Operating Manual OMRCPMICRO Group: Chiller Part Number: 585571Y Effective: July 2000 Supersedes: IM 493-4 MicroTech Reciprocating Chiller / Templifier Control Models ALR 032 D/E thru 185 D/E Models WHR 040 D/E thru 210 D/E Models THR 040 D/E thru 210 D/E © 1999 McQuay International
Table of Contents Introduction............................................ 3 Head Pressure Control.........................28 General Description............................... 4 Pumpdown Control................................31 Features of the MicroTech Control Panel ................................................................. 4 "Monitor Only" Sensors and Display Items .....................................................31 Optional Sensor Packages..................... 5 Safety Systems .......
Introduction This manual provides installation, setup and troubleshooting information for the MicroTech controller provided on McQuay reciprocating compressor chillers. Please refer to unit installation manuals for unit application information as well as water and refrigerant piping details. All operating descriptions contained in this manual are based on MicroTech controller software version RCPXX02G. Chiller operating characteristics and menu selections may vary with other versions of controller software.
General Description The MicroTech Unit Control Panel, available on some McQuay ALR, WHR, and THR products, contains a Model 250 microprocessor based controller which provides all monitoring and control functions required for the safe, efficient operation of the unit. The operator can monitor all operating conditions by using the panels built in 2-line by 16-character display and keypad or by using an IBM compatible computer running McQuay Monitor software.
Optional Sensor Packages Water and air sensor package Air-cooled units: Ø Ø Entering evaporator water temperature Ambient outside air temperature Water-cooled units only: Ø Ø Ø Entering evaporator water temperature Entering condenser water temperature Leaving condenser water temperature Refrigerant sensor package Ø Ø Ø Ø Suction line temperature, circuit #1 Suction line temperature, circuit #2 Liquid line temperature, circuit #1 Liquid line temperature, circuit #2 (Provides direct display of subcool
Controller Layout All major MicroTech components are mounted inside the control section side of the unit's control cabinet. The individual components are interconnected by ribbon cables, shielded multi-conductor cables or discrete wiring. Power for the system is provided by transformers T-2 and T-4. All field wiring must enter the control cabinet through the knockouts provided and is terminated on field wiring terminal strips.
Component Data Microprocessor control board The Model 250 Microprocessor Control Board contains the electronic hardware and software necessary to monitor and control the unit. The microprocessor control board receives input from the Analog/Digital Input Board (ADI) and sends commands to the output board, maintaining the unit's optimum operating mode for the current conditions. Status lights mounted on the control board indicate operating condition of the microprocessor.
Table 1, Continued from previous page Temp Temp Resistanc °F °C e Ohms 9 -12.8 19,332 10 -12.2 18,747 11 -11.7 18,182 12 -11.1 17,636 13 -10.6 17,108 14 -10.0 16,597 15 -9.4 16,104 16 -8.9 15,627 17 -8.3 15,166 18 -7.8 14,720 19 -7.2 14,288 20 -6.7 13,871 21 -6.1 13,467 22 -5.6 13,076 23 -5.0 12,690 24 -4.4 12,333 25 -3.9 11,979 26 -3.3 11,636 27 -2.8 11,304 28 -2.2 10,983 29 -1.7 10,672 30 -1.1 10,371 31 -0.6 10,079 32 0.0 9,797 33 0.6 9,523 34 1.1 9,258 35 1.7 9,002 36 2.2 8,753 37 2.8 8,512 38 3.
Figure 3, Evaporator transducer OMRCPMICRO Figure 4, Condenser transducer 9
Installation and Maintenance The MicroTech controller is factory tested and configured for the unit being controlled. Sensors and transducers Sensors and transducers are mounted and connected to the MicroTech ADI board with shielded cable. Transducers are on Shrader fittings and sensors are in wells except the optional suction and liquid line sensors (in the refrigerant sensor package). The suction and liquid line sensors are placed in a copper sleeve that is brazed to the copper tubing.
harness, and installation instruction can be installed in the field or at the factory. Modem wiring is shown on the MicroTech wiring schematic. For more information, see "Telephone Line" in the Field Wiring section on page 14. Optional sensors Optional sensor kits, available from the factory, can be installed in the field. Thermistors in the optional sensor kit are negative coefficient type and have the same characteristics (see Table 1) as the thermistors used on McQuay centrifugal chillers.
Field Wiring Interconnecting wiring for the reciprocating control panel consists of: Ø Ø Ø Ø Ø Ø Ø Ø 115 VAC power wiring Analog input signals Digital input signals Digital output signals Condenser pump Fan starter Communications to a personal computer Telephone line for remote modem access See Figure 5 and unit field wiring diagrams at the end of this manual for more details.
Digital input signals Remote contacts for all digital inputs into the MicroTech controller must be dry contacts suitable for the 24 VAC control signals from the reciprocating control panel. Do not connect 120 VAC control power to these or any other connecting circuits. Remote stop/start If remote stop/start control is preferred, then remove the jumper between terminals #140 and #141 on TB7. When the remote stop/start switch is open, the controller will be in the "off: remote Sw" mode.
of 1.8 amps at 120 VAC. The terminals are wired in parallel with the compressor outputs so the coils will be energized with the first compressor stage. To start a condenser pump, install a jumper between terminals #11 and #12 and connect a single starter between terminals #11 and #16 on TB2. When either of the lead compressor start, the condenser pump will start. To start a fan, connect the first fan of circuit #1 to terminals #11 and #16 on TB2.
Software Identification Control software is factory installed and tested in each panel prior to shipment. The software is identified by a program code which is printed on a small label attached to the controller. The software version may also be displayed on the keypad display be viewing the last menu item in the Misc Setup menu (menu 23). The software "version" is the 6th and 7th digit of the software identification. In this example, the version is "02" and the revision to the software is "G".
Controller Inputs/Outputs Analog inputs Analog inputs are used to read the various temperatures and pressures on the chiller as well as any customer supplied 4-20mA reset signals. The controller's internal regulated 5 VDC and 12 VDC supplies provide the correct operating voltage for the sensors. See Table 2 for details. Input No. 16 Description 0 Leaving evaporator water temperature - Sensor is located in the leaving chilled water nozzle. The signal is used for capacity control and freeze protection.
16 Liquid line temp circuit #2 (optional) - Sensor located in a copper sleeve brazed to the circuit #2 liquid line measures refrigerant temperature to calculate subcooling. This sensor is used for monitoring purposes only.
Relay board outputs All of the MicroTech panel outputs are controlled by solid-state relays which are driven by the model 250 controller. The controller activates a solid-state relay by sending a "trigger" signal to the output board via the attached ribbon cable. The relay responds to the trigger by lowering its resistance which allows current to flow through its "contacts". When the controller removes the trigger signal, the relay's resistance becomes very high, causing the current flow to stop.
7 Cooling Compressor 2 Unloader 1 8 Cooling Not Used 9 Cooling Not Used 10 Condenser Fan(s) M12 k Condenser Fan(s) M13 k Condenser Fan(s) M14 k Condenser Fan(s) M22 k Condenser Fan(s) M23 k Condenser Fan(s) M24 k 11 12 13 14 15 Same Compressor 2 Unloader 1 Compressor 1 Unloader 2 Compressor 2 Unloader 2 Same Compressor 2 Unloader 1 Compressor 3 Circuit 1 Compressor 4 Circuit 2 Same Same Same Same Same Same Same Same Same Same Same Same Same Same Same Same Note: kCondenserless W
Figure 7, Leaving water reset Ice (remote reset signal) When in "Ice" mode, all compressors will run 100% loaded (that is no unloaders energized) to make certain that compressors cool appropriately. As a result, the number of stages in "Ice" mode will equal the number of compressors. Use approved solutions in the chilled water loop to protect the system to at least 15°F lower than the ice setpoint. When Leaving Evaporator Water (Lvg Evap") is set less than 34°F, "Ice" mode must be used.
1. "Frz Stat": Set to the saturated refrigerant pressure that corresponds to a temperature equal to 13.5°F below the ice set point. For example, if the ice set point is 23°F, the "Frz Stat" would be set at 33 psig, (which is 23°-13.5° = 9.5°F; 33 psig is R-22 saturation pressure at 9.5°F). 2. "Frze H2 O": Set at least 4°F below the ice set point, but not lower than the freezing point of the solution. In this example, the "Frze H2 O" would be set at 19°F. 3.
Remote Demand Limiting Demand limiting applies to ALR and WHR chillers only. Remote demand limiting may be accomplished by connecting to terminals #131 and #132 on TB7. A 4-20mA signal is required. Based on the 4-20mA signal, demand limiting will cause the chiller to limit the total number of stages regardless of the amount of cooling actually required. A signal of 4mA or less allow all stages to operate while a 20mA or more will allow only one stage to operate.
THR Heat/Cool Changeover On THR heat pumps, instead of the demand limit input, a 0 to 5 volt signal from a front panel unit-mounted switch allows the unit to run in heat and cool modes. Five volts is obtained at terminal #215, wired through the unit mounted switch and then connected to terminal #132 on TB7. When the switch is "open", the unit is in heating mode. When the switch is "closed" the unit is in cooling mode. Menu #18 shows which mode the unit is in.
Compressor Control The compressor staging logic uses an adjustable control band and interstage timer to determine the correct number of cooling or heating stages to activate. A project-ahead temperature calculation and a maximum pull down rate provide stable operation. Compressor set points are shown on Menu 16. The Control Band is the temperature range on either side of the active leaving water set point that must be exceeded for a stage change to occur.
Lead-Lag of Refrigerant Circuits Automatic The controller provides automatic lead-lag of refrigeration circuits. The circuit having the fewest number of starts on all compressors in the circuit will be started first. Changes to circuit capacity will be made by changing the position of the compressor unloaders when applicable. Compressors will be selected by changing unloader status. This prevents short-cycling of compressors when the cooling load is low.
Unit Status Modes The operating status of the unit is displayed on the keypad/display when the information is requested by the operator. Description of each Unit Status Mode are listed below. "Off: Remote SW" mode Upon start-up, the panel will check the "Remote Stop Switch" digital input. If the switch is open, the controller will be in the "Off: Remote SW" mode. Note that from the factory, the unit will ship with a mechanical jumper between the field terminals.
"Stage Up", "Stage Down" - These are momentary operating modes indicating a stage up or stage down is being initiated by the controller. "Off: System Sw" mode - Upon start-up the panel will check the front panel "System Switch" position. If the switch is in the "stop" position, the mode will be "Off: System Sw". Circuit Status Modes The operating status of each refrigeration circuit is displayed on the keypad/display when the information is requested by the operator.
Head Pressure Control Air-cooled units only (ALRs & WHRs with remote condensers) For each circuit, the first stage of condenser fans is wired in parallel with the compressor output so that they are energized with the first compressor stage. The fans for each circuit are controlled independently, but use the same Head Pressure Set Points for staging. The transducers responsible for measuring condenser pressure are mounted on the head of the lead compressors' discharge.
for each circuit and are based on the current evaporator pressure, the point on the minimum lift pressure line at which the unit is currently operating, and the current dead band being used. The "MinCondPr" equals the current evaporator pressure plus the point value on the minimum lift pressure line at which the unit is currently operating. Since the pressure scale in Figure 11 is referenced to evaporator pressure, the "MinCondPr" is represented by the minimum lift pressure line in Figure 11.
WHR units with remote condenser For WHR split systems, fan staging for remote condensing units is controlled in the same manner as ALR units as explained above. The unit must be declared as air cooled on the Misc Setup Menu 23. Also on Menu 23, the number of fan stages should be set to a value equaling the number of fan contactors per circuit minus one. The MicroTech controller works in conjunction with the required field wiring from the controller's relay board to the fan contactors.
Pumpdown Control Pumpdown of each refrigerant circuit will always occur when the circuit is commanded from a "Staging" mode to an "Off: Ready" mode. The pumpdown sequence closes the solenoid valve and the lead compressor in the circuit is used to perform the pumpdown. The compressor is fully loaded during pumpdown if unloaders are present. An alarm condition in the refrigerant circuit will disable the pumpdown sequence.
Safety Systems MicroTech continuously performs self-diagnostic checks, monitoring all system temperatures, pressures and safeties, and will automatically shut down a refrigerant circuit or the entire unit should a fault occur. The cause of the shutdown, time and date of occurrence and limited conditions at the time of alarm will be retained in memory and can be displayed for operator review. Current alarm conditions are displayed on Menus 24 and 25 by pressing the "Alarms" category on the keypad.
Circuit Alarm Conditions The "Circuit Alarm Conditions" are those alarms which only affect one circuit and cause the compressors of the affected circuit to be staged down (pre-alarm condition), temporarily shut off (autoclearing alarm) or locked out (alarm condition), whichever applies. If a pre-alarm condition occurs, MicroTech will display the appropriate message and the "Alarm Status" light will pulse until the condition is corrected or the unit goes into full alarm.
Low evaporator pressure If during a non-low ambient start, the evaporator pressure fails to rise above the Low Pressure Cut In Alarm Set Point (LP CutIn) within 80 seconds of the liquid line solenoid valve opening or, if during the cooling mode the evaporator pressure falls below the Low Pressure Cut Out Alarm Set Point (LP CutOut), a "Lo Evap Pressure" alarm will be generated. This alarm will also occur if the evaporator pressure drops to 2 psi for more than 20 seconds during low ambient start.
System Alarm Conditions The "System Alarm Conditions" are those alarms which are common to both refrigeration circuits and require all compressors to be temporarily shut off or locked out, whichever applies. The following alarm conditions are checked continuously during all modes of operation by the controller. If one of the following alarm conditions is detected, the mode of the controller will switch to "Off: Alarm".
Other Conditions Low source water temperature (THRs only) This is not an alarm condition. This condition is applicable only when the unit operation of "ChlTmp" is selected from Menu 23 and the unit is run in heating mode. If the leaving evaporator water temperature drops below the "LoSourcT" alarm setpoint, all running compressors will run unloaded.
Normal Sequence of Operation The following sequence of operation is typical of McQuay models ALR035D through ALR185D and WHR040E through WHR210E reciprocating water chillers and THR040D through THR170D Templifiers. The sequence may vary depending on various options which may be installed on the chiller.
Start-up (THRs operated in heating mode) If none of the "off" conditions are true, the MicroTech controller will initiate a start sequence. The chilled water pump output relay is energized any time the Templifier is enabled, the Templifier will remain in the Waiting For Flow mode until the field installed flow switch indicates the presence of chilled water flow.
Pumpdown As the system chilled water requirements diminish, the compressors will be unloaded. As the system load continues to drop, the liquid line solenoid valves will be de-energized and the refrigerant circuits will go through a PumpDown sequence. As the evaporator pressure falls below the LPCutOut Set Point while pumping down, the compressors and condenser fans will stop.
Powering the control panel Figure 13, Status LEDs Status LEDs—There are three Status LEDs located on the model 250 controller which will indicate the microprocessor's operating condition. When power is first applied to the control panel, the red RESET LED will illuminate for approximately 3 seconds. During this time, the microprocessor is checking the control software and performing internal hardware tests.
Start-up after temporary shutdown—Move the Circuit #1 and Circuit #2 pumpdown switches to the Auto position. If the controller is calling for cooling or heating, the compressors will start and the unit will stage up as required. If cooling or heating is not requested, the circuits may pump down and the compressors will stop. Extended shutdown CAUTION It is the operator's responsibility to provide protection against water circuit freezing on ALR units.
Keypad/Display Menu structure (general description) Figure 14, Keypad/display The information stored in the MicroTech controller can be accessed through the keypad using a tree-like structure. This tree structure is divided into Categories, Menus and Menu Items. There are three Categories which make up the tree structure: STATUS, CONTROL, and ALARM. Each category is divided into Menus and each Menu into Menu Items.
Password Information When changing any menu item entry, the user is prompted to enter the access password. The change will not be allowed until the correct password is entered. The password for ALR and WHR units is always the successive pressing of the following "ACTION" group keys: "Enter" "Enter" "Enter" "Enter" Once this has been done, the user can make changes to the menu item entries.
Item group The keys in this group are for stepping from item to item within a menu. Prev.—Pressing "PREV." shifts the display to the previous item in a menu. Note: When the first item in a menu is currently in the display, pressing "PREV." causing an "end of items" message to appear in the display pressing "PREV." again causes the display to wrap around to the last item in the menu. Next—Pressing "NEXT" shifts the display to the next item in a menu.
Menu Descriptions Status menus Menus 1 through 12 provide chiller operating information and display of sensor readings. The items listed under these status menus are effected by the settings under the associated control menus and are not directly adjusted via the keypad. Menu # 1: Unit Status —The unit operating status is displayed as item 1 within this menu. The second item is the number of seconds remaining in the unit interstage timer.
Control menus Menus 13 through 23 are the set point menus. All adjustable control parameters and set points, time schedules, control options, and alarm thresholds are accessed through these menus. CAUTION Any changes to these parameters must be determined and implemented by qualified personnel with a thorough understanding of how these parameters affect the operation of the unit. Negligent or improper adjustment of these controls may result in damage to the unit or personal injury.
Lvg Evap = Desired Ice Temp + 1/2 "CntrlBand+" + "ShutDn D-T" Lvg Evap = 21°F + 1/2 (4) + 1.5°F Lvg Evap 21 + 2 + 1.5 Lvg Evap = 24.5 For day operation the maximum chilled water reset (Menu 14 "MaxChWRst=") is added to the "Lvg Evap" as calculated above to reach the desired day operating leaving chilled water temperature. In Ice mode, do not unload, the MicroTech will shutdown whole circuits as the load drops off. This is necessary to maintain evaporator velocity for motor cooling and air return.
point sets the delay time between the current cooling stage and the next stage up request. The stage down request time delay is a fixed 1/3 ratio of the stage up delay. The minimum Start/Start and Stop/Start timers provide protection against compressor short cycling. During normal operation the Compressor Interstage Timers provide a time delay between cooling or heating stages. Menu #17: Head Pressure Set Points —The set points for head pressure control are adjusted from within this menu.
than one day, use the Incr and Decr keys to set the holiday duration and press Enter to store the information in the controller. Use the Next Item key to set additional holiday dates and durations for the entire year. Menu #22: Alarm Set Points —On a call for cooling or heating, the controller will open the liquid line solenoid valve. When the evaporator pressure rises above the Low Pressure CutIn set point, the first compressor will be started.
MicroTech Keypad Directory Table 7, Status menu Status Menus Menu No. Menu Line 1 Unit Status Item Line A. 2 Circ #1 Status A. 3 Circ #2 Status A. 4 Water Temp's A.
Status Menus Menu No. Menu Line 6 Circ #2 Pres's Item Line A. C. D. Evap ###.# psi 145 + Open Short Cnd ###.# psi 450 + Open Short MinCondPr=### MaxCondPr=### A. Satur Evap = B. SuctLine = C. Super Ht = D. Satur Cond = E. CondAppr = F. LiquidLn = G. Subcoolg = A. Satur Evap = B. SuctLine = C. Super Ht = D. Satur Cond = E. CondAppr = F. LiquidLn = G. Subcoolg = A. A. B. C. D. A. B. C. D. A.
Table 8, Control menu Status Menus Menu No. 13 Control Mode 14 LvgWater Spts 14** 15 16 Menu Line LvgWater Spts SoftLoad Spts CompressorSpt 17 Head Pres Spt 18 Demand Limits 18** Chiller/Templ 19 Time/Date 20 Schedule Item Line A. B. A. B. C. D. E. F. G. Manual Unit off Automatic Manual Staging AutoCirc#1-Off#2 OffCirc#1-Auto#2 Manual Stage = # Actv Spt = Lvg Evap = CntrlBand = StartUpD-T = ShutDnD-T = MaxPullDn = ResetOpt= H. I. J. A. B. C. D. E. F. G. H.
Status Menus Menu No. Menu Line Item Line Default Values Min-Max E. Tue Tue Tue Tue ##: - : :##- : : -##: : - :## 0 0 23 59 0-23 0-59 0-23 0-59 F.
Status Menus Menu No. 22 Menu Line Alarm Spts R-22 Item Line A. B. C. D. E. F. *G. LP CutIn = LP CutOut = Frz Stat = Frze H2O = FreezeTim = Hi Pres = LoSourcT = ## psi ## psi ## psi ##.# °F ### sec ### psi ##.# °F Default Values Min-Max 60 psi 34 psi 54 psi 34.0°F 80 sec 380 psi 40.0°F 42-70 20-55 20-54 N/A, 0.5-40 30-120 250-425 20-75 Switch Menu No.
Status Menus Menu No. Menu Line Item Line 22 Alarm Spts R-134a A. B. C. D. E. F. *G. LP CutIn = LP CutOut = Frz Stat = Frze H2O = FreezeTim = Hi Pres = LoSourcT = 23 Misc Setup A. Type = B. C. D. E. # Compressors = # Stages = # Fan Stages = Operation = F. OAT Select = G. # INDENT = H. Remote Cond = ## psi ## psi ## psi ##.# °F ### sec ### psi ##.# °F Air Cooled Water Cooled # # # Chl ChlTmp None Lcl Rmt RCP2E### RCP2S### Default Values Min-Max 30 psi 14 psi 26 psi 34.
Status Menus Menu No. Menu Line 25 #2 Curr Alarm 26 #1 Prev Alarm Item Line A. B. None HicondPresStgHld HicondPresStgDwn FreezeProtStgDwn LossofWaterFlow Can't Pump Down Freeze Stat Prot Lo Evap pressure Comp#4MtrProtect Comp#3MtrProtect Comp#2MtrProtect Comp#1MtrProtect Comp#4LowOil/Pwr Comp#3LowOil/Pwr Comp#2LowOil/Pwr Comp#1LowOil/Pwr Hi Cond Pressure Mech Hi Pressure Bad Evap PresSen Bad Cond PresSen BadPhase/Voltage WaterFreezeProt BadVoltsRatioSen Bad Lvg WaterSen @ ##:## - C. Evap = D.
Status Menus Menu No. Menu Line 27 #2 Prev Alarm Item Line A. B.
Figure 16, Keypad/menu structure 58 OMRCPMICRO
Test Procedure - Trouble Analysis All of the following procedures assume that power is applied to the MicroTech control panel and the circuit break (CB1) is on. Some of the following procedures require the removal or replacement of the controller, fuses, connectors, terminals or jumpers. Always shut off the power before making the required changes.
2. Remove the MCB Power In terminal strip connector and check for 9 VAC between the terminals on the plug corresponding to terminals 2 and 3 on the board (see MicroTech Schematics 1 and 2). Then check for 9 VAC between the terminals on the plug corresponding to terminals 1 and 3 on the board. Readings of 912 VAC are acceptable. If 9 VAC is present between both sets of terminals, go to step 3.
ADI board All digital and analog input signals are conditioned by the ADI Board. Power for the board is derived from the Microprocessor Control Board via the interconnecting ribbon cables. If the ADI Board appears inoperative, make sure these ribbon cables are fully seated in their sockets and the locking tabs are engaged. The digital inputs indicate the presence of 24 VAC by illuminating its corresponding LED. At 7.5 VAC to 24 VAC the digital input contacts are considered closed and the LED will be on.
Erroneous temperature readings and/or "Bad Lvg WaterSen" alarm condition If it is suspected that the controller is operating using erroneous temperature data or the control sensor alarm has tripped, the following procedure can be used to check for problems: 1. Remove power from the controller by opening circuit breaker CB1. Verify that the ribbon cable connections between the controller and the keypad/display and the controller and the ADI board are proper. Look for bent pins.
these items should be adjusted accordingly. Ice jobs are considered to be jobs in which the leaving chilled water set point is 34°F or less. Refer to the Reset Options section for information on ice job set points. 2. Check the Leaving Evaporator Set Points for the "ControlBand", the "StartUpD-T" (Start-up Delta-T) and the ShutDn D-T" (Shut Down Delta-T) on Menu 14. A good rule of thumb for the Control Band setting is to use the formula: TypicalControlBand = EvaporatorT + 0.
Testing Solid-State Relays The input resistance of most digital voltmeters is on the order of 10,000,000 to 12,000,000 ohms (10 to 12 megohms). Analog meters with 20,000 ohms/volt movements would have an input resistance of 5 megohms on the 250 volt scale. Connecting a voltmeter into the circuit adds very little load to the relay. When the solidstate relay switches to "off", the resistance increases to approximately 100K ohms.
MicroTech Monitoring and Networking Options PC monitoring A PC (personal computer) equipped with the appropriate Monitor software can be used to provide a high-level interface with a MicroTech network (see PC specification below). Monitor software features a Windows based display, multilevel password access, and advanced trendlogging. The PC can be connected to the Reciprocating MicroTech controller either directly, via one twisted pair, shielded cable, or remotely, via phone lines with an optional modem.
Figure 17, ALR and WHR MicroTech wiring 66 OMRCPMICRO
Figure 18, THR MicroTech wiring OMRCPMICRO 67
Figure 19, Electrical legend, ALR 68 OMRCPMICRO
Figure 20, Control wiring, ALR 035 - 070 OMRCPMICRO 69
Figure 21, 4-stage output, ALR 035 - 070 70 OMRCPMICRO
Figure 22, 6-stage output, ALR 050 - 070 OMRCPMICRO 71
Figure 23, Control wiring, ALR 085 - 185 72 OMRCPMICRO
Figure 24, 8-stage output, ALR 085 - 185 OMRCPMICRO 73
Figure 25, Field wiring, ALR 035 - 185 74 OMRCPMICRO
Figure 26, Electrical legend, WHR 040 - 210E and THR 040 - 110D OMRCPMICRO 75
Figure 27, Sensor location, ALR 035 - 185 76 OMRCPMICRO
Figure 28, Control wiring, WHR 040 - 085E and THR 040 - 110D OMRCPMICRO 77
Figure 29, 4-stage output, WHR 040 - 085E and THR 040 - 110D 78 OMRCPMICRO
Figure 30, 6-stage output, WHR 070 - 085E and THR 070 - 110D OMRCPMICRO 79
Figure 31, Control wiring, WHR 095 - 210E and THR 120 - 170D 80 OMRCPMICRO
Figure 32, 8-stage output, WHR 095 - 210E and THR 120 - 170D OMRCPMICRO 81
Figure 33, Field wiring, WHR 040 - 210E and THR 040 - 170D 82 OMRCPMICRO
Figure 34, Sensor location, WHR 040 - 210E OMRCPMICRO 83
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Post Office Box 2510, Staunton, Virginia 24402-2510 USA • (800) 432-1342 • www.mcquay.
