User`s manual AKC 165 Subcooling Controller
Contents
1. AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 Configuring an AKC 165 Note In the discussion that follows familiarity with navigation in the rack controller either an AK2 SC 255 or an AKCC 55 is assumed If you need a refresher refer to the section Authorization and Navigation on pages 13 and 14 Get your authorization code from the system owner s representative The AKC 55 evaporator screens AKC 165 s are configured from their host rack controller First enter your authorization code and account number Then from the Main Menu select Configuration Refrigeration Rack xx the one the AKC 165 is connected to then Evaporators This is the screen you will see 15 08 14 Suction AA a Evaporators No Circuits 1 Dewpoint method Calc Dewpt Humidity sensor to use Inside RH 1 Name Type Circuit AAl gt Setup lt Increase the number of evaporator circuits by 1 Select AKC 16x in the Type field for your evaporator then select the gt Setup lt field for the your new subcooling circuit and this screen appears AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 Type of ARC ccsccesces Fixture Name Enter user defined name Subcool Target Based On TOP GOs eles Ss Sioid celeste es Bees Use Suction Pressure Use Discharge Pressure SubCool B Liq Delta Select AKC 1652. A system involving two racks one medium and one low temperature The medium temperature rack supplies subcooling for the low temperature cases b A system involving a single rack of screw compressors where the warm gas from the subcooling circuit is returned to a mid stage suction port economizer port System A System B Low Temp Med Temp Condenser Condenser j 1 v I 3 Sys Liquid 2 Gas Dischar
3. Store Info then Daylight Savings The Month field under Spring Forward is a list field This is a list field To change the contents of list fields From the rack controller keypad Put the cursor on the list field and then press the key A list box will appear and you can use the up and down arrow keys to choose one of the months When you have selected the correct month for your geographic region press the ENTER key to save the new informa tion From your PC Double right click with your mouse on the list field and a list box appears then right click in practice a double right click and a list box will appear You can chose an an item from the list box with your mouse or use the arrow keys on your PC keyboard to move your chosen item to the highlighted field When the highlight is on the item you want left click on it or press ENTER to save the new information SMvaylight Savings Status Enabled SpringFebrward Fall Back Month Oct Sun Day Last Sun Time 02 00 Month Bushs Day AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 17 Danfoss Inc Air Conditioning amp Refrigeration Division 7941 Corporate Drive Baltimore MD 21236 4925 Telephone 410 931 8250 Fax 410 931 8256 Direct order fax 800 948 3123 Danfoss shall not be responsible for any errors in catalogs brochures or other printed material Danfoss reserves the right to alter its products at any time wi
4. target may vary according to mass flow and the physical properties of the refrigerants in the two circuits some trial and error adjustment is likely to be needed before the best settings are found AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 12 AKC 165 Service screens From the Status or the Settings screen Select the service icon the fourth one from the left at the bottom of the screen and the main service menu will appear SubCool B AAL Service Addr 0 Manual Operation AKC 16x Shutdown Verify Sensors Manual operation Select Manual Operation and this screen appears SubCool B AAl Service Addr Manual Operation Valve Manual Value 0 From here you can override the AKC 165 and put the electronic expansion valve into manual operation then select a manual opening percentage for the valve RS 8B E2 22 AKC 165 Subcooling Controller 03 06 1 084R9896 13 Shutdown The second choice on the service menu is Shutdown which will lead to a screen that allows either normal refrigeration normal subcooling operation or shutdown Service Addr 0 AKC 16x Shutdown Status mormal Refrigeration Verify sensors The third choice on the service menu is Verify Sensors Service Addr 1 Sensor Adjustment Name Current Offset System Liq Out 18 9 F 0 Obey Liq in 13 2 F O 0 F Gas out 66 1 F O 0 F There is a list of all the sensors used
5. 13 02 Local H PRREE I PRREEE With an authorization level of View Only you will be able to look at current alarms and settings but you will not be able to acknowledge alarms or change settings To become authorized at a higher level enter your authorization code press ENTER the highlight will move down to the account code space enter your account code press ENTER The bar at the very bottom of the display will read Access accepted when you have correctly entered a valid code and account number After several minutes of inactivity the access level will revert to View Only The lower part of the authorization screen shows the most recent entries to the system giving the audit trail numbers date time and point of entry along with the authorization level that was used for each In the screen shown above all of the entries were made by someone at the supervisor level using authori zation code 1 and account code 1 Entries to the system by others would show the numbers for the authorization codes and account codes they used For example someone authorized at the refrigeration settings level using account code 2 would leave a trail as 3 2 in the Lvl column AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 15 Navigation The cursor Changing numeric values Changing name fields Next we ll take a look at how to navigate around the system from the keypad Press EXIT to r
6. KC 16x Enter the same address set on the switches in the AKC 165 during installation then select Init and press ENTER AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 The AKC 165 subcooling controller is now completely installed and configured Using the AKC 165 Note If you are not familiar with navigation in the Danfoss rack controller whether at the or at your PC consult the last section of this manual Authorization amp Navigation Get your authorization code from the system owner s representative The AKC 165 functions as a node on the I O input output network of a Danfoss supermarket control system You can view information and make settings from a rack controller on the host network or from a PC connected to the system locally or by remote modem communications The screens you will see are the same Evaporators Name Address Current Target SubCool B AA 18 8 F Z20 0 F g Defrost Map This screen contains the name of the circuit its address and the current temperature and target The Defrost Map is not applicable to a subcooling circuit a blank map will appear if the icon is selected while a subcooling circuit is highlighted The expanded status screen For full and detailed information with the subcooling circuit highlighted press ENTER at the controller keypad or click on the highlight with your mouse from a PC You will then see the expanded status screen The fo
7. Refrigeration and Air Conditioning Controls Users manual AKC 165 Subcooling Controller ADAP KOOL REFRIGERATION AND AIR CONDITIONING Table of Contents Introduction Subcooling system layout diagrams Installing an AKC 165 Subcooling Controller Mounting Snaptrack mounting Screw mounting Power supply p 4 Addressing p 4 5 Network connections p 5 Mounting temperature sensors p 5 Sensor connections p 6 Power connection p 6 Installer s final inspection p 6 System hookup diagram p 7 Configuring an AKC 165 pp 8 9 The evaporator configuration screens of the AK2 SC 255 and AKC 55 Using the AKC 165 Subcooling Controller pp 10 14 Evaporator status p 10 Expanded status screen information pp 10 11 Liquid out temperature configuration p 11 Delta T temperature configuration p 11 Settings screen p 12 Service screens p 13 14 Manual operation p 13 Shutdown p 14 Verify sensors p 14 Authorization Navigation and Making Changes pp 15 17 Getting authorized p 15 Navigation and making changes p 16 17 AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 Introduction The AKC 165 is a subcooling controller that controls an AKV electronic expansion valve feeding the evaporator in a plate heat exchanger so as to maintain downstream outlet liquid refrigerant at a tempera ture selected by the user or to maintain a selected temperature drop across the heat exchanger The drawings below show two typical systems a
8. as the type of AKC Danfoss recommends that you select User Def as the Fixture Name and then enter Subcooler as the user defined name These choices will be of value later The other fields and their possible contents are Subcool Target Based On Liq Out Liq Delta Target Use Suction Pressure Yes No Use Discharge Pressure Yes No Control is based on the temperature of the liquid as it leaves the subcooler on its way to the cases Control is based on the actual calculated diference between subcooler inlet and outlet temperature for the system refrigerant being subcooled System Liquid Delta T The temperature or differential target the controller will maintain Superheat will be determined using suction pressure rather than a temperature sensor at the evaporator outlet Superheat will be determined using temperature sensors for both inlet and outlet This answer must always be used with single rack screw compressor systems Always use this setting when subcooling with a second rack Configuration is almost complete Now return to the Main Menu select Communications then I O network then select Rescan network and choose selection to rescan the entire network This will take a few minutes When the rescan is finished return to the Main Menu Next select Configuration Refrigeration Rack Board amp Points Select the rightmost icon at the bottom of the screen Other Controllers then A
9. ch you can use alphabetic characters and certain symbols to create a name or message To see an example of such a field and describe how to change it we will look at the AKC 55 Name field on the AKC 55 Info screen From the Main Menu select AKC 55 Info AKC SS Nene iy 4KC 55 Address 7 0 Software Version 70 703 of I O Boards 7 0 Modem Detected No Clock Operational Yes Config Checksum 0K ROM Checksum 0K Last Database Loaded From AKA 65 File SUBCOOL 254 249 18 12 00 Desc Subcooler Manual screens db When 02 19 02 10 26 AM To enter or change a the name of the unit or any other name From the AKC 55 keypad Move the cursor to the name field and press the key Now the right and left arrow keys move you forward and backward through the 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 From your PC Right click with your mouse on the character space you want to change to enter a new AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 16 Changing list fields name right click in the first character space in the field then type to edit or enter a new name as you want it when the name appears as you want it left click on the field or press the ENTER key to save the new name Return to the Main Menu and select
10. ck preferred or four panhead screws to thto a flat surface The sensor connectors are locked into the correct jacks check the arrows printed on the controller The power connector is locked into the power jack check the arrow printed on the controller The connector for the network cable is locked into the correct jack check the arrow printed on the controller Connection has been made to the I O network by splicing the red and black signal wires and their shield to an I O cable run connected to the AK2 SC 255 or AKC 55 that is host controller for the subcooling function The address is correctly set 01 02 03 etc The rubber cover for the address switch access hole is back in place AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 NETWORK WREHARNI S PN 9 C164 H L 5 a es Co E A L A Via Ea f tS i S4 SYSTEM LIQUID OUTLET l S3 SYSTEM LIQUID INLET Ky a S2 GAS OUT ES tS S1 LIQUID IN p POWER CABLE LA 4 ee S KVQ WIREHARNESS 953 04AKC164 S ct to 24VAC supply A minimum KVQ TO AKV ADDAPTOR _ g AKV 10 95 O2AKV X ae NS S T SS AN SS A
11. d to deliver a set delta T across the subcooler these lines appear in the upper half of the expanded status screen instead of those shown above for obvious reasons System Liquid Delta T 0 0 F System Liquid Target 0 0 F System Liq In System Liq Out and the fields have these meanings System Liquid Delta T System Liquid Target System Lig In System Liq Out o F O F The actual calculated diference between subcooler inlet and outlet temperature for the system refrigerant being subcooled The setpoint desired delta T for the system refrigerant being subcooled The sensed temperature of the refrigerant doing the subcooling as it enters the subcooler The sensed temperature of the refrigerant doing the subcooling as it leaves the subcooler AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 11 AKC 165 Settings From the Status screen selecting the settings icon third from the left at the bottom of the screen will produce the settings screen SubCool B AALl Settings Addr 1 System Liquid Target 20 0 F SH Target fa 88 Only two settings can be made System Liquid Targetand SH Target which are respectively the amount of subcooling and the superheat the controller will seek to maintain Subcooling and superheat for a given heat exchanger are related Basically the greater the superheat the greater the subcooling Since optimum superheat setting for a given subcooling
12. eturn to the Main Menu At the AKC 55 keypad no matter what data you are looking at you can always return to the Main Menu by pressing the MENU key The EXIT key on the other hand takes you back one level From your PC each right click of your mouse in any data free area of the screen takes you back one level sequential right clicks will return you to the Main Menu Notice that one of the selections in the main body of the menu is in reverse video fields on the screen is in reverse instead of the test being dark on a white background it is white on a dark background Press one of the arrow keys and you will see that the reverse video moves from item to item on the menu You are moving the Site Alarm Logger s cursor At your PC move the cursor by clicking on another field To select from any menu or screen 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 screen by screen From the keypad To change a numeric value place the cursor on the value you want to change and simply key in the new value from the keypad When you have entered the correct value press ENTER From your PC Click with your mouse on the field you want to change enter the new numerals from the keyboard then either press ENTER on the keyboard or left click with your mouse to save the change A name field is one in whi
13. ge Pressure Tc Inlet temp Outlet temp Discharge Pressure q Compressors Compressors Subcooler n q m EIN S4 Sys Liquid S1 Liquid Outlet temp Inlet temp l A C ttr gt Suction Pressure 4 gt Suction Pressure To A AKV Valve amp Expansion Valve 8 Q Evaporators Evaporators Single low temp system subcooling with screw compressors Condenser f f A 4 S3 Sys Liquid S2 Gas Discharge Pressure Tc Inlet temp Outlet temp E i Subcool iro ubcooler d an q gt _ S4 Sys Liquid S1 Liquid i Outlet temp inet mp C W Suction Pressure To A AKV Valve QS Expansion Valve 3 Evaporators AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 Installing an AKC 165 Mounting Snaptrack mounting Screw mounting Power supply Addressing an AKC 165 The AKC 165 has connectors for four temperature sensors and a power connector see below Since they are nodes on the I O network AKC 164 s communicate with a host AKC 55 over TP 78K twisted pair shielded cable The controller s name and code number are printed on the label as shown at left below There are two standard mounting techniques for AKC 165 s They may be snaptrack mounted or secured with screws using the mounting holes on the enclosure Both methods are illustrated below The AKC 165 requires 24 Vac 48 VA power from a Danfoss PM 164 120 V line input or PM 164 2 230 V
14. in subcooling control and a field in which an offset for each can be entered if needed In practice sensor readings in this screen are compared with the reading of a precision spot thermometer placed in the sensor location If the variance between the sensed temperatures is significant an appropriate offset can be made to the sensor using this screen AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 14 Authorization amp Navigation Getting authorized If you re going to be making changes you need to enter a valid authorization code at the appropriate level You should receive a code and account number from the system owner Only one authorized user can have access to the system at a time Authorization has a number of levels an authorization code can be for the entire system or for refrigera tion or HVAC alone To enter your authorization code and account code select Authorization from the Main Menu When the authorization screen appears the current level of access probably View Only will be seen to have an asterisk Look at the screen on the next page 0 2 14 15 Authorization View Only l Supervisor 5 HVAC Set 2 Refrig All 6 Complete Syst 3 Refrig Set Alarms 4 HVAC All 8 View Only auth Gi Account Audit Authorization Origin Ly 00013 00013 02 15 02 15 20 Moden 00012 00012 O2 15 02 14 51 Modem 00011 00011 O2 13 02 12 04 Moden 00010 00010 02 12 02 11 23 Moden 00009 00001 O2Z2 11 02
15. line input or other 24 Vac 48 VA Class 2 power supply able to tolerate the ambient conditions Mount the power supply where convenient to the AKC 165 An AKC 165 connected to an AK2 SC 255 or AKCC 55 rack controller must have a unique adddress in the range 01 99 The set of node addresses is shared by all devices on the I O network and no two addresses can be the same On the AKC 165 the address is set by two rotary switches located side by side beneath the waterproof plug shown in the following illustration Each switch has an arrow pointer that also serves as a screwdriver slot Use a small screwdriver to rotate the arrowhead on each switch until the left arrowhead points to the first digit and the right arrowhead to the second digit of the chosen address You must interrupt and restore power ot the AKC 165 before the new address will take effect AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 Network connections for AKC 165 s Where to mount temperature sensors How to mount temperature sensors To connect the AKC 165 to the I O network first splice a 4 pin bus connector cable part number 95 03CC164 to the main I O cable run from the rack controller The cable is two feet long Then plug the connector into the AKC 165 where indicated gy the arrow printed on top which reads From Rack Controller There is no polarity requirement for the A and B leads If this is the last I O node on a main cable run con
16. llowing screen is for subcooling control configured to deliver subcooled liquid at a set temperature Below that discussion is an expanded status screen when control is configured for a set delta T across the subcooler AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 10 Liquid out temperature strategy Delta T strategy SubCool B AAl AKC 165 System Liquid Target 20 0 F System Liq Out Valve 9 Superheat 22 3 SH Target 15 0 F Time Fri SuperHeat Ctrl 18 7 F 14 59 Eeg Status vl 2l Liq in 12 7 F Gas out 35 0 F Ao The fields and their contents are as follows System Liquid Target System Liq Out Valve Superheat SH Target Liq in Gas out The desired liquid temperature setpoint Actual temperature of the liquid leaving the subcooler on its way to the refrigerated fixtures The current valve open percentage of every six second interval In the example the valve is open 55 of the time or 3 3 seconds out of every six second interval The temperature difference across the subcooler for the refrigerant doing the subcooling The desired superheat across the subcooler s evaporator when the AKV electronic expansion valve is open The current temperature at the subcooler evaporator s inlet for the refrigerant doing the subcooling The temperature of the subcooling refrigerant as it leaves the subcooler When subcooling control is configure
17. nect a terminator across network wires A and B VM a7 After connecting to the network it is suggested that you mount the sensors and connect them to the AKC 165 then mount the power supply and connect it Location of the sensors is critical Referring to the appropriate diagram on page 3 mount the four temperature sensors at the plate heat exchanger subcooler as follows S1 Liquid in At the subcooling liquid s inlet S2 Gas out A minimum of 6 inches from the gas outlet S3 System liquid inlet At the subcooled liquid s inlet S4 System liquid outlet At the subcooled liquid s outlet Each sensor is supplied with two straps for fastening For pipe mounted sensors one strap is used for fastening the sensor element and the second is used for cable strain relief Pipe mounted sensors should be positioned at two o clock or ten o clock and musr be insulated The sensor in the following diagram is shown uninsulated for purposes of illustration only AKC 165 Subcooling Controller 03 06 1 084R9896 RS 8B E2 22 Sensor connections Power connection AKC 165 Installer s Final Inspection Connect the four sensors where the labeling on the controller indicates Connect power 24V 48VA where the labeling on the controller indicates When an AKC 165 is completely installed you will see Looking at the controller d 2 3 4 5 6 7 The AKC 165 is securely mounted using its snaptra
18. thout notice provided that alterations to products already on order shall not require material changes in specifications previously agreed upon by Danfoss and the Purchaser 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 Copyright 2001 2006 Danfoss Inc 084R9896 RS 8B E2 22
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