Operating instructions

Table of Contents
Pre Start-up................................................................59
Introduction.................................................... 3
Start-Up.....................................................................59
General Description.....................................................3
Shutdown...................................................................60
Inspection ....................................................................3
Water Piping Checkout..............................................60
Nomenclature ..............................................................3
Refrigerant Piping Checkout.....................................60
Electrical Check Out .................................................61
Installation...................................................... 4
Handling ......................................................................4
Operation...................................................... 61
Location.......................................................................5
Hot Gas Bypass (Optional)........................................61
Sound Isolation..........................................................12
VFD Low Ambient Control (Optional).....................62
Vibration Isolators .....................................................12
Filter-Driers (AGZ-BM)............................................62
Ambient Temperature and Water Flow Limitations...14
System Adjustment....................................................62
Water Piping (Model AGZ-BM)................................14
Liquid Line Sight Glass and Moisture Indicator.......62
ACZ Staging and Circuiting......................................21
Refrigerant Charging.................................................62
Remote Evaporator Refrigerant Piping .....................22
Thermostatic Expansion Valve..................................62
Chilled Water Flow Switch........................................24
Crankcase Heaters.....................................................63
Evaporator Flow and Pressure Drop..........................25
Unit Maintenance......................................... 64
Wind Baffles and Hail Guards...................................26
Preventive Maintenance Schedule.............................65
Physical Data................................................ 28
Service........................................................... 66
Electrical Data Standard Ambient ............. 33
Liquid Line Solenoid Valve.......................................66
Remote Evaporator (AGZ-BM Only) .......................67
Electrical Data High Ambient..................... 43
Refrigerant Charging.................................................67
Dimensional Data......................................... 52
Warranty Statement .................................... 68
Remote Evaporators ..................................................55
ACZ/AGZ Troubleshooting Chart ............. 69
Optional Features......................................... 56
Start-up ......................................................... 59
Unit controllers are LONMARK
certified with an optional
LONWORKS communication
Manufactured in an ISO Certified facility
"McQuay" is a registered trademark of McQuay International
©2004 McQuay International
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.
2 ACZ / AGZ-BM IMM ACZ/AGZ-4