Unit installation

2 IOMM ACZ/AGZ
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.........12
Refrigerant Piping ...................................13
Physical Data...................................19
Electrical Data.................................22
Field Wiring ............................................22
Electrical Data AGZ-AM......................... 23
Electrical Data ACZ ................................23
Electrical Notes........................................ 25
Wiring Diagrams ..................................... 27
Dimensional Data............................38
Startup.............................................40
Pre Start-up .............................................40
Start-Up................................................... 40
Shutdown................................................. 40
Water Piping Checkout ............................ 41
Refrigerant Piping Checkout.................... 41
Refrigerant Charging............................... 42
Electrical Check Out................................ 43
Operation ........................................44
Sequence of Operation ............................. 44
Hot Gas Bypass (Optional)....................... 45
Filter Driers.............................................46
System Adjustment ..................................46
Liquid Sightglass and Moisture Indicator.46
Thermostatic Expansion Valve.................46
Crankcase Heaters....................................47
Water Cooler............................................47
Global UNT Controller, AGZ-AM .48
General Description .................................48
Optional Sensors......................................48
Controller Inputs /Outputs........................50
Additional UNT Features.........................53
Alarms.....................................................55
ZONE TERMINAL (optional) .................56
Zone Terminal Glossary...........................60
Global UNT Controller Troubleshooting
Chart .......................................................62
MicroTech Controller, AGZ-AM....63
General Description .................................63
Optional Sensor Packages ........................63
Installation...............................................63
Sequence of Operation .............................72
Start-Up and Shutdown............................74
Keypad / Display......................................75
Menu Descriptions...................................79
Trouble Analysis for the AGZ MicroTech
Controller ................................................90
Test Procedures........................................93
Unit Maintenance.........................100
Preventative Maintenance Schedule ....... 101
Service...........................................102
Liquid Line Solenoid Valve....................102
Evaporator ............................................. 103
Refrigerant Charging .............................103
Troubleshooting Chart ........................... 105
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1997 McQuay International
"Illustrations cover the general appearance of McQuay International products at the time of publication and we
reserve the right to make changes in design and construction at anytime without notice"