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Model 8680 SureFlow Adaptive Offset Controller Operation

1. EXH CONFIG Separate Additional menu items to program for temperature and pressure control VENT MIN SET 280 CFM 10 air changes per hour TEMP MIN SET 400 CFM Required flow to cool laboratory TEMP LOW 1 2 volts Thermostat switches from VENT MIN SET to TEMP MIN SET TEMP HIGH OFF Reheat only no additional supply flow required SETPOINT 0 001 H O Pressure differential set point Sequence Of Operation Beginning scenario Laboratory is maintaining pressure control 0 001 H O Temperature requirement is satisfied Fume hood sashes are down total hood exhaust is 250 CFM Supply air is 280 CFM maintain ventilation General exhaust 130 CFM calculated from below Fume hood General exhaust Offset Supply air 250 100 280 The fume hood is opened so that the chemists can load experiments into the hood The face velocity 100 ft min is maintained by modulating the fume hood dampers The total fume hood flow is now 1 000 CFM Fume hood General exhaust Offset Supply air 1 000 0 100 900 The supply air volume changes to 900 CFM 1 000 CFM hood exhaust 100 CFM offset The general exhaust is closed since no additional exhaust is needed for temperature or ventilation However the Digital Interface Module indicates the laboratory is now 0 0002 H2O not negative enough The AOC algorithm slowly changes the offset until pressure control is maintained In this case the offset changes to 200 CFM which
2. field calibration or analog output calibration lost Check all data programmed and confirm unit is function correctly Part Two DIAGNOSTICS MENU continued SOFTWARE NAME TEMP INPUT TEMPERATURE INPUT LOW ALM REL HIGH ALM REL RELAY OUTPUT ACCESS CODE END OF MENU ITEM DESCRIPTION The TEMP INPUT item reads the input from the thermostat When this item is entered a voltage will be indicated on the display The exact voltage displayed is relatively unimportant It is more important that the voltage changes indicating the thermostat is working correctly The output range that can be read is 0 10 VDC Zero volts correlates to maximum cooling while 10 volts 5 volts on 0 5 V thermostats correlates to maximum heating The relay menu items are used to change the state of a particular relay contact LOW HIGH When an item is entered the display will indicate either OPEN or CLOSED The A F keys are used to toggle the state of the relay Pressing the A key will OPEN the alarm contact Pressing the W key will CLOSE the alarm contact When the contact is closed the relay is in an alarm condition The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access toa menu If the ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu Factory default for acce
3. 12x14x10 1 680 ft 5 foot fume hood 250 CFM min 1 000 CFM max Flow offset 100 500 CFM Ventilation set point 280 CFM ACPH 10 Temperature set point 400 CFM Pressure differential 0 001 H 0 Value supplied by laboratory designer Room Pressure Control System 1 Model 8680 Adaptive Offset Control System mounted in the laboratory 2 A through the wall pressure sensor mounted between the corridor referenced space and laboratory controlled space 3 Damper or pressure dependent VAV box with actuator assembly mounted in supply air duct s 4 Damper or pressure dependent VAV box with actuator assembly mounted in exhaust air duct 5 Flow station mounted in supply air duct 6 Flow station mounted in general exhaust air duct 7 Flow station mounted in fume hood exhaust duct Temperature Control System 1 Thermostat deadband type mounted in the laboratory 2 Reheat coil mounted in supply air duct s Fume Hood Control System 1 Independent SUREFLOW VAV Face Velocity Control system 36 Part Two Based on the preceding information and knowing duct sizes the following required menu items can be programmed MENU ITEM ITEM VALUE DESCRIPTION HD1 DCT AREA 0 78 f 12 inch round Fume hood duct area EX1 DCT AREA 0 55 Y 10 inch round General exhaust duct area SP1 DCT AREA 1 0 Y 12 x 12 Supply duct area MIN OFFSET 100 CFM Minimum offset MAX OFFSET 500 CFM Maximum offset
4. ACPH TOT EXH FLOW X 60 min hour ROOM VOLUME This is a system information only menu item no programming is possible The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access to a menu Ifthe ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu Technical Section ITEM RANGE DEFAULT bold NONE Read only value NONE NONE Read only value NONE NONE Read only value NONE NONE Read only value NONE NONE Read only value NONE NONE Read only value NONE ON or OFF OFF 25 FLOW CHECK MENU SOFTWARE NAME HD1 FLOW IN FUME HOOD EXHAUST FLOW EX1 FLOW IN GENERAL EXHAUST FLOW SP1 FLOW IN SUPPLY AIR FLOW 26 ITEM DESCRIPTION The HD1 FLOW IN menu item displays the current exhaust flow from a fume hood This item is a diagnostics tool to compare the hood flow reading to a traverse of the duct work If flow reading and traverse match within 10 no change is needed If flow error is greater than 10 adjust the HD1 DCT AREA until error is within 10 When a volt meter is hooked to the flow station output a voltage sho
5. EMERGENCY key puts the controller into emergency mode If the room is under negative room pressure control the emergency mode will maximize the negative pressure Conversely if the room is under positive room pressure control the emergency mode will maximize the positive pressure Pressing the EMERGENCY key will cause the display to flash EMERGENCY the red alarm light to flash on and off and the audible alarm to beep intermittently To return to control mode press the EMERGENCY or RESET key Alarms SUREFLOW has visual red light and audible alarms to inform you of changing conditions The alarm levels set points are determined by administrative personnel Industrial Hygienists or the facilities group depending on the organization The alarms audible and visual will activate whenever the preset alarm level is reached Depending on the SUREFLOW items installed programmed alarms will activate when room pressure is low or inadequate when room pressure is high or too great or when the supply or general exhaust air flow is insufficient When the laboratory is operating safely no alarms will sound Example The low alarm is programmed to activate when the room pressure reaches 0 001 inches H O When the room pressure drops below 0 001 inches H O gets closer to zero the audible and visual alarms activate The alarms turn off when set to unlatched when the unit returns to the safe range which is defined as negative pressure greate
6. MIN OFFSET or greater the MAX OFFSET pressure control will not be maintained The VENT MIN SET item sets the ventilation supply airflow set point This item provides a minimum supply air flow to meet the ventilation requirement by preventing the supply flow from going below the preset minimum flow The controller will not allow the supply air damper to be closed further than the VENT MIN SET set point If room pressure is not maintained at minimum supply flow the general exhaust damper modulates open until pressure set point is reached provided offset is between MIN OFFSET and MAX OFFSET The TEMP MIN SET item sets the temperature supply airflow set point This item provides supply air flow adequate to meet the temperature requirements by preventing the supply flow from going below the preset minimum flow The controller will not allow the supply air damper to be closed further than the TEMP MIN SET set point If room pressure is not maintained at minimum temperature flow the general exhaust damper modulates open until pressure set point is reached provided offset is between MIN OFFSET and MAX OFFSET WIRING This item requires a 0 5 or 0 10 VDC thermostat to be wired to the TEMPERATURE input DIM pins 23 and 24 The thermostat toggles the AOC between VENT MIN SET and TEMP MIN SET Technical Section ITEM RANGE DEFAULT bold 0 to 0 19500 H O or 0 to 0 19500 H O 0 00100 H O Pressure based flow stations 0 283
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8. be observed for system to operate correctly The TSI provided cables are all color coded to ensure proper wiring A wiring diagram is located in Appendix B of this manual Wiring associated with non TSI components should be closely checked for correct installation Confirming physical installation is correct All of the hardware components need to be installed properly Review the installation instructions and verify components are installed properly at the correct location This can be easily confirmed when checking the wiring Verifying individual components Verifying all TSI components are operating correctly requires following a simple procedure The fastest procedure involves first checking the DIM and then confirming all component parts are functioning NOTE These checks require power to the AOC and all components CHECK DIM Press TEST key to verify Digital Interface Module DIM electronics are functioning correctly At the end of the self test the display will show SELF TEST PASSED if DIM electronics are good If unit displays DATA ERROR at the end of the test the electronics may be corrupted Check all software items to determine cause of DATA ERROR If SELF TEST PASSED was displayed proceed to check individual components Enter Diagnostics and Flow Check Menu to check the following Control output supply if controlling supply air Control output exhaust if controlling exhaust air Sensor input if pressure se
9. decreases the supply volume by 100 CFM The additional offset maintains the pressure differential at 0 001 HO set point Fume hood General exhaust Offset Supply air 1 000 0 200 800 Technical Section 37 The hood is shut after the experiments are loaded so the initial conditions prevail Fume hood General exhaust Offset Supply air 250 130 100 280 An oven is turned on and the laboratory is getting warm The thermostat sends the AOC a signal to switch to temperature minimum TEMP MIN SET This increases the supply air to 400 CFM The general exhaust air must also increase damper opens to maintain flow balance Fume hood General exhaust Offset Supply air 250 250 100 400 The control loop continuously keeps the room balance room pressure and temperature control satisfied Checkout The AOC controller should have the individual components checked prior to attempting control of the laboratory The checkout procedure outlined below will confirm all hardware is performing correctly The checkout procedure is not difficult and will catch any hardware problems The steps are as follows Confirm wiring is correct The most common problem with installed hardware equipment is incorrect wiring This problem usually exists on initial installation or when modifications to the system take place The wiring should be very closely checked to verify it exactly matches the wiring diagram Polarity must
10. display saving data gives confirmation data is being saved Part Two AJY Keys The A F keys are used to scroll through the menus menu items and through the range of item values that can be selected Depending on the menu item selected the value may be numerical specific property on off or a bar graph NOTE When programming a menu item continuously pressing the arrow key will scroll through the values faster than if arrow key is pressed and released Keystroke Procedure The keystroke operation is consistent for all menus The sequence of keystrokes is the same regardless of the menu item being changed 1 Press the MENU key to access the main menu 2 Use the A V keys to scroll through the menu choices The blinking cursor needs to be on the first letter of the menu you want to access 3 Press the SELECT key to access chosen menu 4 The menu selected is now displayed on line one and the first menu item is displayed on line 2 Use the A F keys to scroll through the menu items Scroll through the menu items until desired item is displayed NOTE If Enter Code is flashing the access code must be entered before you can enter the menu Access code is found in Appendix C Appendix C may have been removed from the manual for security reasons 5 Press the SELECT key to access chosen item The top line of display shows menu item selected while the second line shows current item value 6 Use the AY keys to chang
11. displayed is relatively unimportant It is more important that the voltage is changing which indicates the flow station is working correctly 0 volts displayed equals zero flow 5 volts displayed equals 2832 ft min x duct area ft pressure based flow station 5 volts displayed equals TOP VELOCITY x duct area ft linear based flow station ITEM RANGE DEFAULT bold NONE Read only value NONE NONE Read only value NONE NONE Read only value NONE Part Two FLOW CHECK MENU continued SOFTWARE ITEM DESCRIPTION NAME ACCESS The ACCESS CODE item selects whether an access code pass code CODE is required to enter the menu The ACCESS CODE item prevents unauthorized access to a menu Ifthe ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu END OF The END OF MENU item informs you that the end of a menu has MENU been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu Technical Section ITEM RANGE DEFAULT bold ON or OFF OFF 27 DIAGNOSTICS MENU SOFTWARE NAME CONTROL SUP SUPPLY AIR CONTROL OUTPUT CONTROL EXH EXHAUST AIR CONTROL OUTPUT SENSOR INPUT PRESSURE SENSOR SIGNAL CHECK SENSOR STAT SENSOR COMMUNICATION 28 ITEM DESCRIPTION The CONTROL SUP item manually changes the control output signal to th
12. gray keys with blue characters are used to program the unit A thorough description of each key is given on the next two pages User Basics 3 User Keys Gray with Black Letters The four keys with black letters provide you information without changing the operation or the function of the unit TEST Key The TEST key initiates an instrument self test Pressing the TEST key activates a scrolling sequence on the display that shows the product model number software version and all set point and alarm values The unit then performs a self test that tests the display indicator lights audible alarm and internal electronics to ensure they are operating properly Ifa problem with the unit exists DATA ERROR will be displayed You should have qualified personal determine the problem with the unit RESET Key The RESET key performs three functions 1 Resets the alarm light alarm contacts and audible alarm when in a latched or non automatic reset mode The DIM must return to the safe or normal range before the RESET key will operate 2 Resets the emergency function after the emergency key has been pressed see EMERGENCY key 3 Clears any displayed error messages MUTE Key The MUTE key temporarily silences the audible alarm The time the alarm is temporarily silenced is programmable by you see MUTE TIMEOUT When the mute period ends the audible alarm turns back on if the alarm condition is still present NOTE You can program the audible ala
13. has a green light and red light to indicate room pressure status The green light is on when the room has proper room pressure The red light comes on when an alarm condition exists Sliding the door panel to the right reveals a digital display and keypad Figure 2 The display shows detailed information about room pressure alarms etc The keypad allows you to test the device put the device into emergency mode and program or change the device parameters SureFiow SureFiow EMER MUTE A d 2 iil 2 iil Figure 2 Digital Interface Module DIM SUREFLOW has two levels of user information l SUREFLOW has a red light and green light to provide continuous information on room pressure status 2 SUREFLOW has a hidden operator panel providing detailed room status information self testing capabilities and access to the software programming functions NOTE The unit provides continuous room pressure status through the red and green light The operator panel is normally closed unless further information on room pressure status is needed or software programming is required 2 Part One Operator Panel The DIM in Figure 3 shows the location of the digital display keypad and lights An explanation of the operator panel follows the figure JISPLA 4 5 lul Figure 3 SUREFLOW Operator Panel Open Green Red light The green light is on when all the conditions for proper room pressure are a
14. menu Ifthe ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu ITEM RANGE DEFAULT bold 0 10 square feet 0 0 9500 square meters The DIM does not compute duct area The area must be first calculated and then entered into the unit 0 NONE PRESSURE or LINEAR PRESSURE 0 5 000 FT MIN 0 25 4 m s 0 ON or OFF OFF Part Two SUPPLY FLOW MENU SOFTWARE NAME SP1 DCT AREA SUPPLY AIR DUCT SIZE SP1 FLO ZERO SUPPLY FLOW STATION ZERO FLO STA TYPE FLOW STATION TYPE TOP VELOCITY MAXIMUM FLOW STATION VELOCITY ACCESS CODE END OF MENU ITEM DESCRIPTION The SP1 DCT AREA item inputs the supply air exhaust duct size The duct size is needed to compute the supply air flow into the laboratory This item requires a flow station to be mounted in each supply duct If the DIM displays English units area must be entered in square feet If metric units are displayed area must be entered in square meters The SP1 FLO ZERO item establishes the flow station zero flow point A zero or no flow point needs to be established in order to obtain a correct flow measurement output see Calibration section All pres
15. operating mode Pressing the key once will exit the normal operating mode and enter the programming mode When the MENU key is first pressed the first two menus are listed When the unit is being programmed the MENU key acts like an escape key When scrolling through the main menu pressing the MENU key will return the unit to standard operating mode When scrolling through the items on a menu pressing the MENU key will return you to the list of menus When changing data in a menu item pressing the MENU key will escape out of the item without saving changes When programming is complete pressing the MENU key will return the unit to normal operating mode SELECT Key The SELECT key has three functions l The SELECT key is used to gain access to specific menus To access a menu scroll through the menus using arrow keys and place the flashing cursor on the desired menu Press the SELECT key to select the menu The first line on the display will now be the selected menu and the second line will show the first menu item The SELECT key is used to gain access to specific menu items To access a menu item scroll through the menu items until item appears Press the SELECT key and the menu item will now appear on the first line of the display and the second line will show the item value Pressing the SELECT key when finished changing an item will save the data and exit back to the menu items An audible tone 3 beeps and visual
16. port If you are unfamiliar with the keystroke procedure please see Programming Software for a detailed explanation This section provides the following information Complete list of menu and all menu items Gives the menu or programming name Defines each menu item s function what it does how it does it etc Gives the range of values that can be programmed Gives default item value how it shipped from factory The menus covered in this section are divided into groups of related items to ease programming As an example all set points are in one menu alarm information in another etc The manual follows the menus as programmed in the controller The menu items are always grouped by menu and then listed in menu item order not alphabetical order Figure 5 shows a chart of all the Model 8680 controller menu items Technical Section 11 SETPOINTS SETPOINT VENT MIN SET TEMP MIN SET UNOCCUPY SET MAX SUP SET MIN EXH SET TEMP LOW TEMP HIGH MIN OFFSET MAX OFFSET ACCESS CODE CONTROL SPEED SENSITIVITY CONTROL SIG KC VALUE TI VALUE KC OFFSET ACCESS CODE INTERFACE NET PROTOCOL NET ADDRESS ACCESS CODE 12 ALARM LOW ALARM HIGH ALARM MIN SUP ALM MIN EXH ALM ALARM RESET AUDIBLE ALM ALARM DELAY ALARM RELAY MUTE TIMEOUT ACCESS CODE SYSTEM FLOW TOT SUP FLOW TOT EXH FLOW OFFSET VALUE SUP SETPOINT EXH SETPOINT ACPH ACCESS CODE HOOD FLOW HD1 DCT AREA HD1 FLO ZERO FLO STA TYPE TOP VE
17. trigger to inform you pressure differential is not being maintained NOTE The pressure differential is a slow secondary control loop The system initially starts with a calculated offset value and then slowly adjusts the offset value to maintain pressure differential Temperature control Temperature control is maintained by the thermostat which directly opens closes the reheat coil when heating is required In addition the supply flow can toggle to temperature minimum if additional flow is required When cooling is required the thermostat toggles the supply air from ventilation minimum to temperature minimum usually a larger supply flow value Once temperature is satisfied the thermostat switches the supply air from temperature to ventilation minimum Technical Section 34 NOTE The greatest flow requirement dominates the supply flow If hood replacement air exceeds the ventilation or temperature flow minimums the replacement air requirement is maintained minimums are ignored In summary understanding the AOC control algorithm is the key to getting the system functioning correctly The AOC control algorithm functions as follows SUPPLY AIR Supply air is at minimum position unless additional replacement air is required fume hood or general exhaust when supply air is at maintained Required Software Programming GENERAL EXHAUST General exhaust is closed or at minimum position except minimum position an
18. 2 ft min 0 14 4 m s x duct area in square feet f square meters m Linear based flow stations 0 to TOP VELOCITY times the duct area in square feet f square meters m 0 Pressure based flow station 0 2832 ft min 0 14 4 m s x duct area in square feet R square meters m Linear based flow stations 0 to TOP VELOCITY times the duct area in square feet f square meters m 0 13 SETPOINTS MENU continued SOFTWARE NAME UNOCCUPY SET UNOCCUPIED SUPPLY FLOW MINIMUM MAX SUP SET MAXIMUM SUPPLY FLOW SET POINT 14 ITEM DESCRIPTION The UNOCCUPY SET item sets a minimum supply flow set point when the laboratory is unoccupied requires fewer air changes per hour When UNOCCUPY SET is active the VENT MIN SET and TEMP MIN SET set points are turned off since only one minimum supply set point can be enabled The controller will not allow the supply air damper to be closed further than the UNOCCUPY SET set point If room pressure is not maintained at minimum supply flow the general exhaust damper modulates open until pressure set point is reached provided required offset is between MIN OFFSET and MAX OFFSET WIRING This item is enabled when the AUX key is pressed or the RS 485 communications sends a command When AUX key is pressed UNOCCUPY SET is enabled and VENT MIN SET and TEMP MIN SET are disabled Pressing the key a second time disables UNOCCUPY SET and enabl
19. C Off 10 000 to 10 000 CFM 15 SETPOINTS MENU continued SOFTWARE ITEM DESCRIPTION ITEM RANGE NAME DEEAULT bold _ MAX The MAX OFFSET item sets the maximum air flow offset between 10 000 to 10 000 OFFSET total exhaust flow fume hood general exhaust other exhaust and CFM total supply flow MAXIMUM 0 FLOW OFFSET ACCESS The ACCESS CODE item selects whether an access code pass code ON or OFF CODE is required to enter the menu The ACCESS CODE item prevents unauthorized access to a menu If the ACCESS CODE is ON a code OFF is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu END OF The END OF MENU item informs you that the end of a menu has MENU been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu 16 Part Two ALARN MENU SOFTWARE NAME LOW ALARM LOW PRESSURE ALARM HIGH ALARM HIGH PRESSURE ALARM MIN SUP ALM MINIMUM SUPPLY FLOW ALARM MIN EXH ALM MINIMUM EXHAUST FLOW ALARM ITEM DESCRIPTION The LOW ALARM item sets the low pressure alarm set point A low alarm condition is defined as when the room pressure falls below or goes in the opposite direction of the LOW ALARM set point The HIGH ALARM item sets the high pressure alarm set point A high alarm condition is defined as when the room pressure rises above the HIGH ALARM set point The M
20. Figure 9 Pressure sensor door slid open Periodically inspect the other system components for proper performance and physical signs of excessive wear 42 Part Two Pressure Sensor Cleaning Accumulations of dust or dirt can be removed with a dry soft bristled brush such as an artist s brush If necessary water alcohol acetone or trichlorethane may be used as a solvent to remove other contaminants Use extreme care when cleaning the velocity sensors The ceramic sensor may break if excessive pressure is applied if sensor is scraped to remove contaminants or if the cleaning apparatus abruptly impacts the sensor WARNING If you are using a liquid to clean the sensor turn off power to the Model 8680 Do not use compressed air to clean the velocity sensors Do not attempt to scrape contaminants from the velocity sensors The velocity sensors are quite durable however scraping may cause mechanical damage and possibly break the sensor Mechanical damage due to scraping voids the pressure sensor warranty Flow Station Inspection Cleaning The flow station can be inspected by removing mounting screws and visually examining probe Pressure based flow stations can be cleaned by blowing compressed air into the low and high pressure taps flow station does not need to be removed from duct Linear flow stations thermal anemometer type can be cleaned with a dry soft bristled brush such as an artist s brush If necessary water alcohol aceto
21. G FINGOW JOVAYSLNI 1V 227008 N d YATIONLNOD MO14 ISAVHX3 TOULNOD S8vSy N 1SNYHXJ YOSNAS YOSNAS N18 NNO LHM NH9 g Y T OL 6 8 9 S PLEODS N d YANYOISNVAL 972008 N d YOSNAS JANSSIJYd Sr UIU ZL INO OVA YZ 1a 029 N H E gvz008 N d NNOO 9 qay YOSNIS vlv00g N d J19Y9 YANYOASNVAL z t o LNO OVA YZ BC LOR N d YIONGSNVYL IYNSSIAd ozvoog N d YSWYOISNVY 1 09 0z1 XIMOd NdN ZZ OZ 61 E Le LL SNId o pe NIXIM NOILYLS MOT4 vivoog N d 21997 Y3WYOISNVYL OZY008 N d YAWYOISNVAL ORATED NCORP s O JAD xL DICA 900 CARDIGAN R SHOREV 64394 30X MAIL L MN 55126 W ED NCORPORA Controller must be wired exactly as wire diagram shows Making modifications to the wiring may severely damage the unit WARNING Actuator IC Damper System with Pneumati iagram D iring W Figure 12 49 Appendix B Appendix C Access Codes There is one access code for all menus Each menu can have the access code ON or OFF IF on the access code must be entered Pressing the key sequence below will allow access to the menu The access code must be entered within 40 seconds and each key must be pressed within 8 seconds Incorrect sequence will not allow access to the menu Key 1 2 Appendix C ACCESS CODE Emergency Mute Mute Menu Aux 51 TSI TSI Incorporated
22. IN SUP ALM item sets the supply flow alarm set point A minimum flow alarm is defined as when the supply duct flow is less than the MIN SUP ALM set point NOTE Supply air duct size SP1 DCT AREA Supply Flow menu must be entered before MIN SUP ALM can be accessed Actual total supply air flow is found in TOT SUP FLOW menu item system flow menu WIRING This item is disabled when the UNOCCUPY SET is enabled AUX key is pressed or the RS 485 communications sends a command The MIN EXH ALM item sets the general exhaust duct s flow alarm set point A minimum flow alarm is defined as when the general exhaust duct flow is less than the MIN EXH ALM set point NOTE General exhaust air duct size EX1 DCT AREA Exhaust Flow menu must be entered before MIN EXH ALM can be accessed Actual total exhaust air flow is found in TOT EXH FLOW menu item system flow menu Technical Section ITEM RANGE DEFAULT bold OFF 0 to 0 18500 H O 0 to 0 18500 H O OFF OFF 0 to 0 19500 H20 0 to 0 19500 H20 OFF OFF pressure based flow stations 0 to 2832 ft min 0 14 4 m times the supply duct area in square feet ft square meters m Linear based flow stations 0 to TOP VELOCITY times the supply duct area in square feet ft square meters m OFF OFF pressure based flow stations 0 to 2832 ft min 0 14 4 m times the exhaust duct area in square feet ft square meters m Linear based flow s
23. LOCITY ACCESS CODE CONFIGURE DISPLAY AVG UNITS ROOM VOLUME EXH CONFIG ACCESS CODE FLOW CHECK HD1 FLOW IN EX1 FLOW IN SP1 FLOW IN ACCESS CODE EXHAUST FLOW EX1 DCT AREA EX1 FLO ZERO FLO STA TYPE TOP VELOCITY ACCESS CODE Figure 5 Menu Items Model 8680 Controller CALIBRATION SENSOR ZERO SENSOR SPAN ELEVATION ACCESS CODE DIAGNOSTICS CONTROL SUP CONTROL EXH SENSOR INPUT SENSOR STAT TEMP INPUT LOW ALM REL HIGH ALM REL ACCESS CODE SUPPLY FLOW SP1 DCT AREA SP1 FLO ZERO FLO STA TYPE TOP VELOCITY ACCESS CODE Part Two SETPOINTS MENU SOFTWARE NAME SETPOINT PRESSURE SET POINT VENT MIN SET VENTILATION MINIMUM SUPPLY FLOW SET POINT TEMP MIN SET TEMPERATURE MINIMUM SUPPLY FLOW SET POINT ITEM DESCRIPTION The SETPOINT item sets the pressure control set point The SUREFLOW controller will maintain this set point negative or positive under normal operating conditions Pressure differential is not maintained by direct pressure control i e modulating dampers in response to pressure changes The pressure signal is an AOC input that is used to calculate the required air flow offset value The calculated offset value changes the supply or exhaust flow volume which changes the pressure differential When the calculated offset value is between the MIN OFFSET and MAX OFFSET room pressure control can be maintained If the offset required to maintain pressure is less than the
24. Model 8680 SUREFLOw Adaptive Offset Controller Operation and Service Manual February 2002 P N 1980286 Rev C TSI TSI Incorporated Model 8680 SUREFLOw Adaptive Offset Controller Operation and Service Manual February 2002 P N 1980286 Rev C U S AND CANADA OTHER COUNTRIES Sales amp Customer Service Sales amp Customer Service 800 777 8356 651 490 2711 001 651 490 2711 651 490 2874 001 651 490 2874 SHIP TO MAIL TO TSI Incorporated TSI Incorporated ATTN Customer Service P O Box 64394 500 Cardigan Road St Paul MN 55164 Shoreview MN 55126 USA USA E MAIL answers tsi com WEB SITE www tsi com Copyright TSI Incorporated February 2002 AlI rights reserved Part number 1980286 Rev C LIMITATION OF WARRANTY AND LIABILITY Seller warrants the goods sold hereunder under normal use and service as described in the operator s manual shall be free from defects in workmanship and material for 24 months or the length of time specified in the operator s manual from the date of shipment to the customer This warranty period is inclusive of any statutory warranty This limited warranty is subject to the following exclusions a Parts repaired or replaced as a result of repair services are warranted to be free from defects in workmanship and material under normal use for 90 days from the date of shipment b Seller does not provide any warranty on finished goods manufactured by oth
25. adjustment The flow stations need a zero point and or a span programmed prior to using them The Digital Interface Module DIM is programmed with a default configuration that can be easily modified to fit your application The Technical section is separated into five parts that cover all aspects of the unit Each section is written as independently as possible to minimize flipping back and forth through the manual for an answer The Software Programming section explains the programming keys on the DIM In addition the programming sequence is described which is the same regardless of the menu item being changed At the end of this section is an example of how to program the DIM The Menu and Menu Item section lists all of the software items available to program and change The items are grouped by menu which means all set points are in one menu alarm items in another etc The menu items and all related information is listed in table format and includes menu item name description of menu item range of programmable values and how the unit shipped from the factory default values The Setup Checkout section explains the AOC controller theory of operation lists the menu items that need to be programmed for the system to operate provides a programming example and provides information to confirm system is operating correctly The Calibration section describes the required technique to compare the pressure sensor reading to a thermal anemome
26. cooling temperature control mode TEMP MIN SET When the thermostat signal drops below the TEMP LOW voltage set point the TEMP MIN SET is the supply air minimum VENT MIN SET is overruled Zero volts equates to maximum cooling WIRING The thermostat is connected to the temp input pins 23 amp 24 DIM The 0 5 or 0 10 VDC thermostat signal is continuously monitored by the AOC The TEMP HIGH determines when the supply air changes from ventilation control mode VENT MIN SET to temperature heating mode TEMP MIN SET When the thermostat signal is greater than the TEMP HIGH voltage set point the TEMP MIN SET is the supply air minimum VENT MIN SET is overruled If TEMP HIGH is programmed to be off the supply air remains in ventilation mode when heating is required 5 0 5 VDC or 10 volts equates to maximum heating WIRING The thermostat is connected to the temp input pins 23 amp 24 DIM The 0 5 or 0 10 VDC thermostat signal is continuously monitored by the AOC The MIN OFFSET item sets the minimum air flow offset between total exhaust flow fume hood general exhaust other exhaust and total supply flow Technical Section ITEM RANGE DEFAULT bold Pressure based flow stations 0 2832 ft min 0 14 4 m s x duct area in square feet f square meters m Linear based flow stations 0 to TOP VELOCITY times the duct area in square feet f square meters m 0 Off 0 10 VDC Off Off 0 10 VD
27. cts the display s averaging period The display averaging period is the length of time the room pressure has been averaged before being displayed The DISPLAY AVG item value may be set between 0 75 and 40 seconds The higher the averaging value the more stable the display The UNITS item selects the unit of measure that the DIM displays all values except calibration span These units display for all menu items set points alarms flows etc The ROOM VOLUME item is used to input the volume of the laboratory The laboratory volume is needed to calculate ACPH air changes per hour If the DIM displays English units area must be entered in cubic feet If metric units are displayed area must be entered in cubic meters The EXH CONFIG menu item determines the exhaust configuration If the general exhaust duct is separate from the total exhaust select SEPARATE left side of Figure 6 If the general exhaust duct is part of the total exhaust select COMBINED right side of Figure 6 The correct configuration is required for the control algorithm to function correctly AIRFLOW AIRFLOW N R FUME HOOD FLOW GENERAL EXHAUST N STATION FOW 4 PLACES GENERAL EXHAUS GENERAL EXHAUST Figure 6 Exhaust Configuration The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access to a menu Ifthe ACCESS CODE is ON a code is required before
28. d pressure control cannot be FUME HOOD EXHAUST OFFSET Programmed by user User Independent control loop by fume hood controller maintains face velocity programs Hood exhaust flow is minimum and monitored by AOC The maximum AOC does not control the offset fume hood The following menu items must be programmed for the AOC to function See Menu and menu items section for information in individual menu items SUPPLY FLOW MENU SP1 DCT AREA SP1 FLO ZERO FLO STA TYPE TOP VELOCITY EXHAUST FLOW MENU EX1 DCT AREA EX1 FLO ZERO FLO STA TYPE TOP VELOCITY HOOD FLOW SETPOINT MENU MENU HD1 DCT AREA MIN OFFSET HD1 FLO ZERO MAX OFFSET FLO STA TYPE EXH CONFIG TOP VELOCITY NOTE If temperature or pressure control is being maintained by the AOC the following menu items must also be programmed Temperature The temperature cooling and heating values VENT MIN SET TEMP MIN SET TEMP LOW TEMP HIGH Pressure The pressure differential value SETPOINT There are additional programmable software menu items to tailor the controller to your specific application or increase flexibility These menu items are not required to be programmed for the AOC to operate Technical Section 35 Programming Example The laboratory shown is Figure 7 is being initially setup The required HVAC information is below the figure Si sa AQOON N Figure 7 Laboratory Setup Example Laboratory design Laboratory size
29. dequate This light indicates the laboratory is operating safely If any of the room pressure conditions cannot be satisfied the green light turns off and the red alarm light turns on Operator Panel A cover hides the operator panel Sliding the door panel to the right exposes the operator panel Figure 2 Digital Display The alphanumeric digital display is a two line display that indicates actual room pressure positive or negative alarm status menu options and error messages In normal operation green light is on the display indicates information about room pressure If an alarm condition occurs the display will change from STANDARD STANDARD NORMAL to read ALARM will state type of alarm low pressure high pressure flow When programming the unit the display will change and now show menus menu items and current value of the item depending on the specific programming function being performed NOTE The AOC system will control room pressure without a pressure sensor installed However verification that room pressure is being maintained is not possible The display will not indicate room pressure or room pressure status when no pressure sensor is installed The alarms can be programmed to indicate when low supply or exhaust flow is present Keypad The keypad has six keys The gray keys with black letters are user information keys In normal operation these keys are active Additionally the red emergency key is active The
30. e item value 7 Save the new value by pressing the SELECT key pressing the MENU key will exit out of menu function without saving data 8 Press the MENU key to exit current menu and return to main menu 9 Press the MENU key again to return to normal instrument operation If more than one item is to be changed skip steps 8 and 9 until all changes are complete If more items in the same menu are to be changed scroll to them after saving the data step 7 If other menus need to be accessed press the MENU key once to access list of menus The instrument is now at step 2 of the keystroke sequence Programming Example The following example demonstrates the keystroke sequence explained above In this example the high alarm set point will be changed from 0 002 inches H O to 0 003 inches H O Unit is in normal operation scrolling room pressure flows etc Pressure is PRESSURE shown in this case 00100 H2O Technical Section 9 10 Press the MENU key to gain access to the menus The first 2 menu choices are displayed Press the W key once Blinking cursor should be on A of Alarm Press the SELECT key to access the ALARM menu NOTE Blinking cursor must be on A in Alarm Line 1 shows menu selected Line 2 shows first menu item Press the W key once HIGH ALARM will be shown on display Menu selected Item name Press the SELECT key to access the high alarm set point The item name HIGH ALARM will now be displayed
31. e supply air actuator damper or motor speed drive When this item is entered a number between 0 and 255 will be shown on the display indicating the control output value Pressing the A V keys change the count on the display Pressing the A key increases the displayed value while pressing the A W key decreases the displayed value The supply air damper or VAV box should change modulate as the number changes Depending on the actuator s jumper position 0 or 255 is full open on damper Conversely 255 or 0 will be full closed A count of 150 should position the damper approximately 1 2 open On units controlling variable frequency drives fan speed should increase or decrease as numbers change WARNING The CONTROL SUP function overrides the AOC control signal Adequate room pressure will NOT be maintained while in this item The CONTROL EXH item manually changes the control output signal to the exhaust air actuator damper or motor speed drive When this item is entered a number between 0 and 255 will be shown on the display indicating the control output value Pressing the A W keys changes the count on the display Pressing the A key increases the displayed value while pressing the W key decreases the displayed value The exhaust air damper or VAV box should change modulate as the number changes Depending on the actuator s jumper location 0 or 255 is full open on damper Conversely 255 or 0 will be full closed A count of 150 should positio
32. ems with the pressure control loop can be established confirm problem is not with primary flow control loop When this item is entered a value for Kc is indicated on the display Decreasing Ke will slow the pressure control loop down while increasing Kc will increase the pressure control loop speed The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access toa menu Ifthe ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu ITEM RANGE DEFAULT bold Kc 0 1000 The range of values is very large Poor control will occur if values are more than twice or less than 1 2 the default value Ke 200 ON or OFF OFF Part Two SYSTEM FLOW MENU SOFTWARE NAME TOT SUP FLOW TOTAL SUPPLY AIR FLOW TOT EXH FLOW TOTAL EXHAUST AIR FLOW OFFSET VALUE ACTUAL OFFSET VALUE SUP SETPOINT SUPPLY FLOW SET POINT CALCULATED EXH SETPOINT GENERAL EXHAUST FLOW SET POINT CALCULATED ACPH CALCULATED AIR CHANGES PER HOUR ACCESS CODE END OF MENU ITEM DESCRIPTION The TOT SUP FLOW menu item displays the current total measured supply f
33. enu item in diagnostics menu A voltage between 0 and 10 volts DC will be displayed It is not important what the exact voltage is to pass this test Tape over the pressure sensor slide pressure sensor door open and voltage should read approximately 5 volts zero pressure Remove tape and blow on sensor Displayed value should change If voltage changes the sensor is functioning correctly If voltage doesn t change proceed to CHECK Sensor status CHECK Sensor status Enter SENSOR STAT menu item in diagnostics menu If NORMAL is displayed the unit passes test If an error message is displayed go to diagnostics menu section of the manual SENSOR STAT menu item for explanation of error message CHECK Thermostat input Enter TEMP INPUT menu item in diagnostics menu A voltage between 0 and 10 volts DC will be displayed The exact voltage displayed is not important as long as the voltage changes when thermostat changes Zero volts equals maximum cooling while 10 volts 5 volts if 0 5 VDC thermostat equals maximum heating CHECK Flow station The Flow Check menu lists all the flow stations that can be installed Check each flow station menu item that has a flow station attached Enter FLOW IN menu item and the actual flow will be displayed If the flow is correct no changes need to be made If flow is incorrect adjust the corresponding DCT AREA until actual flow matches flow station reading If unit passed all checks the mechan
34. ers or on any fuses batteries or other consumable materials Only the original manufacturer s warranty applies c Unless specifically authorized in a separate writing by Seller Seller makes no warranty with respect to and shall have no liability in connection with goods which are incorporated into other products or equipment or which are modified by any person other than Seller The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein NO OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY IS MADE TO THE EXTENT PERMITTED BY LAW THE EXCLUSIVE REMEDY OF THE USER OR BUYER AND THE LIMIT OF SELLER S LIABILITY FOR ANY AND ALL LOSSES INJURIES OR DAMAGES CONCERNING THE GOODS INCLUDING CLAIMS BASED ON CONTRACT NEGLIGENCE TORT STRICT LIABILITY OR OTHERWISE SHALL BE THE RETURN OF GOODS TO SELLER AND THE REFUND OF THE PURCHASE PRICE OR AT THE OPTION OF SELLER THE REPAIR OR REPLACEMENT OF THE GOODS IN NO EVENT SHALL SELLER BE LIABLE FOR ANY SPECIAL CONSEQUENTIAL OR INCIDENTAL DAMAGES SELLER SHALL NOT BE RESPONSIBLE FOR INSTALLATION DISMANTLING OR REINSTALLATION COSTS OR CHARGES No Action regardless of form may be brought against Seller more than 12 months after a cause of action has accrued The goods returned under warranty to Seller s factory shall be at Buyer s risk of loss and will be returned if at all at Seller s risk of loss Buyer and all users are dee
35. es VENT MIN SET and TEMP MIN SET The MAX SUP SET item sets the maximum supply air flow into the laboratory The controller will not allow the supply air damper to open further than the MAX SUP SET flow set point NOTE The laboratory may not hold pressure set point when supply air is limited ITEM RANGE DEFAULT bold Pressure based flow stations 0 2832 ft min 0 14 4 m s x duct area in square feet f square meters m Linear based flow stations 0 to TOP VELOCITY times the duct area in square feet f square meters m 0 Pressure based flow stations 0 2832 ft min 0 14 4 m s x duct area in square feet f square meters m Linear based flow stations 0 to TOP VELOCITY times the duct area in square feet f square meters m 0 Part Two SETPOINTS MENU continued SOFTWARE NAME MIN EXH SET MINIMUM EXHAUST FLOW SET POINT TEMP LOW TEMPERATURE COOLING TEMP HIGH TEMPERATURE HEATING MIN OFFSET MINIMUM FLOW OFFSET ITEM DESCRIPTION The MIN EXH SET item sets the minimum general exhaust air flow out of the laboratory The controller will not allow the general exhaust air damper to close further than the MIN EXH SET flow set point NOTE This item requires a TSI compatible flow station and control damper to be mounted in the general exhaust duct The TEMP LOW item determines when the supply air changes from ventilation control mode VENT MIN SET to
36. essure direction Adjusting span cannot cross zero pressure Example If unit displays 0 0001 and actual pressure is 0 0001 do not make any adjustments Manually change the air balance close or open dampers or open door slightly to get both unit and actual pressure to read in same direction both read positive or negative This problem can only occur at very low pressures so slightly changing the balance should eliminate the problem Perform a smoke test to determine pressure direction Select SENSOR SPAN item Position thermal air velocity meter in door opening to obtain velocity reading Press A V keys until pressure direction and sensor span match thermal air velocity meter and smoke test Press SELECT key to save sensor span Exit menu calibration is complete Flow station pressure transducer zero NOTE Not required for linear flow stations with 0 5 VDC output Pressure based flow station Disconnect tubing between pressure transducer and flow station Enter menu item that corresponds to flow station Hood flow Exhaust Flow or Supply flow Select HD1 FLO ZERO to take a fume hood flow station zero or Select EX1 FLO ZERO to take a general exhaust flow station zero or Select SP1 FLO ZERO to take a supply flow station zero Press SELECT key Flow zero procedure which takes 10 seconds is automatic Press SELECT key to save data Connect tubing between pressure transducer and flow station Technical Section 41 Linea
37. f constraints built into the software that prevent users from programming conflicting alarm information These are as follows 1 The AOC does not allow the pressure alarms to be programmed within 20 ft min 0 00028 H20 at 0 001 H20 of the control set point Example The control SETPOINT is set at 0 001 H O The LOW ALARM set point cannot be set higher than 0 00072 H20 Conversely the HIGH ALARM set point cannot be set lower than 0 00128 H30 The minimum flow alarms MIN SUP ALM MIN EXH ALM must be programmed to be at least 50 CFM less than the minimum flow set point The pressure alarms LOW ALARM HIGH ALARM can be programmed for positive or negative pressure However both the low and high alarm must be set either positive or negative The AOC does not allow one positive alarm and one negative alarm Alarms do not terminate until the pressure or flow slightly exceeds alarm set point The ALARM RESET item selects how the alarms will terminate when controller returns to the safe range The pressure and flow alarms all terminate the same they are either latched or unlatched If unlatched is selected the alarms automatically turn off when the value slightly exceeds set point If latched is selected the alarms will not terminate until the controller returns to set point and the RESET key is pressed There is a programmable ALARM DELAY that determines how long to delay before activating the alarms This delay effects all pre
38. her scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu ITEM RANGE DEFAULT bold MODBUS CIMETRICS MODBUS 1 247 1 ON or OFF OFF Part Two HOOD FLOW MENU SOFTWARE NAME HD1 DCT AREA FUME HOOD EXHAUST DUCT SIZE HD1 FLO ZERO FUME HOOD FLOW STATION ZERO FLO STA TYPE FLOW STATION TYPE TOP VELOCITY MAXIMUM FLOW STATION VELOCITY ACCESS CODE END OF MENU ITEM DESCRIPTION The HD1 DCT AREA item inputs the fume hood exhaust duct size The duct size is needed to compute the flow out of the fume hood This item requires a flow station to be mounted in each fume hood exhaust duct If the DIM displays English units area must be entered in square feet If metric units are displayed area must be entered in square meters The HD1 FLO ZERO item establishes the flow station zero flow point A zero or no flow point needs to be established in order to obtain a correct flow measurement output see Calibration section All pressure based flow stations need to have an HD1 FLO ZERO established on initial set up Linear flow stations with a 1 5 VDC output also need to have an HD1 FLO ZERO established Linear flow stations with a 0 5 VDC output do not need a HD1 FLO ZERO The FLO STA TYPE item is used to select the flow station input signal PRESSURE is selected when TSI flow stations with pressure transducers are installed LINEAR is selected when a l
39. ical components are physically working Technical Section 39 Calibration The calibration section explains how to calibrate and set the elevation for the AOC pressure sensor and how to zero a flow station NOTE The pressure sensor is factory calibrated and normally does not need to be adjusted However inaccurate readings may be detected if pressure sensor is not installed correctly or problems with the sensor exists Before calibrating check that the sensor is installed correctly usually only a problem on initial set up In addition go into DIAGNOSTICS menu SENSOR STAT item If NORMAL is displayed calibration can be adjusted If an error code is displayed eliminate error code and then verify pressure sensor needs adjustment Adjusting the SUREFLOW pressure sensor calibration may be required to eliminate errors due to convection currents HVAC configuration or equipment used to make the measurement TSI recommends always taking the comparison measurement in the exact same location i e under the door middle of door edge of door etc A thermal air velocity meter is needed to make the comparison measurement Normally the velocity is checked at the crack under the doorway or the door is opened 1 to allow alignment of the air velocity probe making the measurement If the crack under the door is not large enough use the 1 open door technique All pressure transducer based flow stations and 1 5 VDC linear flow stations must be ze
40. ides safety by controlling airborne contaminants that can adversely affect workers in the laboratory people in the laboratory vicinity and experiments For example laboratories with fume hoods have negative room pressure air flowing into the room to minimize exposure to people outside the laboratory The fume hood is the first level of containment and the laboratory space is the second level of containment Room pressure or pressure differential is created when one space hallway is at a different pressure than an adjoining space laboratory The Adaptive Offset Controller AOC creates a pressure differential by modulating supply air into and exhaust air out of the laboratory hallway space is a constant volume system The theory is that if more air is exhausted out than is supplied the laboratory will be negative compared to the hallway A set offset may not maintain an adequate pressure differential under all conditions The AOC compensates for the unknown pressure differential by mounting a pressure differential sensor between the hallway and laboratory that confirms correct pressure differential is being maintained If pressure is not being maintained the AOC modulates the supply or exhaust air until pressure is maintained Se 7 ax wes a s k ROOM ROOM Negative Positive Figure 1 Room Pressure Negative room pressure is present when air flows from a hallway into the laboratory If air flows from the laboratory into the hallway the
41. inear output flow station is installed 0 5 VDC Typically a thermal anemometer based flow station The TOP VELOCITY item is used to input the maximum velocity of a linear flow station output A TOP VELOCITY must be input for the linear flow station to operate NOTE This item is disabled if a pressure based flow station is installed The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access toa menu Ifthe ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu Technical Section ITEM RANGE DEFAULT bold 0 10 square feet 0 0 9500 square meters The DIM does not compute duct area The area must be first calculated and then entered into the unit 0 NONE PRESSURE or LINEAR PRESSURE 0 5 000 FT MIN 0 25 4 m s 0 ON or OFF OFF 31 EXHAUST FLOW MENU SOFTWARE NAME EX1 DCT AREA GENERAL EXHAUST DUCT SIZE EX1 FLO ZERO EXHAUST FLOW STATION ZERO FLO STA TYPE FLOW STATION TYPE TOP VELOCITY MAXIMUM FLOW STATION VELOCITY ACCESS CODE END OF MENU 32 ITEM DESCRIPTION The EX1 DCT AREA item inputs
42. low into the laboratory This is a system information only menu item no programming is possible The TOT EXH FLOW menu item displays the current total measured exhaust flow out of the laboratory This item calculates total exhaust by summing EX1 FLOW IN and HD1 FLOW IN This is a system information only menu item no programming is possible The OFFSET VALUE menu item displays the actual flow offset being used to control the laboratory The OFFSET VALUE is calculated by the AOC control algorithm which uses the MIN OFFSET MAX OFFSET and SETPOINT items to calculate required offset This is a system information only menu item no programming is possible The SUP SETPOINT menu item displays the supply flow set point which is calculated by the AOC control algorithm The calculated SUP SETPOINT is a diagnostic item used to compare the actual TOT SUP FLOW to the calculated flow they should match within 10 This is a system information only menu item no programming is possible The EXH SETPOINT menu item displays the general exhaust flow set point which is calculated by the AOC control algorithm The calculated EXH SETPOINT is a diagnostic item used to compare the actual TOT EXH FLOW to the calculated flow they should match within 10 This is a system information only menu item no programming is possible The ACPH Air Changes Per Hour menu item displays the current laboratory air changes ACPH is calculated by the following formula
43. med to have accepted this LIMITATION OF WARRANTY AND LIABILITY which contains the complete and exclusive limited warranty of Seller This LIMITATION OF WARRANTY AND LIABILITY may not be amended modified or its terms waived except by writing signed by an Officer of Seller SERVICE POLICY Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers our service policy is designed to give prompt attention to any problems If any malfunction is discovered please contact your nearest sales office or representative or call TSI s Customer Service department at 800 777 8356 CONTENTS HOWTO USE THIS MAN UA U css zva cossa zy s a aag aR aea aaa Eaa aap rar ada aia SRV ll PART ONE HH THT 1 WSer Basics fen E E E E AE 1 Thenstrment o aranna A E a 1 Operator Panelis sipna r e a aa E reola a 3 Alam Sea E E reper ire pre terror 5 Before Calling E aTa EA OAA 6 PARI TWO EEE T T TTT ETT 7 Technical Section siare niaior eet iae 7 Software Programming sse eee eee eee eee eee eee 7 Menu and Menu ems eee eee 11 Calibration uinean nie ed Leavis eee 40 Maintenance and Repair Parta sese 42 PAPPENDIX Acc E E hak sda xtca Stneed ee hehe A teh ecsoltaeetereeneavese 45 Specifications a aaa aa aae a aa aaa 45 APPENDIX B rrecn E E E NTE AEE 47 Wiring Information oeann aa eiea aa EA 47 APPENDIX C aS a a a RSS a ranae tints OR ESTONET e oda 51 Le e eea TTT 51 How to Use This Manual The SUREFLOw Operation a
44. n the damper approximately 1 2 open On units controlling variable frequency drives fan speed should increase or decrease as numbers change WARNING The CONTROL EXH function overrides the AOC control signal Adequate room pressure will NOT be maintained while in this item The SENSOR INPUT item verifies that the DIM is receiving a signal from the pressure sensor When this item is entered a voltage will be indicated on the display The exact voltage displayed is relatively unimportant It is more important that the voltage is changing which indicates the sensor is working correctly 0 volts represents a negative pressure of 0 2 inches H O 5 volts represents 0 pressure 10 volts represents a positive pressure of 0 2 inches H30 The SENSOR STAT item verifies that the RS 485 communications between the pressure sensor and DIM is working correctly Pressure sensor error messages do not display on DIM except when SENSOR STAT item is selected This item displays NORMAL if communications are established correctly If problems exist one of four error messages will display COMM ERROR DIM cannot communicate with sensor Check all wiring and pressure sensor address Address must be 1 SENS ERROR Problem with sensor bridge Physical damage to pressure sensor or sensor circuitry Unit is not field repairable Send to TSI for repair CAL ERROR Calibration data lost Sensor must be returned to TSI to be calibrated DATA ERROR Problem with EEPROM
45. nd Service Manual is divided into two parts Part one describes how the SUREFLOW unit functions and how to interface with the device This section should be read by users facilities staff and anyone who requires a basic understanding of how the SUREFLOW operates Part two describes the technical aspects of the product which includes operation calibration configuration and maintenance Part two should be read by personnel programming or maintaining the unit TSI recommends thoroughly reading this manual before changing any software items NOTE This operation and service manual assumes proper SUREFLOW installation Refer to the Installation Instructions to determine if the SUREFLOw has been properly installed iii PART ONE User Basics Part one provides a brief but thorough overview of the SUREFLOW product by maximizing information with minimal reading These few pages explain the purpose The Instrument and the operation Useful User Information Digital Interface Module Alarms of the unit Technical product information is available in Part Two of the manual The manual focuses on laboratory spaces however the information is accurate for any room pressure application The Instrument The SUREFLOW Adaptive Offset Controller AOC maintains laboratory pressure and air balance The AOC measures and controls all air flow into and out of the laboratory and measures the pressure differential Proper laboratory pressure differential prov
46. ne or trichlorethane may be used as a solvent to remove other contaminants Replacement Parts All components of the room pressure controller are field replaceable Contact TSI HVAC Control Products at 800 777 8356 U S and Canada or 001 651 490 2711 other countries or your nearest TSI Manufacturer s Representative for replacement part pricing and delivery 800227 Digital Interface Module Adaptive ea be a E 800248 Sensor Cable 800414 Transformer Cable Technical Section 43 Appendix A Specifications Dim and AOC Module Display RAN GC s sei sees Reset eee hoes eee 0 20000 to 0 20000 inches H O Resolution vicccciina canteen anes 5 of reading Display Update sss 0 5 sec Inputs Outputs See Wiring Information Appendix B for type SWIN I ogee sees owed E ER TR code ER AK Outputs Alarm Contacts Analog Input RS 485 Operating Temperature Input Power Dim RE ON nenadni ieia e n Dim Weight E E E E S Pressure Sensor Temperature Compensation Range Power Dissipation sss Dimensions DXH ee Wight eetere ann e wa nhdato kates Damper Actuator Types of Actuators Input Power Control Signal Input Time for 90 Rotation Appendix A SPST N O Switch Closing switch initiates condition SPST N O Max current 5A max voltage 150 VDC 250 VAC Maximum switch load 10 mA 5 VDC Contacts close in alarm condition 0 5 or 0 10 VDC depending on input type Yes 32 to 120 F 24 VAC 5 wa
47. nsor is installed Sensor status if pressure sensor installed Temperature input General exhaust flow station Supply flow station Fume hood flow station 38 Part Two The menu items are explained in detail in the Menu and Menu Items section of the manual so their function is not reviewed here If the AOC system passes each of the checks the mechanical piece parts are all functioning correctly CHECK Control output supply Enter CONTROL SUP menu item in diagnostics menu A number between 0 and 255 will be displayed Press the A V keys until either 0 or 255 shows on the display Note the position of the supply air control damper If display reads 0 press the A key until 255 is shown on display If display read 255 press W key until 0 is shown on display Note the position of the supply air damper The damper should have rotated either 45 or 90 degrees depending on actuator installed CHECK Control output exhaust Enter CONTROL EXH menu item in diagnostics menu A number between 0 and 255 will be displayed Press the A W keys until either 0 or 255 shows on the display Note the position of the general exhaust control damper If display reads 0 press the A key until 255 is shown on display If display read 255 press Y key until 0 is shown on display Note the position of the general exhaust damper The damper should have rotated either 45 or 90 degrees depending on actuator installed CHECK Sensor input Enter SENSOR INPUT m
48. nts The pressure value needs to be corrected due to changes in air density at different elevations The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access toa menu Ifthe ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu Technical Section ITEM RANGE DEFAULT bold NONE Unit is factory calibrated No initial adjustment should be necessary NONE Unit is factory calibrated No initial adjustment should be necessary 0 10 000 feet above sea level 0 ON or OFF ON 21 CONTROL MENU SOFTWARE NAME SPEED SENSITIVITY CONTROL SIG CONTROL SIGNAL 22 ITEM DESCRIPTION The SPEED item is used to select the control output speed supply and general exhaust When this item is selected a bar graph is shown on the display There are 10 bars each one representing 10 of speed Starting from the right side sign 10 bars displayed indicates maximum speed This is the fastest the controller will operate 1 bar is the slowest the controller will operate The more bars displayed the faster the control output The SENSITIVITY item is used
49. on line 1 and the item s current value will be displayed on line 2 Item Name Current Value Press the Y key to change the high alarm set point to 0 003 inches H O Press the SELECT key to save the new negative high alarm set point Three short beeps will sound indicating that the data is being saved Immediately after the data is saved the SUREFLOW will return to the menu level displaying the menu title on the top line of the display and the menu item on the bottom line goes to step 4 SETPOINTS SELECT LOW ALARM HIGH ALARM SELECT HIGH ALARM 00200 H20 HIGH ALARM 00300 H20 SELECT HIGH ALARM Saving Data ALARM HIGH ALARM gt gt gt C C C gt gt gt J J D WARNING Ifthe MENU key was pressed instead of the SELECT key the new data would not have been saved and the SUREFLOW would have escaped back to the menu level shown in step 3 Part Two Press the MENU key once to return to the menu level ALARM CONFIGURE Press the MENU key a second time to return to the normal operating level Unit is now back in normal operation PRESSURE 00100 H20 0 Menu and Menu Items The SUREFLOwW is a very versatile device which can be configured to meet your specific application This section describes all of the menu items available to program and change Changing any item is accomplished by using the keypad or if communications are installed through the RS 485 Communications
50. planation contact your local TSI representative or TSI TSI is committed to providing high quality products backed by outstanding service Please have the following information available prior to contacting your authorized TSI Manufacturer s Representative or TSI Model number of unit 8680 Software revision level Facility where unit is installed First two items that scroll when TEST key is pressed Due to the different SUREFLOW models available the above information is needed to accurately answer your questions For the name of your local TSI representative or to talk to TSI service personnel please call TSI at U S AND CANADA OTHER COUNTRIES Sales amp Customer Service Sales amp Customer Service 800 777 8356 651 490 2711 001 651 490 2711 651 490 2874 001 651 490 2874 SHIP TO MAIL TO TSI Incorporated TSI Incorporated ATTN Customer Service P O Box 64394 500 Cardigan Road St Paul MN 55164 Shoreview MN 55126 USA USA E MAIL answers tsi com WEB SITE www tsi com 6 Part One PART TWO Technical Section The AOC is ready to use after being properly installed Please note that the AOC is part of the DIM module and is not a separate component Where AOC is written the overall control sequence is being discussed when DIM is written the manual is referring to programming the unit or viewing what is on the display The pressure sensor is factory calibrated prior to shipping and should not need
51. r flow station 1 5 VDC output Remove flow station from duct or cutoff flow in duct Flow station must have no flow going past the sensor Enter menu item that corresponds to flow station location Hood flow Exhaust Flow or Supply flow Select HD1 FLO ZERO to take a fume hood flow station zero or Select EX1 FLO ZERO to take a general exhaust flow station zero or Select SP1 FLO ZERO to take a supply flow station zero Press SELECT key Flow zero procedure which takes 10 seconds is automatic Press SELECT key to save data Install flow station back in duct Maintenance and Repair Parts The Model 8680 SUREFLOW Room Pressure Controller requires minimal maintenance Periodic inspection of system components as well as an occasional pressure sensor cleaning are all that are needed to insure that the Model 8680 is operating properly System Component Inspection It is recommended that the pressure sensor be periodically inspected for accumulation of contaminants The frequency of these inspections is dependent upon the quality of the air being drawn across the sensor Quite simply if the air is dirty the sensors will require more frequent inspection and cleaning Visually inspect the pressure sensor by sliding open the sensor housing door Figure 9 The air flow orifice should be free of obstructions The small ceramic coated sensors protruding from the orifice wall should be white and free of accumulated debris g p lil
52. r than 0 001 inches H20 Visual Alarm Operation The red light on the front of the unit indicates an alarm condition The red light is on for all alarm conditions low alarms high alarms and emergency The light is on continuously in a low or high alarm condition and flashes in an emergency condition Audible Alarm Operation EMERGENCY key When the EMERGENCY key is pressed the audible alarm beeps intermittently until the EMERGENCY or RESET key is pressed terminating the emergency alarm The emergency alarm cannot be silenced by pressing the MUTE key Audible Alarms All Except Emergency The audible alarm is continuously on in all low and high alarm conditions The audible alarm can be temporarily silenced by pressing the MUTE key The alarm will be silent for a period of time see MUTE TIMEOUT to program time period When the time out period ends the audible alarm turns back on if the alarm condition is still present You can program the audible alarm to be permanently turned off see AUDIBLE ALM The red alarm light will still turn on in alarm conditions when audible alarm is turned off The audible and visual alarms can be programmed to either automatically turn off when the unit returns to the safe range or to stay in alarm until the RESET key is pressed See ALARM RESET User Basics 5 Before Calling TSI This manual should answer most questions and resolve most problems you may encounter If you need assistance or further ex
53. rm to be permanently turned off see AUDIBLE ALM AUX Key The AUX key is active only in specialty applications and is not used on the standard SUREFLOW If the AUX key is used a separate manual supplement will explain the AUX key function Programming Keys Gray with Blue Characters The four keys with blue print are used to program or configure the unit to fit a particular application WARNING Pressing these keys will change how the unit functions so please thoroughly review the manual before changing menu items MENU Key The MENU key performs three functions 1 Provides access to the menus when in the normal operating mode 2 When the unit is being programmed the MENU key acts as an escape key to remove you from an item or menu without saving data 3 Returns the unit to the normal operating mode The MENU key is further described in the Software Programming section of this manual SELECT Key The SELECT key performs three functions 1 Provides access to specific menus 2 Provides access to menu items 3 Saves data Pressing the key when finished with a menu item will save the data and exit you out of the menu item A V Keys The A F keys are used to scroll through the menus menu items and through the range of item values that can be selected Depending on the item type the values may be numerical specific properties on off or a bar graph 4 Part One Emergency Key Red with Black Letters EMERGENCY Key The red
54. roed upon initial system set up Linear 0 5 VDC flow stations do not require a zero flow to be established Calibrating Pressure Sensor Enter calibration menu see Software Programming if not familiar with key stroke procedure Access code is turned on so enter access code All menu items described below are found in CALIBRATION menu Elevation The ELEVATION item eliminates pressure sensor error due to elevation of building See ELEVATION item in Menu and Menu items section for further information Enter the ELEVATION menu item Scroll through the elevation list and select the one closest to the building s elevation Press the SELECT key to save the data and exit back to the calibration menu Sensor zero Slide open pressure sensor door and tape over 1 2 inch diameter sensor orifice see Figure 8 Select SENSOR ZERO item Press SELECT key Sensor zero procedure which takes 120 seconds is automatic Press SELECT key to save the data Remove tape from sensor orifice and close pressure sensor door 40 Part Two ww yv Figure 8 Pressure sensor door slid open Sensor span NOTE Always take a sensor zero prior to adjusting the sensor span A smoke test and a comparison measurement by an air velocity meter are required to calibrate the pressure sensor The air velocity meter only gives a velocity reading so a smoke test must be performed to determine pressure direction WARNING The span can only be adjusted in the same pr
55. room is under positive pressure Figure 1 gives a graphic example of positive and negative room pressure User Basics 1 An example of negative pressure is a bathroom with an exhaust fan When the fan is turned on air is exhausted out of the bathroom creating a slight negative pressure when compared to the hallway This pressure differential forces air to flow from the hallway into the bathroom The SUREFLOW device informs the laboratory users when the laboratory is under proper pressure and provides alarms when the room pressure is inadequate If the room pressure is in the safe range a green light is on If the pressure is inadequate a red alarm light and audible alarm turn on The SUREFLOW consists of two pieces a pressure sensor and Digital Interface Module DIM Adaptive Offset Controller AOC The AOC is internally part of the DIM module The components are typically located as follows pressure sensor above the laboratory entrance DIM AOC is mounted close to the entrance to the laboratory The pressure sensor continuously measures the room pressure and provides room pressure information to the DIM AOC The DIM AOC continuously reports the room pressure and activates the alarms when necessary The DIM AOC controls the supply and exhaust dampers to maintain the pressure differential The DIM AOC is a closed loop controller that is continuously measuring reporting and controlling room pressure Useful User Information The DIM
56. se the control signal to now open the damper NOTE Changing the CONTROL SIG changes both the supply and exhaust damper directions If only one damper needs to change direction change that actuator jumper instead of changing the CONTROL SIG ITEM RANGE DEFAULT bold 1 to 10 bars 5 bars 0 to 10 bars 5 bars Direct or Reverse Direct Part Two CONTROL MENU continued SOFTWARE NAME Ke VALUE Ti VALUE primary flow control loop ITEM DESCRIPTION WARNING The Ke VALUE and Ti VALUE allow you to manually change the primary PID control loop variables DO NOT CHANGE THESE VALUES UNLESS YOU HAVE A THOROUGH UNDERSTANDING OF PID CONTROL LOOPS CONTACT TSI FOR ASSISTANCE PRIOR TO CHANGING ANY VALUES Contact TSI for assistance in determining your control problem and for instructions on how to change a value Incorrectly changing a value will result in poor or non existent control Suggestion Before changing Kc or Ti change the SPEED or adjust the SENSITIVITY to try to eliminate the problem The Kc VALUE item changes the gain control coefficient of the primary control loop flow tracking loop When this item is entered a value for Kc is indicated on the display If the AOC is not controlling correctly the Ke gain control coefficient may need adjusting Decreasing Kc will slow the control system down which will increase stability Increasing Ke will increase the control system which may cause system instabili
57. ss code is OFF The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu Technical Section 29 INTERFACE MENU SOFTWARE NAME NET PROTOCOL NETWORK PROTOCOL NET ADDRESS NETWORK ADDRESS ACCESS CODE END OF MENU 30 ITEM DESCRIPTION The NET PROTOCOL item selects the communications protocol used to interface with the building management system The NET ADDRESS item is used to select the main network address of the individual room pressure device Each unit on the network must have its own unique address The values range from 1 247 If RS 485 communications are being used then a unique NET ADDRESS must be entered into the unit There is no priority between the RS 485 and keypad The most recent signal by either RS 485 or keypad will initiate a change RS 485 communications allows you access to all menu items except calibration and control items The RS 485 network can initiate a change at any time The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access toa menu If the ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can eit
58. ssure and flow alarms The MUTE TIMEOUT item sets the length of time the audible alarm is off for all pressure and flow alarms The display can only show one alarm message Therefore the controller has an alarm priority system with the highest priority alarm being displayed If multiple alarms exist the lower priority alarms will not display until after the highest priority alarm has been eliminated The alarm priority is as follows Pressure sensor low alarm Pressure sensor high alarm Low supply flow alarm Low exhaust flow alarm Data error The low and high pressure alarms are absolute values The chart below shows how the values must be programmed in order to operate correctly 0 2 inches H O 0 0 2 inches H O maximum negative maximum positive High Negative Low Zero Low Positive High Negative Set point Negative Positive Set point Positive Alarm Alarm Alarm Alarm The value of each set point or alarm is unimportant except for small dead band in graph above It is important to understand that the negative positive low alarm must be between zero 0 pressure and the negative positive set point and that the high alarm is a greater negative positive value than set point Technical Section 19 CONFIGURE MENU SOFTWARE NAME DISPLAY AVG DISPLAY AVERAGE UNITS ROOM VOLUME EXH CONFIG GENERAL EXHAUST DUCT CONFIGURATION ACCESS CODE END OF MENU 20 ITEM DESCRIPTION The DISPLAY AVG item sele
59. sure based flow stations need to have a SP1 FLO ZERO established on initial set up Linear flow stations with a 1 5 VDC output also need to have a SP1 FLO ZERO established Linear flow sup stations with a 0 5 VDC output do not need a SP1 FLO ZERO The FLO STA TYPE item is used to select the flow station input signal PRESSURE is selected when TSI flow stations with pressure transducers are installed LINEAR is selected when a linear output flow station is installed 0 5 VDC Typically a thermal anemometer based flow station The TOP VELOCITY item is used to input the maximum velocity of a linear flow station output A TOP VELOCITY must be input for the linear flow station to operate NOTE This item is disabled if a pressure based flow station is installed The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access toa menu Ifthe ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu Technical Section ITEM RANGE DEFAULT bold 0 10 square feet 0 0 9500 square meters The DIM does not compute duct area The area must be first calculated and then entered into
60. tations 0 to TOP VELOCITY times the supply duct area in square feet TY square meters m OFF 17 ALARM MENU continued SOFTWARE NAME ALARM RESET AUDIBLE ALM AUDIBLE ALARM ALARM DELAY ALARM RELAY MUTE TIMEOUT ACCESS CODE END OF MENU 18 ITEM DESCRIPTION The ALARM RESET item selects how the alarms terminate after the unit returns to control set point pressure or flow UNLATCHED alarm follow automatically resets the alarms when the unit reaches control set point LATCHED requires the staff to press the RESET key after the unit returns to control set point The ALARM RESET affects the audible alarm visual alarm and relay output which means all are latched or unlatched The AUDIBLE ALM item selects whether the audible alarm is turned ON or OFF Selecting ON requires the staff to press the MUTE key to silence the audible alarm Selecting OFF permanently mutes all audible alarms except when the EMERGENCY key is pressed The ALARM DELAY determines the length of time the alarm is delayed after an alarm condition has been detected This delay affects the visual alarm audible alarm and relay outputs An ALARM DELAY prevents nuisance alarms from people entering and leaving the laboratory The ALARM RELAY item selects which alarms activate the relay contacts pins 13 14 and 25 26 Selecting PRESSURE triggers the relays when a pressure alarm is present Selecting FLOW triggers the rela
61. ter and how to adjust the zero and span to obtain an accurate calibration This section also describes how to zero a TSI flow station transducer The Maintenance and Repair Part section covers all routine maintenance of equipment along with a list of repair parts Software Programming Programming the SUREFLOW is quick and easy if the programming keys are understood and the proper key stroke procedure is followed The programming keys are defined first followed by the required keystroke procedure At the end of this section is a programming example NOTE The unit is always operating while programming unit except when checking the control outputs When a menu item value is changed the new value takes effect immediately after saving the change NOTE This section covers programming the instrument through the keypad and display If programming through RS 485 communications use the host computer s procedure The changes take place immediately upon saving data Technical Section 7 Programming Keys The four keys with blue characters refer to Figure 4 are used to program or configure the unit to fit your particular application Programming the instrument will change how the unit functions so thoroughly review the items to be changed ENO MUTE A TEST RESET SELECT T Figure 4 Programming Keys MENU Key The MENU key has three functions l The MENU key is used to gain access to the menus when the unit is in the normal
62. the general exhaust duct size The duct size is needed to compute the total general exhaust flow out of the laboratory This item requires a flow station to be mounted in each general exhaust duct If the DIM displays English units area must be entered in square feet If metric units are displayed area must be entered in square meters The EX1 FLO ZERO item establishes the flow station zero flow point A zero or no flow point needs to be established in order to obtain a correct flow measurement output see Calibration section All pressure based flow stations need to have an EX1 FLO ZERO established on initial set up Linear flow stations with a 1 5 VDC output also need to have an EX1 FLO ZERO established Linear flow stations with a 0 5 VDC output do not need a EX1 FLO ZERO The FLO STA TYPE item is used to select the flow station input signal PRESSURE is selected when TSI flow stations with pressure transducers are installed LINEAR is selected when a linear output flow station is installed 0 5 VDC Typically a thermal anemometer based flow station The TOP VELOCITY item is used to input the maximum velocity of a linear flow station output A TOP VELOCITY must be input for the linear flow station to operate NOTE This item is disabled if a pressure based flow station is installed The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access toa
63. the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu ITEM RANGE DEFAULT bold 0 75 1 2 3 5 10 20 or 40 seconds 20 seconds FT MIN m s H O Pa mm H O H O 0 100 000 cubic feet 0 3000 cubic meters 0 The DIM does not compute volume The volume must be first calculated and then entered into the DIM SEPARATE or COMBINED SEPARATE ON or OFF OFF Part Two CALIBRATION MENU SOFTWARE NAME SENSOR ZERO SENSOR SPAN ELEVATION ACCESS CODE END OF MENU ITEM DESCRIPTION The SENSOR ZERO item is used to calibrate the TSI pressure sensor A sensor zero should be established prior to adjusting the sensor span see Calibration section following menu item section The SENSOR SPAN item is used to match or calibrate the TSI pressure sensor velocity sensors to the average room pressure velocity as measured by a portable air velocity meter A sensor zero should be established prior to adjusting the sensor span if the sensor was cleaned with a liquid cleaner see Calibration section following menu item listing The ELEVATION item is used to enter the elevation of the building above sea level This item has a range of 0 10 000 feet in 1 000 foot increme
64. the unit 0 NONE PRESSURE or LINEAR PRESSURE 0 5 000 FT MIN 0 25 4 m s 0 ON or OFF OFF 33 Setup Checkout The AOC is easy to program and setup This section covers the theory of operation required software programming a programming example and how to verify checkout that the components are functioning correctly The AOC uses a unique control sequence that combines flow and pressure differential measurements to maintain air balance and laboratory pressure while interfacing with a thermostat to maintain laboratory temperature The overall AOC control sequence seems quite complicated initially but the Theory of Operation section breaks the sequence down into sub sequences which simplifies the total system Theory of Operation The AOC control system requires the following measurement inputs to function correctly General exhaust flow measured with a flow station if general exhaust is installed Fume hood exhaust flow measured with a flow station Supply air flow measured with a flow station Temperature measured with a thermostat if temperature is incorporated into sequence Pressure differential with a TSI pressure sensor if pressure is incorporated into sequence Laboratory air balance Laboratory air balance is maintained by measuring the fume hood exhaust or other exhaust subtracting an offset flow from the fume hood total and then setting the supply air damper s to maintain the offset bet
65. to select the integral dead band The integral dead band determines when the controller uses integral control slow control and when the controller enters PID control fast control When this item is selected a bar graph will be shown on the display There are 10 bars total with each one representing 50 CFM Starting from the right side sign 10 bars displayed indicates no dead band so the controller is always in PID control mode Each bar missing represents 50 CFM of integral dead band The less bars displayed the larger the integral dead band For example with 8 bars displayed 2 bars missing and an offset of 500 CFM the integral dead band is between 400 and 600 CFM When the measured offset is within this range integral or slow control is used However when the flow offset falls below 400 CFM or rises above 600 CFM PID control is enabled until the unit returns within the dead band The SENSITIVITY item has a unique feature that when zero bars are displayed the unit never goes into PID control The control output is always a slow control signal WARNING When SENSITIVITY is set for 10 bars the system is always in PID control which will probably cause an unstable system It is recommended that SENSITIVITY be set at 9 bars or less The CONTROL SIG item determines the control signal s output direction As an example If the control system closes the exhaust damper instead of opening the damper this option will rever
66. tts max 4 9 in x 4 9 in x 1 35 in 0 7 Ib 55 to 95 F 0 16 watts at 0 inches H20 0 20 watts at 0 00088 inches HO 5 58 in x 3 34 in x 1 94 in 0 2 lb Electric or pneumatic Electric 24 VAC 7 5 watts max Pneumatic 24 VAC 3 watts max 0 volts damper closed 10 volts damper open Electric 1 5 seconds Pneumatic 5 seconds 45 Appendix B Wiring Information Back Panel Wiring Input Output Pina Communication Descrpion O DM aoe o SO NOTE 24 VAC becomes polarized when connected to DIM 6 8 0 mao E ROA RS 485 communications between DIM and pressure sensor 0 10 VDC general exhaust control signal 10 VDC open n o damper 2 9 1 11 12 Input 0 5 VDC flow station signal fume exhaust 13 14 Output Low alarm relay N O closes in low alarm condition ont mim LOW ALAR 15 16 17 18 19 20 21 22 23 24 25 26 Output High alarm relay N O closes in high alarm condition See menu item HIGH ALARM WARNING The wiring diagram shows polarity on many pairs of pins H N A B Damage to DIM AOC may occur if polarity is not observed Appendix B 47 225 WIG JINGOW JOVAYSLNI IYLI IC Ze 27008 N d YITIONLNOO vlv008 N d SR ft O 371997 lt cc YINYOISNVYL a a UU am NI 1NdNI MOTA TOYLNOO J A NG ATddNS dans Seysy P _l O LHM NYO L l J c OO e iz b 9 sz PE EZ zz TE oz 6l gL Zt co ee LU LNO
67. ty The Ti VALUE item changes the integral control coefficient of the primary control loop flow tracking loop When this item is entered a value for Ti is indicated on the display If the AOC is not controlling correctly the unit may have an inappropriate integral control coefficient Increasing Ti will slow the control system which will increase stability Decreasing Ti will increase the control system speed which may cause system instability Technical Section ITEM RANGE DEFAULT bold Ke 0 1000 Ti 0 1000 The range of values is very large Poor control will occur if values are more than twice or less than 1 2 the default value Ke 80 Ti 200 23 CONTROL MENU continued SOFTWARE NAME Ke OFFSET pressure control loop ACCESS CODE END OF MENU 24 ITEM DESCRIPTION WARNING The Kc OFFSET sets the pressure control PID variable DO NOT CHANGE THIS VALUE UNLESS YOU HAVE A THOROUGH UNDERSTANDING OF PID CONTROL LOOPS CONTACT TSI FOR ASSISTANCE PRIOR TO CHANGING ANY VALUES Contact TSI for assistance in determining your control problem and for instructions on how to change a value Incorrectly changing a value will result in poor or non existent control The Kc OFFSET item changes the gain control coefficient of the secondary control loop pressure control loop The pressure control loop is very slow when compared to the primary flow control loop This menu item should not be changed unless probl
68. uld be displayed The exact voltage displayed is relatively unimportant It is more important that the voltage is changing which indicates the flow station is working correctly 0 volts displayed equals zero flow 5 volts displayed equals 2832 ft min x duct area ft pressure based flow station 5 volts displayed equals TOP VELOCITY x duct area ft linear based flow station The EX1 FLOW IN menu item displays the current exhaust flow from a general exhaust This item is a diagnostics tool used to compare the general exhaust flow to a traverse of the duct work If flow error is greater than 10 adjust the EX1 DCT AREA until error is within 10 When a volt meter is hooked to the flow station output a voltage should be displayed The exact voltage displayed is relatively unimportant It is more important that the voltage is changing which indicates the flow station is working correctly 0 volts displayed equals zero flow 5 volts displayed equals 2832 ft min x duct area ft pressure based flow station 5 volts displayed equals TOP VELOCITY x duct area ft linear based flow station The SP1 FLOW IN menu item displays the current supply air flow This item is a diagnostics tool used to compare the supply flow to a traverse of the duct work If flow error is greater than 10 adjust the SP1 DCT AREA until error is within 10 When a volt meter is hooked to the flow station output a voltage should be displayed The exact voltage
69. ween supply air and fume hood exhaust The general exhaust damper is normally closed except when room pressure cannot be maintained This may occur when the fume hood sashes are all down and the supply air is at a minimum position The general exhaust damper opens to maintain the required offset and pressure differential Pressure control The pressure differential signal is sent to the AOC assumption laboratory is under negative pressure If pressure is at set point the control algorithm does nothing If pressure is not at set point the offset value is changed until pressure is maintained or the minimum or maximum offset value is reached If the offset value increases the supply air is reduced until one of 3 events occur Pressure set point is reached The AOC maintains the new offset The offset range is exceeded The offset will be at maximum attempting to reach pressure set point An alarm will trigger to inform you pressure differential is not being maintained Supply air minimum is reached The general exhaust begins to open was closed to maintain pressure differential decreases the supply air increases until one of 3 events occur Pressure set point is reached The AOC maintains the new offset The offset range is exceeded The offset will be at minimum attempting to reach pressure set point An alarm will trigger to inform you pressure differential is not being maintained Supply air maximum is reached The alarm will
70. ys when a low flow conditon exists This item only affects the relay contacts all audible and visual alarms are still active regardless of the ALARM RELAY status Pins 13 14 Low alarm relay Low pressure or low supply flow Pins 25 26 High alarm relay High pressure or low exhaust flow The MUTE TIMEOUT determines the length of time the audible alarm is silenced after the MUTE key is pressed This delay temporarily mutes the audible alarm NOTE Ifthe DIM is in alarm when MUTE TIMEOUT expires the audible alarm turns on When the pressure returns to the safe range the MUTE TIMEOUT is canceled If the room goes back into an alarm condition the MUTE key must be pressed again to mute the audible alarm The ACCESS CODE item selects whether an access code pass code is required to enter the menu The ACCESS CODE item prevents unauthorized access toa menu If the ACCESS CODE is ON a code is required before the menu can be entered Conversely if the ACCESS CODE is OFF no code is required to enter the menu The END OF MENU item informs you that the end of a menu has been reached You can either scroll back up the menu to make changes or press the SELECT or MENU key to exit out of the menu ITEM RANGE DEFAULT bold LATCHED OR UNLATCHED UNLATCHED ON or OFF ON 20 600 SECONDS 20 SECONDS PRESSURE or FLOW PRESSURE 5 to 30 MINUTES 5 MINUTES ON or OFF OFF Part Two ALARM CONSTRAINTS There are a number o

Model 8680 SureFlow Adaptive Offset Controller Operation

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