McQuay MicroTech II Installation Manual

IM 781-2 Page 3
Hardwired Chiller Remote I/O Module Analog Inputs ........................................................................47
Chiller % RLA (AI 1) ......................................................................................................................47
Chillers With % RLA Output ...................................................................................................................... 47
Chillers Without % RLA Output................................................................................................................. 48
Chiller Leaving Evaporator and Leaving Condenser Water Temperatures (AI 3 and AI 4) ............49
Hardwired Chiller Remote I/O Module Digital Inputs.........................................................................50
Evaporator and Condenser Flow Proving (DI 1 and DI 2)...............................................................50
Hardwired Chiller Alarms (DI 3 and optionally DI 4) .....................................................................50
Hardwired Chiller Remote I/O Module Analog Outputs .....................................................................50
Hardwired Chiller Leaving Water Temperature Setpoint Reset (AO 1) ..........................................50
Hardwired Chiller Load Limiting (AO 2) ........................................................................................51
Hardwired Chiller Remote I/O Module Digital Outputs ......................................................................51
Evaporator and Condenser Pump Control (Relay 1)........................................................................51
Evaporator and Condenser Pump Control (Relay 2 and Relay 3)....................................................51
Transformer Usage...............................................................................................................................51
Maintenance.........................................................................................................................54
Cleaning ...............................................................................................................................................54
Required Battery Maintenance.............................................................................................................54
Replacing the Battery...........................................................................................................................54
Parts List ..............................................................................................................................................55
Warranty...............................................................................................................................56
Warranty Return Material Procedure...................................................................................................56
Replacement Parts................................................................................................................................56
Index.....................................................................................................................................57
Figures
Figure 1. System Architecture...............................................................................................................6
Figure 2. Typical Chilled Water System...............................................................................................8
Figure 3. Parallel Configurations ..........................................................................................................9
Figure 4. Series/Parallel Configurations ...............................................................................................9
Figure 5. Combination Configurations..................................................................................................9
Figure 6. Common Primary Pump with Separate Isolation Valves .....................................................10
Figure 7. Fixed-Speed Secondary Pump .............................................................................................10
Figure 8. Variable-Speed Secondary Pump ........................................................................................10
Figure 9. Lead/Standby Secondary Pumps..........................................................................................11
Figure 10. Sequenced Secondary Pumps ............................................................................................11
Figure 11. Pressure-Controlled Loop Bypass .....................................................................................11
Figure 12. Mounting Guide.................................................................................................................14
Figure 13. Mounting Detail.................................................................................................................15
Figure 14. Immersion Sensor ..............................................................................................................17
Figure 15. Brass Thermowell..............................................................................................................17
Figure 16. Outdoor Air and/or Relative Humidity Sensor ..................................................................18
Figure 17. Singly Terminated Free Topology.....................................................................................21
Figure 18. Combining Network Segments with a Repeater ................................................................22
Figure 19. Bus Network Topology......................................................................................................22
Figure 20. Thermistor wiring ..............................................................................................................25
Figure 21. Analog Input 0-10VDC Wiring .........................................................................................26
Figure 22. Analog Input 4 to 20 mA Wiring.......................................................................................27
Figure 23. Digital Input Wiring ..........................................................................................................29
Figure 24. CSM Field Wiring Schematic............................................................................................30
Figure 25. CSM Remote I/O Modules A and B Field Wiring Schematic ...........................................35
Figure 26. CSM Remote I/O Modules C and D Field Wiring Schematic ...........................................36
Figure 27. CSM Remote I/O Modules E and F Field Wiring Schematic ............................................37
Figure 28. CSM Remote I/O Modules G and H Field Wiring Schematic...........................................38
Figure 29. Main Board Layout............................................................................................................44

McQuay MicroTech II Specifications

General

Brand	McQuay
Model	MicroTech II
Category	Controller
Language	English