssiachabetebadsdaaenaialasesadedstebesebadaetatataneseludededebadebadebes 158 159 Units and Languages Selecting socenesssesecosesasiedlwsnciediuaustedueteuinientdumcuedsdaususl hantansseceseesesasaeaassscoecadsesdenewsoessaersassaseoteaesteuetl 159 Navigation and Making Changes ccsssssccsssseeseeeseeeseenseeceesseeeesseeseesseesonseeesooaes 159 164 Getting back to the icon menu sesesssssssssssssssssssssseetttreterrrresssssssssssssssssssssssettrreerrreeesessesssssssssseeeseseeeeereno 162 Viewin and onan ine SeN aeee ea E E E EEEE EEE 162 Chanine numeri values sssrinds in E E eea e arr 162 Cane ae i o dS aa E A A E EE er rete tt 163 Changing the From and To times sessnsrisrriiiriesicreerainssinini rnein naaa 163 Chane imne ihe days ofthe Week and MONG Ay S enrensari eE E AS 164 Changing label fields cnc s 2scersexesenssncncvannceinenwitecubentnsebyebes dade veedueneinivanssssiuaneasssaendaldetentedeievedwcaauiepebewsdedeaenieies 164 AK2 SC 255 Reference Manual 7 Devt 2 2
177. ng an external switch attached to one of the Smart Case Controller s auxiliary on off inputs The input must be configured using the AKC 16x Settings screen Sensor failure The Smart Case Controller has detected a failure of one of the sensors configured for the fixture either Liquid In Gas Out Case Box or Defrost tempera 170 AK2 SC 255 Reference Manual RS 8D M1 22 Devt ture For fixtures with a KVQ electronic evaporator pressure regulating valve Sensor failure can indicate a problem with the NTC sensor in the valve actuator When in Sensor failure status an AKV valve will operate at the mean percentage used during its most recent period in Normal operation status A KVQ valve will open fully in sensor failure mode To determine which sensor has failed go to the alarms screen Service shutdown The Smart Case Controller has been shut down using the service screen either for case cleaning or other Service The screen at left below is the second page of an evaporator status screen SDFZ Food AAl Status Addr 1 YC eee Selling Addr 1 AEC 164 Normal Operation v5 05 Thermostat Target 10 0 F Case gt 2 8 F Antisweat Auto On Target 7 10 0 F Dewpoint Se Sei Antisweat Defrost NTC Temp 7 214 0 F ON Above z 40 0 F ON Above gt 40 0 F Terminate 50 0 F EVO Release 266_ 0 F Cycle Above 30 0 F Cycle Above 30 0 F Coord gt On Cycle Time 1200 sec Defrost Bun Times Defrost Cycles Today es O20
178. ns for use of the message screen are shown in the illustration above Remember to toggle edit mode for each line by pressing the key and press Seryice Messages 1 Key in messages using the arrow C 2t kexa or connect by AFA 65 and C 32 type messages rom your keyboard C 4 C B The C in the box at the end of c 6 the line clears that line only C Ti C The Liear Messages button at c Sethe bottom of the screen clears C 10 the messages a Clear Messages EBREEESE LL ENTER at the end of each line 2 6 Using the History Screens for History Retrieval RS 8D M1 22 To view history select History from the Main Menu and the History Menu appears screen Menu History pj Configure History Retrieve History Status Collecting Next select Retrieve History and you will see the Configure History Display AK2 SC 255 Reference Manual 187 ory Display Hot configured Not configured configured Not configured Not configured mom Ww bh E l l l a s View Sam Units Sensor Inputs No olm psi Suction Pres AA No olm psi Suction Pres AB No lim F Suction Temp AA No lm F Suction Temp AB No lm psi Oil Press AB1 Ho lm psi Oil Fress AA BUDE oe re i S Once the points to be displayed up to five at one time are selected the top portion of the screen will show their names sample intervals and their respective SC 255 s The body of the screen lists all th
179. ntrng 2jAce Security 2iDivision Office 31 3 4 PR DMN for more Alarm destinations are chosen by classes Each class can be sent to one or more of the phone numbers one or both of the IP network addresses to one of up to three OAB s to a local printer or to any combination of destinations The destinations are indicated by the column heads and subheads as follows IP Net 1 2 3 4 Phone Numbers 1 2 3 Local OAB Print Any class of alarm then can have from 0 to 9 destinations The bottom panel of the screen shows the phone numbers and the IP network adddresses Each active phone number and each IP network address should be given a name Names can be assigned in the Phone Numbers screen and in the IP Net work screen respectively Reach these screens by placing the cursor over the boxed words Phone Numbers or IP Network and clicking The numerals that appear to the right of the listed telephone numbers and IP ad dresses correspond to the numerals that head the columns in the upper part of the screen Paging down shows additional information in the bottom panel AK2 SC 255 Reference Manual 181 182 Printer Settings Screen A Alarm Routing Class Fhone Numbers IP Net Local 2 OAE FEN ra bj l l l Syat ern Rack psi Rack temp Case HVAC Mise Burglar Fire Sete et ee Bae Sted ed ed ed ed l l l l l l PY a oed ed ed ed be l PRERPRER Send critical alarms every 9
180. o choices for example Yes and No in the Monitor phase loss field Some may contain many choices When that is the case one of the lines in the box will contain three dots When the cursor is moved to the three dots additional choices appear Now that we understand navigation and making changes we can go on to a discus sion of each of the configuration screens In the rack Info screens the following are the fields and their possible contents Rack label 2 stage system No of suction groups Upper case letters A to Z The name of the rack List box Yes No 0 to 5 Note that for a rack with existing configura tion entering and confirming a O will cause deletion of all existing rack information List box The kind of refrigerant 9 characters not constrained List box Yes No Whether or not there will be a Refrig type Oil type Monitor phase loss AK2 SC 255 Reference Manual 15 Adding a Rack Configuring Suction Info Dave digital input from a phase loss monitor Generate input for each appears only after a Yes answer to the preceding question List box Whether there is a phase loss input for each rack or each suction group Shutdown phase loss appears only after a Yes answer to the Monitor phase loss question List box Yes No When all of the items on the Rack Info screen have been configured press MENU to return to the Main Menu There is only one way to add a rack From the Main Menu
181. o that it always contains the most recent period of time Each minute the accumu lated KW during that minute is recorded Normal load nn HRS Emergency generator control 0 to 99999 Enter the upper demand limit you do not wish to exceed for the given hour of the day under normal operating condi tions when using normal power There is one field for each hour of the day from 00 to 23 This screen has two pages in order to list all the hours of the day Meter setup demand limiting continued p3 Page down after entering normal load for every hour to finish configuration of the meter The page looks like this 11 06 2002 i Meter Setup Meter 1 Maximum emergency load 1000 Start shedding at 7 30 Start restoring at 7 80 Enable coupling switch Raves Wumber of normal steps 7 Wum of emergency steps 7 O Normal Soft start begin lewel QO Coupling Begin Lewel 7 QO Emergency Soft start begin lewel QO Coupling Begin Lewel 7 D The fields in the screen are these Maximum emergency load Demand limiting only O to 99999 Enter the upper demand limit that you do not wish to exceed when the emergency generator is running Start shedding at Demand limiting only O to 100 Enter the percent of maximum load at which you want to start shedding loads Start restoring at Demand limiting only 10 to 80 Enter the percent of maximum load at which you want to start restoring loads which have been s
182. oard amp Points RS 8D M1 22 Desf among the Degree Masters in the system Locate Locate button field See the explanation Locate and Init below Init Init button field See the explanation Locate and Init below When a new Degree Master is added to the SC 255 system or when there has been a service replacement you must use the Locate Procedure so that the SC 255 will recognize the Degree Master Follow this procedure 1 Enter an address from 1 to 99 that is unique among the Degree Masters in the system 2 Select Locate and press ENTER or click with your mouse 3 A message will appear requesting that you press the service pin 4 You have 10 minutes to go to the particular Degree Master you are working with and depress the service pin The service pin or button is located beneath the upper right corner of the square white label on the Degree Master 5 Use a pencil or other instrument that will fit through the access hole to depress the service button and keep it depressed for five seconds It will take the SC 255 from 10 to 15 seconds to complete the location process after which a message box will appear on the SC 255 telling you that the process has been successful This process must be repeated for each new or replacement Degree Master After starting the locate procedure from the SC 255 keypad it is possible to activate the service pin from the Degree Master s display Press and hold both but
183. ockout below ambient Delay between stages Dave hours as configured in the Store Info screen 0 0 to 150 0 The cooling setpoint during store closed hours as configured in the Store Info screen 0 0 to 150 0 The outside ambient temperature below which cooling will be locked out 0 to 99 The number of minutes after the start of a cooling stage before the next stage can start Also the minimum on time for every stage There are two pages of settings for heating configuration lo fis zo002 HS Configure CT ETU amp Heating Ra ES Configure CT ETU 5 Heating Ra E a Num of heat relm stages z Wum of aux heat stages 1 Occupied setpoint 0 0 F Occupied setpoint 7 0 0 F Unoccupied setpoint 0 0 F Unoccupied setpoint o o F Lockout above ambient 7 O 0 F Lockout above ambient 0 0 F Delay between stages l min Delay between stages 7 1 min Analog gas valve Yes Heat reclaim flush start 01 00 AM Temperature difference _ o o F Flush durati n e 7 10 min Min valve opening 7 o valyre dele o a oe de O sec Num of heat rclm stages Occupied setpoint Unoccupied setpoint Lockout above ambient Delay between stages Heat reclaim flush start Flush duration Number of aux heat stages Occupied setpoint Unoccupied setpoint 0 to 4 The number of heat reclaim stages 0 0 to 150 0 The heat reclaim setpoint during operat ing hours as conf
184. on Settings Schedules Alarms Service Authorization You can move the cursor from icon to icon with the left and right arrow keys Once the cursor is positioned pressing ENTER will take you to a screen for the function RS 8D M1 22 AK2 SC 255 Reference Manual 161 162 Getting back to The Icon Menu Viewing and Changing Settings Changing Numeric Values Dave represented by the icon Before we travel using some of the icons let s look at the navigation possible from the rest of the screen To move off of the bottom icon menu press the UP ARROW One of the compres sors 1s now selected In this particular screen the information above the compressor icons pertains to the whole rack and the information below the icons applies to the compressor that is highlighted If you press the right arrow key you will move the cursor to the next compressor as before the information at the bottom of the screen will pertain to the highlighted compressor If you press ENTER with a particular compressor highlighted you will get a screen with run times and other available information about the compressor EXIT will return you to the previous screen When you are working with a screen that has an icon menu at the bottom and you have left the menu to enter the main body of the screen you can return to the icon menu by pressing the MENU key When using a PC you can back up one screen by clicking in the screen title area Back at the Suc
185. on oil fail Yes Low oil pressure diff 7 5 0psi Oil pressure delay T60 sec Wo of oil reset attempts 3 Min time between resets 5 min Monitor comp disch temp Yes Stop comps on high temp Yes Cutout 240 0 F Cutin 230_ 0 F Shop comps on low temp Yes Lockout 90 min below 40 0 F for lmin Disch pressure safety Yes Cutout 325 0psi Cutin 275 0psi Unload before cutout Yes The fields and their contents are as follows Oil control List box Yes No Whether or not oil control is implemented Type of oil monitor List box Sensor Input An analog input sensor input is used to monitor oil pressure On Off A digital input on off input is used to monitor an oil pressure switch Copeland A Copeland oil monitor is used Lockout comp on oil fail List box Yes No Whether or not compressors will be locked out when an oil failure is detected Low oil pressure diff 0 to 50 The oil pressure differential when an analog sensor input is used that will cause compressor shutdown Oil pressure delay 0 to 255 When an analog sensor is used the number of seconds after oil failure is detected before compres sors are reset No of oil reset attempts 0 to 10 After oil failure is detected the number of reset attempts before compressors are locked out Min time between resets O to 60 After a reset whether successful or not the number of minutes that must elapse before another reset attempt Monitor co
186. ons Select one of these and you will be taken to that type of other controller From left to right the icons represent the following AKC 16x Smart Case Controllers EKC fixture controllers and monitors Degree Master case controllers VLT adjustable frequency drives Bitzer variable speed compressor control modules DCU case controllers EKC circuits Board amp Points Board amp Points configuration for EKC controllers begins by selecting EKC from the Configuration Board amp Points menu Our example shown below has only one circuit If EKC has been selected as the circuit type for more than one circuit in the suction group this screen will show a list of all of those EKC circuits 58 AK2 SC 255 Reference Manual RS 8D M1 22 10 10 2002 Confiqure Back EEC By ERC Controls ea Name Addr Circuit sd 55 Init Upload Wink The fields and contents are Name Label field any 15 characters The name of the evaporator being controlled by the EKC The default names for the EKC circuits automatically added during configuration of refrigeration are shown and will suffice in many applications They can be edited character by character put the cursor on the field press to change to edit mode then use the left and right arrow keys to move from space to space and the up and down arrow keys to select the character for that space When the name appears as you want it press ENTER Address 0 to 99 The address set
187. ool Trp AAS ST 02m 02m Suction Temp AA 10 01 AM Dra 0 40 3 44 1 30 4 10 02 AM 5 3 Sell osr 1 1 22 9 10 03 AM 5 3 Bell doso Gli 22 9 10 04 AM Pa Sell Bee Azid 294 10 05 AM Bee Sell Bee Aza 29 0d 10 06 AM Tad 0 44 3 42 3 25 4 10 07 AM Tsd 0 44 3 42 3 25 4 10 08 AM Tan Bell 2e e 282 2942 10 09 AM Ted Bel ost omel 2928 10 10 AM foe ea 40 4 42 9 30 4 10 11 AM Tea ea 40 4 42 9 30 4 19 12 AM PE 0 43 4 41 8 30 93 04ra 10 01 008 to O4 06 99 10 12 00A Rate 01 Min Seroll Full creen The five selected datapoints are listed at the top of the screen Next the start date and time for the display are shown You can change the start date and time as you would any other numeric field The last line in the screen heading contains the display interval and the scroll setting The Rate determines the interval between displayed lines of data in the body of the screen It is important to remember that the display rate is not necessarily the sample rate which is set during history configuration see Chapter 4 9 Often the display rate and the sample rate may not be the same If not the displayed value for a given datapoint will be the most recent as of the display rate time The Scroll field regulates how much of the screen will be scrolled when you press one of the small arrow buttons in center bottom of the screen The selections possible are Full for full screen scroll Half one sample or any of 9 time periods ranging
188. ooled is made in this field RS 8D M1 22 AK2 SC 255 Reference Manual 35 Fan type Number of fans Fan staging Monitor stages Control sensor Danfesi None There is to be no condenser control by the SC 2355 Evaporative There are evaporative condensers that are controlled by the AKC 55 Discussed in the next section of the manual Air Cooled The AKC 55 is controlling air cooled condensers The remainder of this section this screen and the next four pertains to this selection List box Single Fan The condenser has a single fan Multi Fan The condenser has multiple fans 2 Speed The condenser has a single 2 speed fan 0 to 12 The number of condenser fans List box Individual Fans will be turned on and off individually to create a number of stages equal to the number of fans Paired Fans will be turned on and off in pairs to create a number of stages equal to half the number of fans List box Individual Fans will be monitored individually with a digital input on off input created for each fan Paired Fans will be monitored in pairs with a digital input created for each pair List box Pressure A pressure sensor will be used to control the condenser fans An analog input sensor input will be created for the sensor Dropleg Temp A temperature sensor placed on the dropleg will be used to control the condenser fans An analog input sensor input will be created for the Sensor Sat Cond
189. or hours Configuring Compressor Alarms We will return now to the configuration screen for rack C alarms and select Com pressors Type Name Address A Suction High Pressure Disch Press C Oo6 2 Comp short cycle Compressor C 1 08 1 Circuits Disabled Comp oil failure Oil Fail C 1 09 6 Condenser Disabled High oil resets Oil Reser C 1 09 7 E Other Disabled High Temperature Disch Temp C 1 06 7 5 Bitzer Disabled PR DN for more The first page of the compressor alarms screen appears as at right above For a multi compressor rack there will be several pages of alarms The alarm types depend 128 AK2 SC 255 Reference Manual RS 8D M1 22 Configuring Circuit alarms RS 8D M1 22 Devt to some extent on the way rack configuration questions were answered The alarms for the lead compressor will be listed first and similar alarms will follow for the other compressors on the rack Listing all the types of alarms they are High Pressure discharge pressure sensor An analog alarm set for a pressure from 999 9 to 999 9 psi or bar and a time limit of from 1 to 9999 seconds minutes or hours Comp short cycle compressor digital sensor A cycle digital alarm with the trip level a number of cycles 0 9 in a specified time period 1 to 9999 seconds minutes or hours Comp oil failure if an oil failure digital is configured A digital alarm that can be enabled to occur when the oil failure sensor is on for a specifi
190. ore information 50 0 to 100 0 The temperature that the adaptive control algorithm will seek to maintain in the fixture Does not appear when dynamic adaptive control is selected 0 0 to 100 0 The dead band around the temperature target As long as the fixture temperature remains in this range the suction pressure target will not be modified Does not appear when dynamic adaptive control is selected 0 to 99 9 The number of psig that the adaptive algorithm will be allowed to cumulatively add or subtract from the suction pressure target 0 to 60 The number of minutes after termination of defrost during which there will be no target adjustment Does not appear when Sensor is selected as the type of adaptive control List box Yes No Determines whether or not the adaptive algorithm will be allowed to adjust suction pressure below the target if fixture temperature is above target temperature range List box Yes No Determines whether or not suction pressure will be offset according to a schedule to be specified in the following lines Time field The start time for night setback Time field The ending time for night setback Days selection field The days on which night setback will be effective 18 AK2 SC 255 Reference Manual RS 8D M1 22 Configuring two stage systems RS 8D M1 22 Devt Setback holidays Holidays selection field The holiday numbers on which night setback will occur Holiday numbers a
191. ound it is white on a dark background AK2 SC 255 Reference Manual 159 160 Devt Press one of the arrow keys and you will see that this condition moves from item to item on the menu You are moving the SC 255 s cursor To select from any SC 255 menu first use the arrow keys to move the cursor to the item you want the cursor will only land on areas where action is possible then press the ENTER key You can use the EXIT key to reverse your steps one at a time Let s assume that you press ENTER with the cursor on Refrigeration You will move to the next level which is the Refrigeration menu where all of the configured racks are listed At right below is the refrigeration menu Depending on the installa tion your refrigeration menu many be different Back Suction Current Target eee Suction AA TSS ipsa lz psi Evaporators Back Overview Suction AB ie ape 7 psi n Back B Suction BA 4 5pei 5 psi Condenser m Back Service Back C Suction CA 4psi 6 Opesi Suction CE l3 7psi 14 0psi j Heat Feclaim 4 Configure Back Receiver In this menu there is some status information displayed the current suction pressure and for reference the target suction pressure Since there is more than one rack being controlled by this SC 255 the cursor can be moved between racks If there were only one rack only one selection that could be made After selecting a rack press ENTER and the rack Menu appears as at right above Each
192. ous page is to be lowered during non scheduled hours as set in the Store Info screens 0 to 60 The minimum number of minutes heating must run after being turned on before being turned off 0 to 60 The minimum number of minutes heating must remain off after being turned off before being turned on control actions See preceding two settings There are two pages of dehumidification configuration settings 10 15 2007 E Configure ETU 05 50 26 AM Dehumidi fy R 10 15 2007 Configure ETU Dehumidification type Cooling Aux heat during dehumid Mo Control dehumid On oeae Calc Dewpt Control dehumid using average Night setback 4 eaves 25 6 T Wight setback affset 2 0 F Target A A a EE 7 SO 0 F Target differential e 6 a Pre delay for stage l 1l min 2 1l min Fost delay for stage fl amp min F Ff min Cooling low limit 7 68 0 F PG DN for more Dehumidification type Aux heat during dehumid Control dehumid on Control dehumid using AK2 SC 255 Reference Manual List box None Cooling The type of dehumidification used List box Yes No Whether or not auxiliary heat is allowed during dehumidification List box Humidity Dehumidification will be controlled based on a specified humidity target A humidity sensor is required Calc Dewpt Dehumidification will be controlled based on a specified dewpoint target which will be compared with
193. preceding one in that it does not originate from the ClimaTECH controller It is presented on this screen because it pertains to the system whose alarms are being configured Returning now to the main Alarm Configuration Menu the next item after HVAC is Miscellaneous Using the the miscellaneous alarms screens you can create custom AK2 SC 255 Reference Manual RS 8D M1 22 Example Misc alarm RS 8D M1 22 Devt alarms to add to those automatically created as you configure the controller This is a powerful feature of the SC 255 with great flexibility Every relay output and sensor will be listed in the miscellaneous alarm screens Alarms can be configured here to be active on only specified days too You can also create multiple alarms for the same relay or sensor with different time delays and action levels After you select Miscellaneous from the main Alarm Configuration Menu you will see the first page of the first of five miscellaneous alarm list screens It lists all the relay outputs in the system The Alarm Configuration Menu and the Misc Alarms Relay Output list screen are shown below 01 44 52 PH ni i Alarm Configuration me Bd Pr Name Value H ilarms Refrigeration B Routing O1 1 Compressor D 1 oft z iai 01 2 Unloader D la off o l 3 Unloader D lh off T HVAC Phone Mumbers O1 4 Comp Reset D 1 off o 0l 5 Compressar D Z off E Oo1 6 Unloader D fa off E E A IP Network o1 7 Unloader D Zh off T Oo1 8s
194. put appears in the first example in the miscellaneous calculations section which follows in a few pages You can configure up to 64 miscellaneous sensor inputs per SC 255 To configure a miscellaneous sensor input select Sensor Inputs from the Configure Miscellaneous menu When the Configure Misc Sensor Inputs screen appears increase the number of sensor inputs in the first line by 1 or a higher number to match the number of inputs you want to configure Edit the name of the input then complete configuration by making a selection for each field for each new input the enter the number of on off inputs you want to configure A step by step configuration example for a miscellaneous sensor output appears in the first example in the miscellaneous calculations section which follows in a few pages You can configure up to 64 miscellaneous on off inputs per SC 255 To configure miscellaneous on off inputs select On Off inputs from the Configure Miscellaneous menu When the Configure Misc On Off Inputs screen appears increase the number of on off inputs in the first line by 1 or a higher number to match the number of inputs you want to configure Edit the name of the input then complete configura tion by making a selection for each field for each new input the enter the number of on off inputs you want to configure A step by step configuration example for a miscellaneous on off input appears in the second example in the miscellaneous calcul
195. r or DCU refrigeration can be controlled directly by the AK2 SC 255 Con figuration of such circuits starts by selecting AK2 SC 255 in the Type column for the circuit on the Evaporator menu then moving the cursor to the word Setup for that evaporator and pressing ENTER A screen like the one at left below will appear The AK2 SC 255 Reference Manual RS 8D M1 22 RS 8D M1 22 same screen with all its fields revealed appears as at right 1lo o4 2002 Fizture Type ee een ee ce a Fixture Wane os 222 32 3 Wo case hox sensors Temperature control Target 25 0 F f Pepe of defrost coco The fields are as follows Fixture Type Fixture Name Enter user defined name Monitor box door Shutdown when door open No case box sensors Temperature control Controlling sensor Target O3 47 41 AM Loysoryzoo2z Fixture Type gBox User Def Fixture Neier lot bees User Def Enter user defined name Circuit Monitor box door 2 22 25 TYes Shutdown when door open Mo Wo case hoxu sensors tT 2 Temperature control TYes Controlling sensor THin Temp Target S5 0 R pr 2 07F Type of defrost o ooann TElectric Drip down che Waar sys ocr ee 60 sec Termination type 2 TDefrost sensor Termination temp o o F Term relay for each catetYes Term input for each casetYes for more PG DN for more List box Various types of fixture can be selected box mu
196. r Normal it will dial out to indicate that the suspension has occurred The number of minutes for the suspension can be set Suspending rack alarms One common reason for suspending rack alarms is rack service requiring a partial or complete equipment shutdown In such a case pressures and temperatures could reach elevated levels giving rise to many alarms A technician would suspend alarms to forestall unneccessary communications to the store by monitoring personnel An operator who wants to suspend alarms does not enter configuration screens to do so To suspend alarms it is only necessary to be authorized for refrigeration functions or the higher Supervisor level To suspend rack alarms select Refrigeration from the Main Menu then select the rack being serviced from the refrigeration menu and then select Rack Service from the Rack menu The Rack Service menu looks as at left below lo 127 E7 AM ee Suction Groups p Heat Feclaim E Evaporators Receiver Condenser iJ Verify Sensors i Suspend Back C Alarms When the Suspend Rack C Alarms button is selected a pop up window appears as in the screen at right above The only changeable field is the Suspend for field which can be set to any value from 0 to 9999 A full description of the alarm suspension function will be found in chapter 5 2 Using the Service Screens Configuring Alarm settings Let s return to the Configure Rack C Alarms screen shown
197. r control 0 to the number of emergency steps set above up to 10 if 8 emergency steps are configured for example the upper limit of this entry is 8 This entry specifies the level down to which loads will be turned on when the emergency generator starts A level will be added each minute unless the specified emergency load for shedding to start is reached Emergency generator control O to 99999 Enter the upper demand limit you do not wish to exceed for the given hour of the day under normal operating condi tions when using normal power There is one field for each hour of the day from 00 to 23 This screen has two pages in order to list all the hours of the day When the meter being set up is a Wattnode Plus Wn Plus there there is a second page to the setup screen Clicking on PG DN for more at the bottom of the first setup page will display the second page On that page you will find the following additional fields to be entered Power update 0 60 default 5 The interval at which power is measured Energy update 0 60 default 5 The interval over which energy the integral of power over time 1s calculated Reactive update 0 60 default 5 The interval over which reactive components are recalculated Demand period 5 720 default 15 The interval over which demand is calculated Demand is defined as average power over a specified time interval Demand subintervals 1 8 default 1 The number of divisions
198. r each BRack Shutdown phase loss TYes Jser Authorized The Configure Rack A screen shown at right above has information fields that can be changed by any user with a proper authorization code To make changes use the arrow keys to move the cursor to the field you want to change To enter numerals for a field like No of suction groups use the numeral keys on the controller keypad then press ENTER Labels are entries that you need to spell out The Rack label field contains a label one character in length The Oil type field is also a label field but it is 9 characters long allowing you to spell out a word or words indicating the oil type for example Mineral To enter a label place the cursor on the field then press the key This action toggles the function of the arrow keys so that the UP and DOWN arrows scroll through the alphabet and all the other possible characters Once the character you want in that space appears use the RIGHT arrow to move to the next space when the field has more than one space Again use the UP and DOWN arrows to reach the character you want When all the characters in the field are as you want them press ENTER to save the entry The Rack label field is a constrained field It will only accept an upper case letter even though lower case letters appear as you scroll through the characters The No of suction groups field is also constrained It will only accept a single numeric character
199. r each suction group will include a special page for the low side The screen looks like this AK2 SC 255 Reference Manual 19 Configuring compressors 10 14 49 AM Configure Rack A Low Temp AA A Suction Info Is this stage low side Yes Low side shutdown Shutdown on hi suct FSI tYes High side suct PSI T 60 0psi Shutdown on hi suct temp Yes High side suct temp 100 Obey Control desuperheater Yes Controlling Sensor TDesuper In AA Desuperheating temp 7 80 0 F LEH se es ae alee See Rye et eee z 0 F PR DW for more The fields and their contents are as follows Is this 2 stage low side List box Yes No Is this the low side of the two Low side shutdown Shutdown on hi suct PSI List box Yes No Whether or not to shut down the low side compressors when high side reaches a specified suction pressure High side suct PSI 99 0 to 200 0 The high side suction pressure at which the low side will be shut down Control desuperheater List box Yes No Whether or not de superheater Controlling sensor control is implemented on this rack List box Desuper In AA Control is based on a sensor moni toring the liquid in temperature at the de superheater Desuper Out AA Control is based on a sensor monitoring the liquid out temperature at the de super heater Suction Temp AA Control is based on a sensor monitoring suction temperature Desuperheating temp 50
200. rategy is selected by the answer to the Control sensor question above If Cutin Cutout is selected the next page will provide for selection of cut in and cut out setpoints The page is not shown here but is straightforward Target control type Please read about all of the possible answers List box Ramp together Where there is variable speed fan motor control fans will come on in stages at minimum speed then all will be ramped up together Ramp stages Where there is variable speed fan motor control each stage will be brought on and ramped up When a stage is at maximum speed and additional fan capacity is needed the stage will be dropped to minimum speed and the next stage brought on at minimum speed then ramped up as required Neutral Zone Danfoss Neutral Zone control will be used This is a strategy that operates to move current value closer to target more rapidly the farther away the current value is from target If you select Neutral Zone here you will cause the next page answer on inverter control to change to None That will in turn lock this selection to one between Rate of change and Neutral Zone since those strategies apply to installa tions without variable speed fans If you change equipment strategies or select Neutral Zone in error first change the Target control type here to Rate of Change then go to the next page and change Fan inverter control to the appropriate variable speed control either VO or VLT to re
201. re defined in Store Info configuration At the bottom right of the Suction Info screen are the words PG DN for more Use the controller s PG DN key to reach the next screen shown at left is the default screen in which not all the questions and fields appear the screen on the right shows all the fields Monitor suction temp fres Display superheat temp 7 Ma Monitor suction temp Yes Display superheat temp No Monitor desuperheat temp ia Close EEV valves During rack shutdown Wa If suct above target by 7 5 0 psi Monitor desuperheat temp ia Close ARV valves during rack shutdow 7 The fields and their contents are as follows Monitor suction temp List box Yes No Display superheat temp List box Yes No Monitor desuperheat temp List box Yes No Close EEV valves during rack shutdown List box Yes No If suct above target by 0 to 999 9 Number of psig above target when AKV valves will be closed during rack shutdown Delay time O to 45 Number of seconds after suction pressure reaches target the number specified in the preceding field that AKV valves will be closed Rack on AK2 SC 255 address 0 to 15 The address of the SC 255 controlling the rack that serves these EEVs Press EXIT to return to the Configure Rack Menu and continue refrigeration configu ration and de superheaters If and only if a rack is configured as a two stage system the suction configuration fo
202. ries on this screen are within the manufacturer s specifications 1 0 to 150 0 The maximum percentage of the maximum RPM that the fan motors will be run Insure that the entries on this screen are within the manufacturer s specifications 1 to 6000 The RPM at the maximum percentage specified in the previous setting 10 to 10 The maximum number of inverter resets after which a subsequent reset condition will place the inverter in override 1 to 600 The number of seconds that must elapse between inverter reset attempts 1 to 600 The number of seconds without proof before an inverter reset is attempted Split condenser control Split condenser configuration is done on the next page of the Configure Condenser screens When there is one valve and one split the screen appears as at left below when there are two or three valves the screen at right appears with the appropriate number of setpoints Oo 08 P2002 04 47 16 FH 5plit GOMES er ee 5SpLlit cond nser nean TYes Spe wt based h oeeo oo cae 7 Ambient Split based on Control method ara Tlvalrerlsplit Control method Split when below 7 S50 0 F 5Split desdba and cee ee 44 0 F Drop fans e sees Soke soe THone Split on heat reclaim Mo Setpoint Level 1 z 52 0 F Level 42 0 F Level 3 race OFF Deadband 4 0 F Split pressure override Yes Split pressure override Yes Cut in 200 Ops Cutout 275 0ps i Cut in 200 0psi Cubout 275 0p
203. rned Off points from will be listed in order of creation Sorting is instantaneous when the field contents are changed The screens for the various types of I O points are very similar The screen that appears initially is that for relay outputs Screens for other types of points are reached via the icons at the bottom of the screen which are from left to right Digital outputs relay outputs Analog inputs sensor inputs Digital inputs On Off inputs Analog outputs variable outputs Other controllers The Other Controllers selection includes a number of diverse kinds of network nodes that can be appreciated from the menu that appears when the Other Controllers icon is selected The menu is shown below 178 AK2 SC 255 Reference Manual RS 8D M1 22 13 02 200 01 28 05 PM VLT Deg Master Utility Meter HA im EJ a EEC Bitzer ETC Light Panel ClimaTECH DCU Carrier m Ea m BE TETE E The information shown for the controllers similar to that shown above for relay outputs Section I of the manual Configuration covers parameters used in the various controllers List Nodes The List nodes screen reached from the I O Network Status menu looks like this os for 2005 Ol 4d1 32 PH Comm Status Type Address Status Beast r Status To I Offline SC ak Online SC Z Online Bo SI l 1 nline EO SI l Z Online OI l 3 nline SI Ca Ol Online View Sas Comm Status The list node
204. rs must be installed Outside Dew Dehumidification will be controlled based on a specified outside dewpoint target An outside dewpoint sensor is required Control sensor List box 1f controlled by dewpoint or humidity only and if there are multiple sensors Min Humidity or Min dewpoint Control will be based on the lowest reading of a group of sensors RS 8D M1 22 AK2 SC 255 Reference Manual 73 Control humidity sensor Control temp sensor Target Target differential Pre delay for stage Post delay for stage Cooling low limit RTU dehumidification configuration page 2 lofis 2z00F Devt Max Humidity or Max dewpoint Control will be based on the highest reading of a group of sensors Average Control will be based on the average of a group of sensors Dewpoint 1 1 etc Any single dewpoint sensor can be selected Humidity 1 1 etc Any single humidity sensor can be selected List box similar to the preceding appears only when using Calc Dewpt as the control strategy List box similar to the preceding appears only when using Calc Dewpt as the control strategy 0 0 to 100 0 The control target in percent relative humidity or dewpoint degrees depending on the strat egy chosen above 0 1 to 15 0 The differential forms a deadband above and below the target in which no control actions are taken Dehumidification will be turned on at target plus differential and turned off at target minus differential 0
205. s Targen E T 7 150 0pi PG DW for more The fields are as follows Condenser type List box This section deals with condenser configu ration when the selection Evaporative is made in this field None There is to be no condenser control by the SC 42 AK2 SC 255 Reference Manual RS 8D M1 22 Number of pumps Daily rotation Monitor stages Control sensor Monitor dropleg temp Control method Target control type Devt 299 Evaporative There are evaporative condensers that are controlled by the SC 255 The remainder of this section this screen and the next four pertain to this selection Air Cooled The SC 255 is controlling air cooled condensers The configuration of air cooled condens ers is covered in the preceding section of this manual 0 to 2 The number of coolant pumps List box Yes No Whether or not pumps will rotate List box Individual Fans will be monitored individually with a digital input on off input created for each fan Paired Fans will be monitored in pairs with a digital input created for each pair None Fans will not be monitored List box Pressure A pressure sensor will be used to control the condenser fans An analog input sensor input will be created for the sensor Dropleg Temp A temperature sensor on the drop leg will be used to control the condenser fans An analog input sensor input will be created for the sensor List box Yes No Appears if control is by pressure
206. s i PG DN for more PG DN for more Split condenser List box Yes No Whether the condenser is split Split based on List box RS 8D M1 22 AK2 SC 255 Reference Manual 39 Control method Split when below Split deadband Drop fans Split on heat reclaim Split pressure override Devt Ambient Control is based on ambient temperature Discharge Control is based on discharge pressure List box lvalve Isplit A single valve when closed limits refrigerant flow to a part of the condenser providing two stages usually 50 100 2valve 2split Two valves are used to provide three stages usually 50 75 100 2valve 3split Two valves are used to provide four stages usually 25 50 75 100 3valve 3split Three valves are used to provide four stages usually 25 50 75 100 0 0 to 100 0 Only with single split valves The temperature below which the condenser will be split 0 0 to 25 Only with single split valves The deadband above the previous setpoint in which unsplitting cannot occur List box Even Odd Only with single split valves Which fans are dropped when condenser is split List box Yes No Only with single split valves Whether or not condenser will be split when heat reclaim is on List box Yes No Whether or not split function will be overridden based on high discharge pressure Cut in 0 0 to 500 0 The pressure below which split con denser operation is allowed Cutou
207. s screen shows the type address and status of every node on the I O network In the sample screen we have chosen to accept the default view All Using the list box in the View field you can choose todisplay initialization and version information as well These options are shown at left and right below RS 8D M1 22 AK2 SC 255 Reference Manual 179 180 IP Network Ethernet of o27 200 01 55 47 PHI Initialization Yersion Type Address Status Time Type Address SW Version Hdwr vo il WA vo l 4102uxuuX Nra SC 1 Pass O3 02 05 10 344 SC l wi 0S5 Nra SC z Pass O3 02 05 10 344 SC 2 w4 00 Nra BO SI tae te BO SI Pte PEO bases yhoo eS EO SI WSE De EO SI l EC l 4xx101 08 0 3 OL LSE a A I l 3 EC Ol 4xx 01 08 0 3 SI Ca Ol Ws SI Ca Ol Nra View ALL View ALL nO OO u TO es Before theintroduction of the AK2 SC 255 theDanfoss AKC 55 systems used third party Ethernet adapters In the 255 Ethernet communications is supplied on board the controller and no outboard equipment is required The Ethernet configudration screen is shown below W Hetwork Name Maintenance Net Baud AUTO Address 172 27 208 45 Delay 0 min Connection 1 Schedule 1 Eht eas From 12 00 AM Days SMTWEFA To 12 00 AM Holidays 1234567 Schedule 2 Not Used Schedule 32 Mot Used RES DN for more EHREEBEASE a The address required is an IP address and is the address of the ethernet node
208. schedule or schedules next page 0 0 to 50 0 The amount by which the heating setpoints are to be raised during night setback List box Yes No Whether or not there is an over ride switch wired to a digital input 0 to 1439 The number of minutes that control will be overridden after operation of the override switch 0 to 8 The number of operating schedules entered on the following page s AK2 SC 255 Reference Manual 97 SC4 dehumidification configuration lo fis zo002 iH Ambient temp lockout Wo d hum below Delay between stages Wight setback Wight setback offset Owerride switch vrerride duration Wum of schedules Seasons 4 Configure 54 Unit 4 10 15 45 AM Dehumidi ty R password PG DN for more Num of stages Setpoint Range Cooling low limit Ambient temp lockout No dehum below Range Minimum run time Delay between stages Night setback Night setback offset 98 AK2 SC 255 Reference Manual List box None Four Whether or not dehumidifica tion is controlled in the SC4 unit All SC4 units have four stages of dehumidification 0 to 99 The percent desired relative humidity in the zone 1 to 15 The range selected creates a dead band For example if the target is 45 and the range is 2 dehumidification will come on at 47 and will not be turned off until humidity reaches 43 0 0 to 100 0 The zone temperature below which mechanical coolin
209. se manual staging select Manual from the pattern list box then specify the number of steps you want The display that results will show a row compressor icons for each stage A compressor s unloaders are represented by the small rectangles to the right of the compressor icon In the sample screen compressors are all 20 HP and each has 2 unloaders Each unloader is 33 of compressor capacity These settings were determined on the configuration page for each compressor Stage 1 is fixed at zero capacity and cannot be changed To change stage 2 or any higher stage move the cursor to a compressor icon and press enter You will notice that the piston in the icon moves When it is up the compressor is on If there are unloaders on a compressor subsequent clicks on the compressor icon will turn the unloader steps on one at a time The small rectangles will change color to indicate that the step is on When all steps are on for a compres sor the next click on the icon will turn everything off As you change a stage s capacity the number in the right column of the screen will AK2 SC 255 Reference Manual RS 8D M1 22 Devt change for that stage giving the total horsepower you have selected for that stage You can change the number of steps at any time Configuring evaporators To begin configuration of evaporators return to the Configure Rack menu and select Evaporators Or from the Main Menu which you can always reach with t
210. sed on the lowest value of all of the supply air temperature sensors Max Temp Display will be based on the highest value of all of the supply air temperature sensors Average Display will be based on the average of all the supply air sensors Supply Air 1 1 etc each supply air temperature sensor will be available as a choice in the list Display will be based on the single selected sensor list box yes no Yes The fan will be locked out if fan proof is lost for five minutes Human intervention will be needed to restart the fan by using the Clear button on the status screen Evidence of the locked out condition and the means of ending the lockout are found on the status screen for cooling or heating function Status screens are covered in seciton II of this manual No The fan will not be locked out on proof failure configuration RTU cooling is configured after selecting cooling from the RTU configuration menu 66 AK2 SC 255 Reference Manual RS 8D M1 22 El Configure ETU 1 O9 02 44 AM Cooling i Munber af zone sensors T Controlling sensor TZzone Temp 1 1 Wum of cooling stagqes 7 Target temp for stage fl 74 0 F 2 74 0 F Pre delay for stage fl 1 min 2 1 min Post delay for stage fl 1 min 2 1 min PR DN for more Number of zone sensors Controlling sensor Num of cooling stages Target temp for stage Range Pre delay for stage Post delay for stage
211. senses no voltage Bd Pt Address field If the input state is received from another node on the I O network enter here the address of the point that is to be received Configuring RTC I O variable outputs Here is the screen for variable analog outputs reached with the fourth icon from left The names appear if the points are configured 92 AK2 SC 255 Reference Manual RS 8D M1 22 11 00 04 4M Wesley fue Configure ETU Board amp Points A Variable Outputs Points Mame Range al Fan Speed Vd 0 10 Volt z COZ Controlled Vo TERE A Pt lor 2 The number of the point Name Label field not changeable The name of the point The names are fixed since the hardware points on the RTC board are dedicated and can serve only for the listed outputs The names always appear as in the illustration above whether the input is used or not Range List field one for each point 0 10 Volt The output will supply 0 10 Volts 0 5 Volts The output will supply The input is config ured It should be wired 1f this RTC Address and Init Select the right most icon on the Configure RTC I O points screen and you will see this screen 04 10 03 PH Configure ETU I O Points PTC Address and Init Name ETU Address 0 Init z Init HERG HE ass RS 8D M1 22 AK2 SC 255 Reference Manual 93 94 Devt In the field labeled address give the RTC an address from 0 to 99 that is unique among all
212. setback offset 7 5 0 F Owerride switch T Yes Owerride duration 7 60 min Mam of schedules T 1 PR DN for more RTU cooling configuration page2 Refer to the screen above Ambient temp lockout List box Yes No Whether or not there is to be a lockout based on low outside ambient temperature No cooling below 0 0 to 100 0 The ambient temperature below which cooling will be locked out Range 0 0 to 9 9 The range selected creates a dead band For example if the lockout is 50 and the range is 2 cooling will be locked out at 48 and will be allowed on at 52 Default fan Speed List box High Speed Low Speed The fan speed for cooling A different fan speed can be chosen for dehumidification when it is configured Max suction press safety List box Lists every configured pressure sensor Any may be selected Only the suction pressure for the cooling compressors in this rooftop should be used No cooling above 0 0 to 100 0 The pressure value of the sensor selected on the previous line at and above which cooling will be cut out Cooling will not cut in again until the pressure falls below this value and the pre delay specified on the preceding page has elapsed Freeze protection List box Sensor Input There is a leaving air temperature for each stage of cooling near the coil At and below the setpoint next line the cooling stage will be turned off On Off Input A single digital input that
213. shows the screen with all of its fields revealed Additional information will be found in section Chapter 4 5 on alarms AK2 SC 255 Reference Manual 33 Configuring condensers 34 Low Temperature 2002 01 05 13 PM Low Temp AA E Evaporator Alarms Low Temperature Log Only If below fO0 0 F for 15 min High Temperature Disabled High Temperature Normal If above fO 0 F for 15 min Delay after defrost for 60 Min Dual Temp Dual Temp Low Temperature Disabled Low Temperature Disabled If below fO 0 F for 15 min High Temperature Disabled High Temperature Critical If above fO0 0 F for 15 min Eey switch override Yes Select misc point Wot configured Select misc point Wot configured Delay after override for 60 min Delay after override for 60 min Box door open Disabled Box door open Normal If open for 15 win Door open postition Disabled Door open postition Log Only If above 50 04 for 15 min SS Each alarm has three fields Alarm level Trip value Trip time List box Disabled The alarm is deactivated but any settings remain in memory so that they will be at hand when the alarm is reactivated Log only When the alarm occurs the fact will be recorded in memory but the alarm will not be commu nicated beyond the SC 255 over telephone line or network Normal When the alarm occurs it will be communi cated beyond the SC 255 one time over telephone line or network to the loca
214. si and right arrow keys to move from space to space and the up and down arrow keys to select the character for that space When the name appears as you want it press ENTER Address 0 to 99 The address set on the rotary address switches on the Smart Case Controller The installer should provide a list with the address for each fixture If such information is not available obtain the address by removing the waterproof rubber plugs over the address switches and reading the address Consult section 3 8 in chapter 3 of this manual for location of the switches Init Init button field Use in accordance with the following explanation of network re scan and initialization Network Re scan and Initialization After the Smart Case Controllers have been configured and addressed you need to re scan the network so that they are recognized then initialize them You must perform the following steps 1 From the Main Menu select Communications From the Communications Menu select I O Network 3 From the I O Network Menu select Re scan Re scanning the network can take several minutes After the re secan return via the Main Menu to the AKC 16x Board amp Points Configuration Screen and 4 Put the cursor on the Init field and press ENTER This action sends the configuration settings from the AK2 SC 255 to the Danfoss Smart Case Controller Navigation Notice that at the bottom of each of the Other Controllers screens there is a row of ic
215. sors will be used for anti sweat control Calc Dewpoint Dewpoint for anti sweat control will be calculated using the values of relative humidity and temperature sensors Dewpoint sensor to use If Dewpoint has been selected List box How anti sweat control dewpoint will be determined if a dewpoint sensor is used Min Dewpoint The lowest reading of a number of dewpoint sensors will be used Max Dewpoint The highest reading of a number of RS 8D M1 22 AK2 SC 255 Reference Manual 25 Danfesi dewpoint sensors will be used Average The average of a number of dewpoint sensors will be used Dewpoint 1 A single dewpoint sensor will be used for control others Other dewpoint sensors if they exist will be listed also Humidity sensor to use If Calc Dewpoint has been selected List box How dewpoint will be determined if a humidity sensor is used Min Humidity The lowest reading of a number of humidity sensors will be used Max Humidity The highest reading of a number of humidity sensors will be used Average The average of a number of humidity sensors will be used Inside RH 1 A single humidity sensor will be used for control others Other humidity sensors if they exist will be listed also Auto defrost schedules List box Disabled Enabled Enabling this option will cause the controller to suggest a defrost schedule based on the following two addi tional questions Maximum concurrent electric defrosts
216. ss T Mone Hgt Sethk Over E None Inverter fault None o Closed Fire Stat T None AEC 55 Inputs Nane Beast Or Bd Pt Owerride Mo Toltage 00 0 Fhase Loss 5 Mo Toltage 00 0 ENA E The third icon from the left at the bottom of any ClimaTECH board amp points screen brings up configuration for on off inputs At the top of the screen are inputs that may be wired to the ClimaTECH unit itself and in the lower half are pertinent inputs wired to to an SC 255 Point Type The point assigned to each functional input If the input is not used leave the Point field set to 0 List box The type of input Only OI is a valid choice None TP2 TP1 AK2 SC 255 Reference Manual 107 108 ClimaTECH Address and Init Uploading to the AK2 SC 255 Danfesi OI The input is an on off input 0 10 Volts This type can be used for any sensor whose output is linear from 0 10 Volts Fail List box Closed Open The type of signal that will be received if the drive has a fault Select the rightmost icon on the Configure CT I O points screen and you will see this screen OYfeLSE io 51 756 AM Configure CT ETU 5 I O Points My ClimaTECH Address and Init Name ee Bee edie i ets Address 3 Locate Locate Init Init Upload Upload Hea In the field labeled address give the ClimaTECH node an address from 0 to 99 that is unique among all the ClimaTECH nodes on the I O network for this SC 255 Remem
217. st of the sensor inputs we will need that for the leak detector Exit to the Configure Miscellaneous menu and select Sensor Inputs The configuration is straightforward for both of the sensors we need RS 8D M1 22 AK2 SC 255 Reference Manual 145 146 Writing the custom Strategy Data definitions Name 11 12 2002 11 0103 CFG ees oe eee l1l flz 2002 11 0103 CFG 11 45 05 Am eRe beeee SSO Inputs Hajt einki ensor Inputs Wo of sensor inputs 1 Wo of sensor inputs z Name Beast Bd Peo Type Name Beast Bd Fo Type Compr Bm Leak Wo OS 1 Leak Compr Bm Leak Mo USSL Leak Compr Pu Temp No 05 2 HERG HERG Navigate back to the Configure Ca 01 or whatever number screen now which we will repeat on the left as it looks when it first comes up After selecting OI as the type the screen looks as shown at right The type cannot be changed from OI unless Ca 01 is removed as the controlling point for the miscellaneous RO we created 11 o7 2002 01 13 45 PM 11 08 2002 11 05 08 AM a Ol O13 Hl Configure Ca Ol OT Units Style Generic ition Value Name Value configured lerror BOL Wot configured Tlerror line Value Lf Pesult Value off terror ROL _ eS abe error On On True On On Current Value 7 Error 7 On Current Value if Error On Notice the Undo and Cancel button fields in the heading of the screen Undo will erase your last step if you make a mistake
218. st recent 100 alarms will be displayed in the Active Alarms screen Cleared Alarms A cleared alarm is any alarm which has occurred but whose condition is no longer out of bounds whether or not the alarm has been acknowledged Any cleared alarms among the most recent 100 alarms will be displayed in the Cleared Alarms screen Alarm Status Alarm status lists every configured alarm and its current State for this SC 255 Network Alarms Network alarms lists every alarm in the system the entire network of SC 255 s which is active or cleared Up to 100 alarms will be listed in chronological order with the most recent alarm first Alarms which reoccur can appear more than once Configuration Configuration takes you to the Alarm Configuration Menu Alarm configuration is covered in Part One of this manual RS 8D M1 22 AK2 SC 255 Reference Manual 193 Dave The Active Alarms Screen The Active Alarms screen shows up to 100 active alarms for an SC 255 For each alarm there are three lines of information giving the type of alarm the name of the point the alarm is based on and its address the date and time that the alarm occurred and the condition that caused the alarm Alarm Ol 41 07 PMU ive Alarms Oil Press AAL O7 24 98 01 40PM at 42 4psi Now 42 4 below 50 0psi for 5 minutes Ack No Low il pressure Dil Press AAL o1 7 O7 24 98 01 40PM at 42 4psi WNow 42 4 below 50 0psi for 5 minutes Ack No Two fields on the righ
219. store the variable speed choices here Rate of change An algorithm of an earlier generation that approximates PID control by causing slower capacity change as the current pressure approaches target and larger changes when current pressure is more distant from target pressure Ramp stages if ambient 99 0 to 150 0 0 0 to 9 9 If Ramp together is selected the strategy will change to ramp stages if the ambient temperature is less than this setpoint RS 8D M1 22 AK2 SC 255 Reference Manual 37 38 Min sat cond temp Max sat cond temp Condenser Delta T Target Dave 0 0 to 200 0 The target minimum saturated condens ing temperature that the controller will strive to main tain Target is calculated by adding outside temperature and the condenser s design temperature differential 0 0 to 200 0 The target maximum saturated condens ing temperature that the controller will strive to main tain Target is calaculated by adding outside tempera ture and the condenser s design temperature differen tial 0 0 to 25 0 The condenser delta T furnished by the condenser manufacturer 0 0 to 500 0 for pressure sensors 0 0 to 200 0 for temperature sensors The value that the control algorithm will seek to maintain with the selected Strategy The next page has settings for high pressure bypass and for inverter control if used The page is reached by using PG DN The screen looks like this High pressure bypass
220. t 0 0 to 500 0 The pressure above which split con denser operation is disallowed Reaction zone and time If control method is Target the next page of condenser configuration has neutral zone control parameters for the PI control algorithm 40 AK2 SC 255 Reference Manual RS 8D M1 22 grog Z002 O3 17 37 PH Normal Reaction dgone W i Reaction Time Pius zone aa n a a e a gree 7170 sec Minus S24 ones ee ee 7 60 sec PG DMN for more The fields are as follows Informed adjustment of these settings is best done by Danfoss trained technicians Normal Reaction Zone 0 1 to 60 0 The range of pressure on either side of the target in which the condenser control algorithm reacts with normal sensitivity Plus Zone 10 to 900 The PI algorithm sensitivity when current control sensor value is above the normal reaction zone Minus Zone 10 to 900 10 to 900 The PI algorithm sensitivity when current control sensor value is above the normal reaction zone Enviroguard systems The next page is for setpoints that will be used with a Tyler Enviroguard system F F Min sat cond temp 760 0 F Min subcooling temp 75 0 F Elevation rack to cond 730 ft Open SPR if discharge 50 0 psi gt Target fan Wt fe OS 5 fd a pee eer eer eee fres Delay after SFR TS minutes The fields and contents are as follows RS 8D M1 22 AK2 SC 255 Reference Manual 41 Enviroguard Subcooling target D
221. t be the same as those shown here As shown in the sample screen the three most recent entries have been from the keypad The earliest 00026 was made by a supervisor 1 1 level and shows that a change was made in Authorization Configuration The second account code for the HVAC All level was changed Although the audit trail generally shows exactly what change was made by giving pre change and post change values in the case of authorization the actual values are hidden because all levels have access to the audit trail and only the supervisor level should see authorization codes If a supervisor wants to see the codes the authorization configuration screen to which no one else has access will show them all At the same time the supervisor changed the audit trail language settings so that the trail would be recorded in Spanish as well as English Notice that the pre change value No is shown before the post change value Yes All changes except authoriza tion changes will be shown in this manner At the bottom of the screen are some navigational aids i the asterisk indicates that this is the most recent page and that 00028 is the most recent entry in the audit trail 00028 shows the number of the most recent entry in the audit trail database lt lt an operator that moves the screen one page forward in time lt an operator that moves the screen one entry forward in time 00028 00026 shows the range o
222. t has terminated and the circuit is in its drip down period if any AK2 SC 255 Reference Manual RS 8D M1 22 Devt Defrost The circuit is undergoing a scheduled defrost Manual The circuit has been set manually on or manually off by means of the service screen Shutdown The circuit is in a scheduled shutdown The remaining fields are self explanatory Evaporator Settings Screen The settings screen reached by selecting the settings icon at the bottom of the screen shows and allows changes to settings for refrigeration and defrost US 04 2005 g MC Meat AA Settings Thermostat Target z4 0 F Range r 2z 0 F Defrost Termination f o0 0 F Drip Down 60 sec S2QHOBSE Evaporator Schedules Screen The evaporator schedules screen shows defrost schedule information and allows changes to number of defrosts duration and start times Evaporator Alarms Screen The evaporator alarms screen lists all active alarms for the circuit Evaporator Service Screen The evaporator service screen is covered in RS 8D M1 22 AK2 SC 255 Reference Manual 175 Desf 2 5 Using the Communications Screens 176 Host Network Screen I O Network Status Menu Select Communications from the Main Menu and the Communications menu will appear O3 02 200 O1 14 26 FHM ost Network Internet rir E Too Network E Hessages a Modem Config FQ Printer Alarm Fhone I Alarm Internet Ly HH Mod
223. t of the screen deserve special explanation Now The present status of the alarm condition For system alarms mo dem I O comm Test Alarms etc the field will read Trip For alarms based on hardware points on off inputs sensor inputs etc the field will contain a value on off or the current sensor reading The value will always be outside the alarm limits Ack Indicates by Yes or No whether the alarm has been acknowledged or not If you select one of the alarms a screen with additional information for the alarm will appear 194 AK2 SC 255 Reference Manual RS 8D M1 22 The Cleared Alarms Screen The Alarm Status Screen RS 8D M1 22 O2 04ae1 PHI Type Name Addr Low oll Aif Dil Press AAL 01 7 Settings below 50 0psi for 5 minutes Occurred 07 24 98 01 55PM at 47 6psi Cleared Current Value 47 5 psi Acknowledge Routing Status PhijiDanfoss Mntrng Off2dros 01 55PM PhaeiDivision office Not Sent Phi Hot selected Pha Hot selected FHS Hot selected IPL Hot selected IPs Hot selected Printer Hot selected The type name time of occurrence settings and current value are repeated but in addition there is an Acknowledge button and a list of the dialout phone numbers The Acknowledge button marks the alarm as acknowledged Acknowledgment has the following effects 1 An acknowledged critical alarm will stop dialing out If a critical alarm is acknowledged before it has dialed out the first tim
224. t will appear with a default name which will at least temporarily be Unit n where n is the new total number of units up to that line There are instructions below on how to change the name l 14 14 PH No of HVAC Units o No of HVAC Units 6 No of phase loss monitors fl Wo of humidity sensors a a Wo of dewpoint sensors caer Stages Name Type Cool Heat Unit 1 ETU Setups oO 0 Unit Z AHU Setups oO E Unit 3 ETC Setups oO E Unit 4 aC4 Setups oO E Unit 5 CT 65 Setups oO E Unit 6 CT 1024 lt Setup gt oO T The fields in the HVAC Configuration Menu Evaporator Menu shown above on the right are as follows No of HVAC Units 0 to 45 The number of controlled HVAC units of all types in the store No of phase loss monitors 0 to 45 The number of phase loss monitors available for use by HVAC control A phase loss monitor can be used more than once No of humidity sensors O to 5 except that the combined number of humidity and dewpoint sensors cannot exceed 5 The number of humidity sensors used for control No of dewpoint sensors O to 5 except that the combined number of humidity and dewpoint sensors cannot exceed 5 The number of dewpoint sensors used for control Name Label field any 15 characters The name of the HVAC unit The field can be edited character by character put the cursor on the field press to change to edit mode then use the left and right arrow keys to move from
225. that has a meter config ured for demand limiting Level The priority for shedding under normal conditions Levels are shed in ascending order level 1 then level 2 and so on up to the highest level configured limited by the number of steps allowed Levels above the number of steps configured will not be shed unless the meter configuration is changed Since there are only up to ten steps loads assigned level 11 will never be shed It is recommended that loads which are not to be shed are left at level 11 the default value Emergency level The priority for shedding when the emergency genera tor is running If a load is assigned level O zero for either normal or emergency conditions the load will never come on under those conditions For lighting zones the screen entries are the same except that each relay will have its own level so there is first a setup menu listing each zone then a page for each zone listing all the relays for that zone Utility demand is monitored every minute Every minute the most recent n minutes AK2 SC 255 Reference Manual RS 8D M1 22 Devt are averaged where n is the width of the configured window 15 20 or 30 minutes If the average reaches the configured start shedding at percentage of configured maximum demand step one all lighting zones and HVAC units assigned to level 1 will be turned off After one minute when the average is calculated again if the demand is still above the config
226. the RTC nodes on the I O network for this SC 255 Remember that there can be only 45 HVAC units per SC 255 Any time an RTC node is changed or added the network must be re scanned and re initialized After addressing and re scanning put the cursor on the Init field and press ENTER The initialization process will take a few seconds with a success or failure confirma tion message appearing briefly across the bottom of the screen When successful configuration is complete Seasons 4 Smart Coil HVAC Unit configuration Smart Coil packaged HVAC systems manufactured by Seasons 4 Inc have some unique configuration requirements For these units select SC4 as the type on the Configure HVAC menu At left below is the SC4 menu At right is the screen for fan configuration 01 53 06 PH lofils 7002 f Configure ETU 1 f Configure 54 Unit 4 Fan Oe a a oU E 10 11 05 AM Motor delay time T1O sec Air Damper Monitor phase loss TYes Which phase loss monitor Mot configured i Cooling Alarms Shutdown phase loss TYes Shutdown on smoke detect 7h Shutdown on fire alarm Yes Ra Heating E Board Points R Dehumidi fy Motor delay time 5 to 255 The fan motor runs continuously at low speed When there is a call for cooling heating or dehumidification the fan switches to high speed after the motor delay set here elapses Monitor phase loss List box Yes No Whether or not a phase loss detector is to
227. the SC 255 will display the Refrigeration Menu left It lists the rack or racks that are partly configured If you want to change or add to the configuration of one of these racks move the cursor to the rack name and press ENTER The Rack menu right will appear In this example only one rack has been previously configured l r lrz z 11 24 30 AM bagre trigeration Ment Rack Suction Current Target Suction Groups mM Suction AA O O0psi O O0psi zy Evaporators Rack Overview Fa H Condenser m Rack Service Heat Reclaim Configure Back Receiver Receiver Suction Info Heat Reclaim Compressors my Alarms EG Cm ma Evaporators E Board Points H Condensers Fa Now select the type of information you want to supply We ll cover a typical cat AK2 SC 255 Reference Manual 13 ot Starting with a Completely Un configured AK2 SC 255 Navigation and making changes Entering numerals Entering labels Constrained fields egory right after we talk briefly about the other route configuration may take If the AK2 SC 255 you are working with has no refrigeration configuration at all select Refrigeration from the Main menu and the Rack Configuration menu will appear left The only selection which can be made from this screen is Add Rack Selecting Add Rack takes you to the Configure Rack Rack Info screen right l1 r lrz z Generate input fo
228. the controller by pressing the MENU key Here s the Main Menu M Refrigeration at Authorization HVAC E Store Info 7 Lighting AK Z 8SC255 Info Alarms Communi cations i Energy 4 Configaratiorn E Miscellaneous History Authorization Just Looking If you are just looking at information in the system you may not need to enter an authorization code before moving on depending upon the system owner s wishes The system may allow you to browse and look at the status screens or it may require an authorization code just to look If the owner has decided to tightly limit access to the system s information you will se a screen like this amp utherisation Enter access code to wiem RS 8D M1 22 AK2 SC 255 Reference Manual 157 158 Getting Authorized To Make Changes Danfesi You will need to enter the authorization code that theowner has given you in the space where you see the asterisk screensconfiguration by the system owner has If you re going to be making changes you need to enter a valid authorization code for the part of the system you ll be working with Valid codes should be obtained from the system owner Only one authorized user can have access to an SC 255 at a time Authorization has a number of levels an authorization code can be for the entire system or for refrigeration or HVAC alone To begin the authorization process select Authorization from the Main Menu This is the scr
229. the farther away the current value is from target If you select Neutral Zone here you will cause answer on inverter control on the second page following to change to None That will in turn lock this selection to one between Rate of change and Neutral Zone since those strategies apply to installations without variable speed fans If you change equipment strategies or select Neutral Zone in error first select Rate of Change here then go to the second page following and change Fan inverter control to the appropriate variable speed control either VO or VLT to restore the variable speed choices here Rate of change A control strategy that simulates PID control 99 0 to 150 0 0 0 to 9 9 If the ambient tempera ture is below setpoint minus range ramping will be by stages When ambient reaches setpoint plus range all fans will ramp together Target 0 0 to 500 0 for pressure sensors 0 0 to 200 0 for temperature sensors The value that the control algorithm will seek to maintain with the selected strategy Pump louver and sump settings The next page has settings for pump louver and sump control 03 05 16 PH Puan cutine ee eea 7140 psi Pup cutout a a e a T1LZO Opesi Louver control enabled Yes Louret SUE Ite 2242 26 ees 3 115 0psi Lourer rut out o ee 7105 0pei Enable sump control TYes Sump level emptry 2 2 20 0 Sump level full c c 90 04 Sump lewel top off 7 50 0 igo ed OF ai t
230. then no other controller can have an output at its Bd Pt address 1 02 sending Rec The value of the point is being received from another controller on the host network You must enter in the Bd Pt fields the Bd Pt address of the sending point Bd Pt First enter the address of the RO board and point to which the load is wired or in the case of a received broadcast point enter the board and point address of the sending point On List box Voltage The point will be read as ON if it senses a voltage It will read OFF when it senses no voltage No Voltage The point will be read as ON if it senses no voltage It will read OFF when it senses voltage Latching The point will be read as ON when it first senses a momentary voltage It will continue to read on when the voltage is no longer present The point will read OFF after voltage is applied again This setting is often used for push button or other momentary contact sensing Closed The input is on an AK2 I O module based on a universal input The input is on when continuity is sensed at the universal input s terminals This is similar to the reading of a closed dry contact input Open The input is on an AK2 I O module based on a universal input The input is on when no continuity is sensed at the universal input s terminals This is similar to the reading of an open dry contact input SORT At the bottom of the body of the screen above the icons on the same line as PG DN
231. tion Status screen select the Settings icon the fourth one from the left and we ll see how settings are changed Here is the Suction Settings screen Settings Suction Control Suction Safety Setpoint LlzZ O0psi Cutout 4 psi Max Float 4 0psi Discharge Safety Cutout 325 0psi Cutin 2 75 0psi Float Suction On 4FC l x Temp Target z 2 5 0 F Address 1 Fange Za mei Reaction Time Inverter Speed Compressars 5 Minimum 50 0 Unloaders 5 Maximum LOO 0 Inverter ae 1 8 AER HEB SE Notice that on the icon menu the suction icon is no longer in reverse video but the settings icon is As we did to see the compressor screen we leave the menu by pressing the UP ARROW which moves the cursor to the topmost changeable field on the screen the Setpoint field Now if you are authorized at the Refrigeration Settings or Refrigeration All level or above you can change the values of the settings To change a numeric value press the EDIT key to toggle to edit mode then simply key in the new value from the keypad At your PC right click on the field and type from the keyboard Remember that if a field has a decimal point you must enter a digit even a zero for each place to the right of the decimal point When AK2 SC 255 Reference Manual RS 8D M1 22 Changing List Fields Changing the From and To times RS 8D M1 22 Devt you have entered the correct value press EN
232. tion Suspends alarms When you answer yes to this question another line will appear beneath it asking you to specify a time period from 1 to 255 hours during which no alarms will occur effectively all alarms are disabled RS 8D M1 22 AK2 SC 255 Reference Manual 197 2 8 198 Danfesi Overrides An AK2 SC 255 system provides for overrides through service screens the reset switches on RO8S boards the Manager s Override box and the keyswitch override Overrides Using Service Screens A typical service screen is the one for relay output boards There is a similar screen for on off input boards Seryice Autor Manual Relays Autor Manual Inputs Sensor Adjustment Maintenance Hours Ba Pt Locations Suction Pumpdown Charge System DIEDE The first three menu items can be used to override control The Auto Manual Relays screen might look like this Service Manual Operation Relays Compressor AAT Aute On Dnleoader AAA Auto On DTnleader AALTb Manual On QTnloader AAT Manual Off Unleoader AAITd Auto On Oil Reset AAL Aute On Inv Reset AAT Auto On Iny Bypass AAT Aute On Reset DIEDE AK2 SC 255 Reference Manual RS 8D M1 22 Overriding Sensor Values Overrides Using ROSS switches Output LED s Overrides Using the Devt Each relay output shows a mode either Auto Manual On or Manual Off All the relay outputs in Auto mode also show what the state of the relay is eith
233. tions specified in the alarm routing screen Critical When the alarm occurs it will be communi cated beyond the SC 255 multiple times to each destination defined in the alarm routing screen at the interval set in the alarm routing screen from 10 to 99 minutes the default is every 10 minutes lt Delete gt The alarm settings will no longer appear on the screen for temperatures 999 9 to 999 9 for 0 to 999 9 The level at which the alarm timer begins As long as the value remains beyond the alarm limit the timer will continue to accumulate Whenever the value falls within the alarm limit the timer will be reset to zero 0 to 999 The number of minutes that must expire with the alarm value beyond the trip value before an alarm occurs Whenever the value falls within the alarm limit the timer will be reset to zero Note The contents of the second page of the condenser configuration screen will depend on what type of condenser control is chosen on the first page AK2 SC 255 Reference Manual RS 8D M1 22 Devt Condensers are configured by selecting Condensers on the Configure Rack menu and can be either air cooled or evaporative the two types have very different screens At top center below is shown the condenser screen when you first open it and at lower left is shown the same screen after Air Cooled has been selected as the type and before changes finally at lower right below is shown the configuration screen for
234. to which alarms are to be sent The IP address is assigned by your network administra tor The address is composed of four one two or three digit numerals separated by periods None of the groups can be a number greater than 254 or less than 1 The address required is an IP address and is the address of the ethernet node to which alarms are to be sent The IP address is assigned by your network administra tor The address is composed of four one two or three digit numerals separated by AK2 SC 255 Reference Manual RS 8D M1 22 Alarm Routing for Ethernet RS 8D M1 22 Devt periods None of the groups can be a number greater than 254 or less than 1 The Delay is the amount of time between attempts to dial out an alarm Before any alarm will be dialed out a schedule must be active Note also that holidays must be specified in the schedule 1 2 3 etc and defined in the Store Info Holidays screen or they will not be an effective part of the schedule It is also necessary to set up alarm routing for alarms to an ethernet node From the Main Menu select Configuration Alarms Routing then enter the applicable informa tion Alarm Routing Class Network Fhone Local l 34 Legs OAR FENM Syst ei He AA 1 Back psi ac es TESS Back 0 a a e A ears ae Case a ie a a Z HVAC FSS 2 il Misc Be ee ao T al Burglar a aoa 3 Fire Se BE SRT 3 Network j Phone Numbers liMaintenance Wet Llidanfoss M
235. to 60 Not present when dessicant wheel is configured The number of minutes that must elapse after target plus range is reached before the stage will come on There is one field for each stage 0 to 60 Not present when dessicant wheel is configured The number of minutes that must elapse after target minus range is reached before the stage will be turned off There is one field for each stage 0 0 to 100 0 If zone temperature is below this limit dehumidification will be disallowed Monitor outside humidity Yes Night setback c22 tees T Yes Night setback offset 7 0 F Override switch Wo Num of schedules eel PG DM for more Fan speed List box Low Speed High Speed The fan speed 74 AK2 SC 255 Reference Manual RS 8D M1 22 Devt during dehumidification Monitor outside humidity List box Yes No Whether or not to monitor outside humidity on status screens for this RTU Monitor wheel rotation List box Yes No Present only when dessicant wheel is configured Whether or not the dehumidifica tion target is to be raised by an offset next line Night setback List box Yes No Whether or not the dehumidifica tion target is to be raised by an offset next line according to a schedule or schedules on the next page s Night setback offset 0 0 to 100 0 The amount by which the dehumidifica tion setpoint set on previous page is to be raised during night setback hours as set on the following
236. to insert a new line presents itself 11 12 2002 11 0502 CFG L1fl2 2002 11 0502 CFG ES Configure Ca Ol ii Configure Ca Ol Units DI ndo Cancel Units of ndo Cancel Style Generic Style Generic a Definition Current Value f Errori 7 On Current Value f Errori 7 On Now press ENTER and the new line appears On the new line create argument SI3 an SI ppm and define it by selecting the second miscellaneous SI we created Compr Rm Leak Finally insert another new line and create argument NUM4 for the 500 ppm leak setpoint and data definitions are complete When evaluating the logic in the rules area the controller will go line by line in the rules area and stop at the first statement that it finds true We want the OI to be AK2 SC 255 Reference Manual RS 8D M1 22 Devt normally off but to be on whenever the temperature SI1 is equal to or greater than 90 F Num2 OR whenever the leak sensor SI3 is equal to or greater than 500 ppm Num4 Writing rules Notice that SI1 already appears in the rules area on the first line We could change it if we wanted to any of the other three arguments we have defined but it is exactly where we need it Notice that there are several blank spaces to the right of SIL These alternate be tween arguments and operators Put the cursor on the first blank to the right of SI1 and open the list box fl2 Foo7 11 0502 03 56 42 FH flz2 2002 11 0502
237. to max opening AK2 SC 255 Reference Manual 50 0 to 100 0 The temperature you want to maintain at the zone sensor 0 to 60 The number of minutes that must elapse after target plus range is reached before the analog valve will open 0 to 60 The number of minutes that must elapse after target minus range is reached before the analog valve will be closed List box Yes No Whether or not auxiliary heat is to be locked out during hours when setback is effective List box Yes No Whether or not heat is to be locked out based on ambient temperature 0 0 to 100 0 Auxiliary heat will be locked out above this temperature plus range next line Heat will be allowed on again when ambient temperature has fallen to lockout minus range 0 0 to 999 9 The range selected creates a dead band around the lockout temperature Heat will be locked out at lockout temperature plus range and once locked out will be allowed on at ambient lockout minus range 0 0 to 100 0 The percentage of valve opening when ignition occurs 1 to 20 The number of minutes the valve will be maintained at low fire duration before beginning to modulate 50 0 to 100 0 Sets the maximum valve opening allowed 0 0 to 75 0 Sets the maximum valve opening al lowed 0 to 6 The number of degrees of rotation of the valve spindle from minimum to maximum percentage RS 8D M1 22 RTU dehumidification configuration Begin by selecting Dehumidify from the Config
238. tons for 3 seconds When the Degree Master enters the service mode the display will change to RS with an up arrow on the left and a down arrow on the left Pressing the lower button will now activate the service pin The down arrow will change to an asterisk as confirmation Be careful not to press the upper button Doing so will reset the Degree Master After the Locate procedure Select Init and press ENTER or click with your mouse The initialization procedure during which configuration data 1s copied from the AKC 55 to the Degree Master will take about 10 15 seconds Wink All Degree Master is a toggle first ENTER turns on second turns OFF that will cause all the Degree Masters on the network to flash their node numbers repeat edly If a unit does not wink its number test its function with the handheld remote control in accordance with the Degree Master manual If the unit is functioning to control the fixture troubleshoot its network connection and addressing To configure Board amp Points for Danfoss VLT and AKD variable frequency drives select the variable speed drive icon fourth from the left on any Configure Board amp Points Other Controllers screen and press ENTER The screen looks like this though you see only one here all configured VLT drives will be listed AK2 SC 255 Reference Manual 61 10 10 2002 YLT Comp AAlL gt Locatest E The fields and contents are Name Label field any 15 characters
239. ture alarms ccccccccccccscssssssssssssessessesseseeeeceeeeeees 200 2 9 Using the Audit Trail csscucsecececdecvesecnsnascwaepanesceewesendsusmsecenwucsandoueticaucbasescucaxseiswisioenselowes 200 202 RS 8D M1 22 AK2 SC 255 Reference Manual AK2 SC 255 Reference Manual RS 8D M1 22 PART ONE Configuration 1 1 Initial Configuration Battery Authorization codes RS 8D M1 22 Note We use the formal type designation AK2 SC 255 occasionally in this manual but most often you will see the short form of the name SC 255 Configuration of an AK2 SC 255 is easy using the keypad and display and even easier using Danfoss AKA 65 Network Interface software running opn a PC con nected to the controller This chapter describes configuration from the AK2 SC 255 keypad You can easily adapt these instructions for the PC keyboard and mouse after reading Chapter 3 Using AKA 65 Software on Your PC We will address configuration of each area of a supermarket control system in this section of the manual Initial configuration for equipment start up may be limited to such items as are necessary to check out the mechanical equipment or provide basic service The configuration can be changed or added to at any time later The unit s backup battery power is automatically enabled when the unit is first externally powered Note that if you receive the unit partially configured the battery will have been enabled Normal
240. uages can be in either psi or bar for pressures in either celsius or fahrenheit degrees for temperature and in either footcandles or percentage for fotocells The time value field will accept any numberal from 0 to 9999 and the time unit can be seconds minutes or hours If you wish try disabling one of the alarms just configured or any alarm you have set up Then restore the alarm to the Log Only Normal or Critical action level The default settings will not appear but rather the settings you configured This feature can be useful when you need to suspend only a few alarms on a rack Remember though that the alarms will not automatically return to enabled status as do alarms suspended with the Suspend Alarms function on the service screen see chapter 5 2 The configuration process for refrigeration HVAC and lighting allocates alarms for every configured digital and analog sensor and for each control output Depending on your needs not all alarms will be useful FAQ 1 How do I determine what trip levels to use for high and low suction pressure alarms Start by considering the target pressure that is configured for the rack Know the range of pressures that the rack will operate in when loads product temperatures defrosts and other factors are working correctly Then set the alarms at the upper high pressure and lower low pressure limits of that range Start with conservative settings If your settings are too tight on one
241. units minutes can not be changed The alarm types are High zone temp Occurs when zone temperature is above a set temperature 999 9 to 999 9 for the specified alarm delay Low zone temp Occurs when zone temperature is below a set temperature 999 9 to 999 9 for the specified alarm delay No Airflow Occurs when zone humidity is above a set percentage the field takes values from 999 9 to 999 9 for a period of from 1 to 9999 seconds minutes or hours Phase Loss The ClimaTECH controller has a digital input to sense signals from the HVAC system s phase loss detector This alarm occurs when the phase loss input has sensed a phase loss for the specified alarm delay of from 0 to 100 minutes Inverter failure The ClimaTECH controller has a digital input to detect failure of the HVAC system s inverter if the system is a variable speed unit This alarm occurs when the inverter has been called for for the specified alarm delay of from 0 to 100 minutes and proof has not been sensed Fire The ClimaTECH controller has a digital input to detect the HVAC system s fire alarm This alarm occurs when the fire input has been ON for the specified alarm delay of from 0 to 100 minutes HVAC fire if an HVAC fire stat is configured A digital alarm from the AKC 55 that can be enabled to occur when a fire stat monitor reads on for a specified time period 0 9999 seconds minutes or hours This alarm is separate and distinct from the
242. uration you will be able to make changes by several different avenues which are discussed in Chapter 5 Using the System To select from any SC 255 menu first use the arrow keys to move the cursor to the item you want then press the ENTER key You can use the EXIT key to retrace your steps level by level Before using the system you may wish to change the language used on the screens the units used for pressure and temperature or the date and time format These settings will be for the local PC only and will not affect the displays of any SC 255 in the system To change the displayed units select Store Information from the main menu and then choose Units Languages In the Configuration Units Languages screen select the language you want to see in the controller screens then select either psi or bar for pressure either F or C for temperature and either or fc footcandles for light level AK2 SC 255 Reference Manual RS 8D M1 22 Devt 1 2 Configuring Refrigeration Starting with a Partially Configured AK2 SC 255 RS 8D M1 22 There are two routes you may need to navigate to begin configuring refrigeration One begins by selecting Refrigeration from the Main menu and the other by selecting Configuration If the AK2 SC 255 you are working with was supplied with a rack the controller may have been partially configured by the rack manufacturer In that case when you select Refrigeration from the Main Menu
243. ure RTU menu ES Configure ETU 1 Dehumidi fy R Dehumidification type Cooling Eclm heat during dehumidMo Aux heat during dehumid 70E Control temp sensor TaAveraqge Jeet gin he oe Oe eae ee E 7 S0 0 F Target differential eon FE Pre delay for stage fl 1l min 2f 1l min Fost delay for stage l min F f min Cooling low limit 7 68 0 F PG DN for more Dehumidification type List box None Cooling Dessicant Whl The type of dehumidification used Rclm heat during dehumid List box Yes No Whether or not heat reclaim is allowed during dehumidification Aux heat during dehumid List box Yes No Whether or not auxiliary heat is allowed during dehumidification Control dehumid on List box Humidity Dehumidification will be controlled based on a specified humidity target A humidity sensor is required Calc nDew Dehumidification will be controlled based on a specified dewpoint target which will be compared with a dewpoint calculated from inside zone temperatuare and humidity Both zone temperature and humidity sensors must be installed Inside Dew Dehumidification will be controlled based on a specified inside dewpoint target An inside dewpoint sensor is required Calc OutDew Dehumidification will be controlled based on a specified dewpoint target which will be compared with a dewpoint calculated from outside temperatuare and humidity Outside temperature and humidity senso
244. ured percentage of configured maximum demand level two will be shed and so on When demand has dropped to the start restoring at level the last level shed will be restored and then the others in descending order so that the last load restored will be the one which was shed first Restoration will continue as long as the load remains below the start shedding at percentage 1 5 Configuring Alarms Whenever you enter configuration information to program a given SC 255 system standard alarms are automatically created in the program These alarms are skel eton in nature This means that the alarms are now allocated in the program but you should inspect the alarm actions trip levels and time limits for each alarm and adjust them accordingly to meet your unique requirements We will discuss in detail how to configure alarms for Refrigeration HVAC and other points and sensors then we will see how these alarms are routed through the system The Configure Alarms menu First become authorized then from the main menu below left select Configura tion and then from the Configuration menu select Alarms You will reach the Alarm Configuration Menu shown below There are other ways to reach an alarm configu ration screen and as you become experienced with the system you will learn them For instance if you are configuring refrigeration alarm configuration for the particu lar rack you that you are working with
245. us alarms on any point in the network Miscellaneous alarms are covered later in this section If a standard alarm is based on an on off input you can change the alarm action setting and the time setting The time setting can range from 1 255 seconds minutes or hours For an alarm based on a sensor input in addition to the action setting and time setting you can change the sensor level For the second alarm in the screen shown the sensor level could be anywhere in the range from 999 9 to 999 9 psi Configuration of system alarms which concern operation of the controller and network will be covered in a later section of this manual To configure board amp points information for refrigeration return to the Configure Rack menu put the cursor on Board amp Points and press ENTER The screen is as shown below For AK2 module board amp point configuration refer also to the AK2 I O user manual AK2 SC 255 Reference Manual RS 8D M1 22 Devt Navigation Notice that at the bottom of each of the Board amp Points screens there is a row of icons Select one of these and you will be taken to the Board amp Point configuration page for a particular type of input or output From left to right the icons represent the following Board amp Points Relay outputs Digital outputs Name Beast RS 8D M1 22 Digital outputs relay outputs Analog inputs sensor inputs Digital inputs on off inputs Analog outputs variable outputs
246. usdeieucaneuimsanaceimessincteats 56 Board amp Points other controllers case controllers VFDs etc that are on the 255 network 57 62 AKC VOX circuis DOA A PONS essen A possoaenaasatonesiaaes 57 Network re scan and TIA AO hoes ahaa aaeiue hs aa aeiae a aa e aS EAE 58 NV Gon A E E E 58 PECOT DOn T a E E E E E E E E 58 60 Network re scan and initialization i lt c0ssscessiarecasaionssiainenbaraientascbotacaedscadudenssenteinasdnmessaantaaaeasensoiaes 59 60 O E E E E E E sage dv ee EN E T E ET 60 Degree Master Doard amp POMS srssssareie eotsesnsespesumsnesuxextarertaganemannieessncesueraresess 60 61 TSS CS saat ee E E A E A E 6l Ac vatn theservice pin from the display cnczasasscmucnastecnnsazersniscannatedenassaniseedicameapateaeatacenemoescenacett 6l JEEE 10A ET e i EEE A E E E EN A A E E AEA E 6l A e eee eerste E E pass E E E E E EE E 6l VLI and AKD drives Doard Co POINIS sess steseaicnactpnanedse cvseae cisesennecesens EEEE E EE 61 62 TDC Ci Cuts WO at Ce POS css E 62 Configuring HVAC cca seeps re a cmc oe eee ane ee eaten mennenm nnna 63 113 Introduction 63 64 RECCO O a E 64 76 RTO On O O E E T E A E E 64 66 RTO Coine coni orai O eE E 66 69 RIU heanas conio miad ON ssa a e S E E 69 72 RTU dehumidification configuration s5 1 c0 ccansresewrsensourosanebbarnerbasalasesaaunanuntedsiuntadsaneonsaaneunpianeusaiaaaes 72 75 RIU ar damper confi curaio sesasi aeaa a aaa Aeae E e aenta 75 76 RUA Oi LO e E 76 RIU bo
247. usses interface to software not published by Danfoss the accu racy of the text is in some cases dependent upon information furnished by the manu facturers of such non Danfoss products and Danfoss cannot be held responsible for the accuracy of Ithe information Nevertheless we have made every effort to ascer tain correct information from all parties invol Copyright 1999 2003 2004 2005 Danfoss Inc All rights reserved At Danfoss continuous improvement to documentation goes hand in hand with the product refinement and quality for which Danfoss is justifiably world famous We welcome your suggestions for additions or improvements to any of our manuals or other literature Please address your comments to RS 8D M1 22 Danfoss Inc Literature Department 7941 Corporate Drive Baltimore MD 21236 4925 Telephone 410 931 8250 FAX 410 931 8256 AK2 SC 255 Reference Manual 3 Table of Contents PARTONE Configuration 1 1 initial Configuration icc ecco innana a aE a aaa aa aii 11 12 CROCCO ape teeter E E E E E E E E E eee ceasteenareccateats 11 BDUD E T A E II AUNONZAUON COOC ao ste n eceneerscene ee S T E EE E aun veepeactanocuseetucrvece cee 11 12 Ueno Nome e E ET 12 Selechon of units and lan WA CS sayesin ana e E Ea 12 1 2 Configuring Refrigeration cccccccsssseeesssssseessceeneeeseeenseeeeeeesseeseoenseeeseoesseeeseoonseees 13 63 Starting with a partially configured AK 2 SC 295 cssies sessscnscrpadidonn
248. utput at its Bd Pt address 1 02 sending AK2 SC 255 Reference Manual 51 Board amp Points Sensor inputs Analog inputs Bd Pt SORT Name Devt Rec The value of the point is being received from another controller on the host network You must enter in the Bd Pt fields the Bd Pt address of the sending point First enter the address of the RO board and point to which the load is wired or in the case of a received broadcast point enter the board and point address of the sending point List box N Closed The load on this point is wired through its normally closed contacts N Open The load on this point is wired through its normally open contacts At the bottom of the body of the screen above the icons on the same line as PG DN for more is the SORT field By default sort mode is on and entries will be sorted by Bd Pt address if sort mode is turned off points from then on will be listed in order of creation The sorting occurs when you press EXIT and will be apparent the next time you enter the screen 1LO 10 2002 O4 17 07 PH eee el Board Points iJ Sensor Inputs Name Beast Ed Pt Type Inside Temp Mo 00 PT1LOOO Disch Press A Mo 00 0 ARS 32 500 Dropleg Temp A Mo oo o PT1LOOO Cond Sump Lvl A No oo o EMHS 3 Inlet Temp Mo 00 PT1LOOO Liquid Lvl Mo 00 0 0 5 oles Hotwater Al Mo 00 PT1LOOO Hotwater Az Mo 00 0 PT1LOOO SORT On PG DN for more i El H g Label field any
249. v Reset AAl off Offline ols Inv Bypass AAL O Offline al Oil Pump O Offline DETE Oil Fan A WEE Offline Oo2 3 Compressor AAZ O Offline oz 4 Oil Reset Ads et Offline SORT On PG DH for more ak aE The fields and their contents are as follows Bd Pt The address of the RO point to which the load is wired or in the case of a received broadcast point the board and point address of the sending point The addresses may be in the form nn n or in the form nn n n These formats indicate respectively AK2 SC 255 Reference Manual 177 Donfsi points on prior generation AKCESS I O boards and points on second generation ADAP KOOL modules AK2 modules Name label field 15 characters any The name of the load connected to the point in this case a digital output relay output Value On Off The current value of the point Status label Indicates whether or not the point is in com munication with the SC 255 Online The point is communicating Offline The point is not communicating Send Relay outputs sensor inputs and on off inputs only The point is sending its status Receive Relay outputs sensor inputs and on off inputs only The point is receiving its status SORT List box On Off At the bottom left of the body of the screen above the icons on the same line as PG DN for more is the SORT field By default sort mode is On and entries will be sorted by Bd Pt address If sort mode is tu
250. ways appear as in the illustration above whether the input is used or not List field one for each point Yes The input is configured It should be wired if this answer is given or the configuration should be AK2 SC 255 Reference Manual 91 Devt changed No The input is not configured Its state can not be used by the controller Rec The input value is to be received from another node other than this RTC board on the I O network The board and point that is broadcasting the state of the input must be given in the next column AK2 SC 2 55 Bd Pt Address field If the input state is received from another node on the I O network enter here the address of the point that is to be received In the lower half of the screen the SC 255 Inputs Name Label field not changeable The name of the point The RTC board s software can only use the listed inputs from the I O network The names always appear as in the illustration above whether the input is used or not Beast List field one for each point No The input is not configured or its state is not to be used by the controller Rec The input value is to be received from another node other than this RTC board on the I O network The board and point that is broadcasting the state of the input must be given in the next column On List field Voltage The input state will read ON when the point senses voltage No Voltage The input state will read ON when the point
251. when ON will turn off all stages of cooling in the RTU None There is no freeze protection to configure Setpoint 0 0 to 50 0 The temperature as measured by the sensor input indicated above at and below which a stage of cooling will be turned off Night setback List box Yes No Whether or not the cooling setpoints are to be raised by an offset next line during AK2 SC 255 Reference Manual RS 8D M1 22 Night setback offset Override switch Override duration Num of schedules RTU Heating configuration rooftop configuration menu iH Number of Controlli Num of he Configare ETU Devt scheduled times next page when cooling require ments are not as critical for example when the building is closed 0 0 to 50 0 The amount by which the cooling setpoint set on previous page is to be raised when night setback schedules next page are in effect List box Yes No Whether or not there is a switch to override night setback 0 to 1439 The number of minutes after activation of the override switch that night setback will be overrid den 0 to 8 The number of cooling night setback sched ules Schedules are entered on the following page s reached by using the PG DN key Heating configuration for rooftop units begins with selection of Heating from the 09 04 56 AM Heating Ra 1 Zone sensors 7f ng sensor at relm stages 71 Target temp stage 1 3 72 0 F Pre delay Omin Post del
252. when one of these schedules is true Up to three standard schedules can be set up In order to activate the schedule it is necessary to toggle the field reading Not Used to Standard Then the schedule settings will appear and can be changed as needed Now go back to the main menu and select Alarms Configuration Routing then select the categories of alarms you want to go to the printer You must also go to the field labeled Printer in the lower half of the screen and enter the address of the AK2 SC 255 to which the printer is attached RS 8D M1 22 AK2 SC 255 Reference Manual 183 184 Donfsi Modem Configuration From the main menu select Alarms Configuration Modem Answer Yes where the screen asks if you want to configure a modem for the unit and the modem configuration fields appear as in the screen below Eaud Line Type Parity Ue ee a r i KOpenFASe EX 2z COME le Custom 4 23 Boaboatics Disconnect eE i BEEEEE Any of the modem settings can be changed from this screen Make changes with care because incorrect modem settings can keep the system from communicating The individual fields are as follows Modem Baud Line Type Parity Data Bit Stop Bit Use Modem on AKC 55 Address Disconnect Method The type of modem All supported options are listed When you select one of the custom modem types a field will appear allowing you
253. will be available from the Configure Rack menu likewise HVAC and other configuration screens will present an alarm selec tion Using the method just described though you will be able to reach the entire world of alarms from one menu The Alarm Configuration menu looks like this 09 47 10 AM RS 8D M1 22 AK2 SC 255 Reference Manual 121 122 Configuring Refrigeration Alarms Desf If you select Refrigeration from the Configure Alarms menu you will be presented with a screen listing each configured racks as at left below Select one of the racks and the alarms menu for that rack will appear as at right below o4 o7 2003 Oo4 07 7 2003 Suction Rack C Compressors EG EJ Pa Circuits Condenser Other Bitzer We will select Rack C and another submenu will appear listing all the different parts of the system for which we can configure alarms Note the last item on the menu at right above Bitzer This appears only because when the compressor data was configured Bitzer was selected as the answer to the proofing type question Keep in mind that as we proceed through alarm configuration the items that present them selves depend upon the configuration for the mechanical devices Select Suction and the first page of configuration for actual alarms appears o4 O7 2003 10 00 12 AM alarms Type Name Address Alarms Suspended Hack C E Fhase Loss Phase Loss C o8 1 D
254. with a table of standard values Maintenance Hours The Maintenance hours service screen maintains Total Run Hours for each device or lighting zone since its first start after configuration and Maintenance Hours a counter that you can reset to zero using the lt Clear gt button at the bottom of the screen The date of last clearing is also displayed Service Haintenance Hours tet m fa Compressor AAL Total Pun Hours 0 Haintenance Hours oO Last Cleared O3 02 05 Clear BERR EEG oe Bd Pt Locations This screen is identical in function to the Board amp Points screens described in Part I Section 1 2 Configuring Board amp Points RS 8D M1 22 AK2 SC 255 Reference Manual 167 Danfesi 2 3 Using the Smart Case Controller Screens The AK2 SC 255 has special screens which allow you to examine many functions in each of the fixtures where Danfoss Smart Case Controllers are installed Begin at the status screen for a Smart Case fixture Status Addr 1 AEC 164 Normal Operation we OS Case z S 0 F Valve KVQ Target 10 0 F Fans Auto On Lights Autoa On Drain Open Disch A S 1 F Defrost Ff 1 F Terminate 50 0 F Sched Def 3 Time Wed 09 53 AM PG DN for more Bee Ree oA Operation Successful The first line of the screen body shows the fixture s current status This field may contain any one of the following Normal Operation The Smart Case Controller is operating the
255. xtent on the way rack configuration questions were answered Listing all the types of suction group alarms they are Alarms Suspended As explained above when this alarm is enabled it will occur whenever alarm suspen sion for the suction group is activated in the service screen see chapter 5 2 There is no time delay Phase Loss if a phase loss sensor is configured A digital alarm that can be enabled to occur when the phase loss sensor is on for a specified time period 1 9999 seconds minutes or hours Low Pressure if a suction pressure sensor is configured An analog alarm set for a pressure from 999 9 to 999 9 psi or bar and a time limit of from 1 to 9999 seconds minutes or hours High Pressure if a suction pressure sensor is configured An analog alarm set for a pressure from 999 9 to 999 9 psi or bar and a time limit of from 1 to 9999 seconds minutes or hours Low Temperature if a suction temperature sensor is configured An analog alarm set for a temperature from 999 9 to 999 9 psi or bar and a time limit of from 1 to 9999 seconds minutes or hours High Temperature if a suction temperature sensor is configured An analog alarm set for a pressure from 999 9 to 999 9 psi or bar and a time limit of from 1 to 9999 seconds minutes or hours High desuperheat if a suction temperature sensor is configured An analog alarm set for a pressure from 999 9 to 999 9 psi or bar and a time limit of from 1 to 9999 seconds minutes
256. y by a Danfoss trained techni cian RTC schedules The RTC schedules screen s allow entry of schedules for operation of the rooftop RTC alarm configuration Alarms can be for any of the following in accordance with the Appendix on alarms Sensor discard Power failure Filter elapsed Filter runtime HVAC smoke for this unit s smoke detector HVAC fire for this unit s fire detector Sensor alarms can be set for any of the zone or humidity sensors for any relay output or for any digital input on off input RTC I O Points configuration These are configured in a manner unlike the Board amp Points entries for other devices Select RTC I O Points from the RTC configuration menu and the first screen Relay Outputs appears 04 47 21 PH Confiqure BTU I O Points Belay Outputs Point Nane Or I Fan W Open Z Economizer W Open 3 Cool 1 W Open 4 Cool 2 W Open 5 Cool 3 W Open 6 Heat 1 W Open 7 Heat z W Open a Heat 3 W Open ARORE ae Notice the set of icons across the bottom of the screen These will allow you to reach RS 8D M1 22 AK2 SC 255 Reference Manual 89 Devt the other configuration screens and to initialize the RTC From left to right the icons represent Relay Outputs digital outputs Sensor Inputs analog inputs On off Inputs digital inputs Variable Outputs analog outputs and finally RTC Controls RTC Address and Init Configuring RTC I O Relay Outputs Here are the fie
257. y to each level Each level can have from 1 to 66 accounts When you inspect the audit trail discussed in Section I Using the Ssystem you will be able to determine for each system access which specific account was used for access and exactly what changes if any were made Notice that you can also set the language s for the audit trail AK2 SC 255 Reference Manual RS 8D M1 22 Devt Configuring units and languages The units for pressure temperature etc are configured by selecting Store Info from the Main Menu then Units Languages This is the screen that displays Nese We if Units Languages Pressure asl Temperature F Date HMH DD YY Time 12 Hour Language English Light Level percentage SSS The fields are these Pressure List box PSI bar Temperature List box F C Date List box four date formats are offered Time List box 12 hour 24 hour Language List box English Spanish Portuguese German Chinese Japanese Light level List box percentage foot candles RS 8D M1 22 AK2 SC 255 Reference Manual 155 156 AK2 SC 255 Reference Manual RS 8D M1 22 PART TWO Using the Status Screens and Service Functions Using an AK2 SC 255 system is simple and is best learned at the controller or by using AKA 65 Network Supervisor software to examine a real system Everything starts at the Main Menu You can get the Main Menu if it isn t the screen you see on

AK2-SC 255 Reference Manual (April 2005-LU)

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