Product manual
2 IOMM ACR/AGR-1
Table of Contents
Introduction.........................................3
Inspection ...........................................................3
Installation...........................................4
Handling..............................................................4
Location...............................................................5
Service Access ...................................................5
Vibration Isolators..............................................7
Water Piping .......................................................8
Flow Switch.........................................................9
Glycol Solutions...............................................10
Evaporator Flow and Pressure Drop.............11
Refrigerant Piping ............................................13
Physical Data.....................................17
Electrical Data...................................22
Field Wiring.......................................................22
AGR-AM Data..................................................23
ACR Data ..........................................................23
Electrical Notes.................................................26
Wiring Diagrams ...............................................28
Dimensional Data..............................35
Startup ...............................................38
Pre Start-up .......................................................38
Start-Up .............................................................38
Shutdown ..........................................................38
Water Piping Checkout ...................................39
Refrigerant Piping Checkout ..........................39
Electrical Check Out.........................................40
Operation...........................................41
Hot Gas Bypass (Optional).............................41
Filter Driers........................................................41
System Adjustment..........................................42
Liquid Sightglass and Moisture Indicator...42
Refrigerant Charging .......................................42
Thermostatic Expansion Valve.......................42
Crankcase Heaters ...........................................42
DX Evaporator..................................................43
Sequence of Operation....................................43
UNT Controller, AGR-AM ...............45
General Description .........................................45
Optional Sensors..............................................45
Controller Inputs /Outputs .............................47
UNT Controller Features.................................51
Alarms ................................................................53
ZONE TERMINAL (optional) ........................53
Zone Terminal Glossary ..................................57
Global UNT Controller Troubleshooting
Chart...................................................................59
MicroTech Controller.......................61
General Description .........................................61
Optional Sensor Packages ..............................61
Installation ........................................................61
Sequence of Operation....................................70
Start-Up and Shutdown ..................................72
Keypad / Display .............................................73
Menu Descriptions..........................................76
MicroTech Controller Trouble Analysis .......87
Test Procedures................................................90
Unit Maintenance..............................97
Preventative Maintenance Schedule ............98
Service ...............................................99
Liquid Line Solenoid Valve.............................99
Evaporator.......................................................100
Refrigerant Charging .....................................100
AGR Troubleshooting Chart ........................102
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1997 McQuay International
"Illustrations and data cover the McQuay International products at the time of publication and we reserve the
right to make changes in design and construction at anytime without notice"