Unit installation

2 OMRCPMICRO
Table of Contents
Introduction............................................3
General Description...............................4
Features of the MicroTech Control Panel
.................................................................4
Optional Sensor Packages.....................5
Controller Layout...................................6
Component Data ....................................7
Installation and Maintenance..............10
Field Wiring ..........................................12
Software Identification.........................15
Controller Inputs/Outputs....................16
Remote Demand Limiting....................22
THR Heat/Cool Changeover...............23
Soft Loading .........................................23
Compressor Control.............................24
Lead-Lag of Refrigerant Circuits........25
Manual Operation................................25
Unit Status Modes ...............................26
Circuit Status Modes...........................27
Head Pressure Control.........................28
Pumpdown Control................................31
"Monitor Only" Sensors and Display
Items .....................................................31
Safety Systems .....................................32
Circuit Alarm Conditions......................33
System Alarm Conditions.....................35
Other Conditions ..................................36
Normal Sequence of Operation...........37
Start-Up and Shutdown.........................39
Keypad/Display....................................42
Password Information...........................43
Keypad Key Functions .........................43
Menu Descriptions ...............................45
MicroTech Keypad Directory..............50
Test Procedure - Trouble Analysis ......59
Testing Solid-State Relays...................64
MicroTech Monitoring and Networking
Options ..................................................65
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1997 McQuay International
"Information covers McQuay International products at the time of publication and we reserve the right
to make changes in design and construction at anytime without notice"