Unit installation

2 ACZ / AGZ-BM IOMM ACZ/AGZ-3
Table of Contents
Introduction ....................................................3
General Description .................................................... 3
Inspection....................................................................3
Nomenclature..............................................................3
Installation ......................................................4
Handling...................................................................... 4
Location ...................................................................... 5
Sound Isolation ......................................................... 12
Vibration Isolators.....................................................12
Ambient Temperature and Water Flow Limitations... 14
Water Piping (Model AGZ-BM) ............................... 14
ACZ Compressor Staging .........................................21
Remote Evaporator Refrigerant Piping.....................21
Evaporator Flow and Pressure Drop ......................... 22
Wind Baffles and Hail Guards .................................. 24
Physical Data ................................................26
Electrical Data Standard Ambient..............31
Electrical Data High Ambient .....................41
Dimensional Data .........................................50
Remote Evaporators.................................................. 53
Optional Features.........................................54
AGZ MicroTech II¥
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¥ Controller..................57
Table of Contents ...................................................... 57
Overview................................................................... 58
AGZ-B Inputs/Outputs.............................................. 58
Logging..................................................................... 62
Control Logic............................................................ 63
Chilled Water Pump Control..................................... 64
Compressor Control .................................................. 64
Standard Condenser Fan Control .............................. 68
Optional VFD Low Ambient Fan Control................. 69
Using the Controller.................................................. 78
Screen Definitions:....................................................81
View Menus .............................................................. 81
ACZ Microtech II
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 Controller ..................91
Table of Contents...................................................... 91
Overview................................................................... 92
ACZ-B Inputs/Outputs.............................................. 92
Setpoints ................................................................... 94
Logging..................................................................... 96
Control Logic............................................................ 96
Unit Mode Selection................................................. 97
Compressor Control.................................................. 97
Condenser Fan Control ........................................... 100
Optional VFD Low Ambient Fan Control............... 102
Using the Controller................................................ 112
Screen Definitions................................................... 115
Start-up........................................................123
Pre Start-up ............................................................. 123
Start-Up................................................................... 123
Shutdown ................................................................ 124
Water Piping Checkout ........................................... 124
Refrigerant Piping Checkout................................... 124
Electrical Check Out............................................... 125
Operation ....................................................125
Hot Gas Bypass (Optional)..................................... 125
VFD Low Ambient Control (Optional)................... 126
Filter-Driers (AGZ-BM) ......................................... 126
System Adjustment.................................................. 126
Liquid Line Sight Glass and Moisture Indicator..... 126
Refrigerant Charging............................................... 126
Thermostatic Expansion Valve................................ 126
Crankcase Heaters................................................... 127
Unit Maintenance.......................................128
Preventive Maintenance Schedule .......................... 129
Service .........................................................130
Liquid Line Solenoid Valve .................................... 130
Remote Evaporator (AGZ-BM Only) ..................... 131
Refrigerant Charging............................................... 131
Warranty Statement...................................132
ACZ/AGZ Troubleshooting Chart............133
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Illustrations and data cover McQuay International products at the time of publication and we reserve the right to
make changes in design and construction at anytime without notice.