McQuay AGZ 035A, Installation, Operation And Maintenance Manual

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2 AGZ 035A through 065A IOMM AGZ-3
Table of Contents
Introduction ....................................... 3
General Description..................................... 3
Inspection .................................................... 3
Nomenclature .............................................. 3
Installation ......................................... 4
Handling ...................................................... 4
Location....................................................... 5
Service Access ............................................. 5
Vibration Isolators ....................................... 7
Water Piping ................................................ 8
Flow Switch................................................. 9
Water Connections..................................... 10
Glycol Solutions ........................................ 10
Evaporator Flow and Pressure Drop...........11
Physical Data ................................... 13
Electrical Data ................................. 15
Field Wiring............................................... 15
Dimensional Data ............................ 28
Startup .............................................. 29
Pre Start-up................................................ 29
Start-Up ..................................................... 29
Shutdown................................................... 29
Water Piping Checkout .............................. 30
Refrigerant Piping Checkout ..................... 30
Electrical Check Out.................................. 31
Operation ......................................... 32
Sequence of Operation .............................. 32
Hot Gas Bypass (Optional)........................ 33
Filter Driers ............................................... 34
System Adjustment .................................... 34
Liquid Sightglass and Moisture Indicator.. 34
Refrigerant Charging.................................. 34
Thermostatic Expansion Valve................... 34
Crankcase Heaters...................................... 35
Water Cooler.............................................. 35
Global UNT Controller Installation
and Operation.................................. 36
General Description ................................... 36
Optional Sensors ........................................ 36
Controller Inputs /Outputs ......................... 38
Additional Global UNT Features............... 42
Alarms........................................................ 44
Zone Terminal (Optional) .......................... 45
Zone Terminal Glossary............................. 49
UNT Troubleshooting Chart ...................... 51
MicroTech Controller Installation
and Operation.................................. 52
General Description ................................... 52
Optional Sensor Packages.......................... 52
Installation ................................................. 52
Sequence of Operation............................... 61
Start-Up and Shutdown.............................. 63
Keypad / Display ....................................... 64
Menu Descriptions..................................... 67
Trouble Analysis for the MicroTech .......... 78
Test Procedures.......................................... 81
Unit Maintenance ............................ 88
Preventive Maintenance Schedule ............. 89
Service .............................................. 90
Liquid Line Solenoid Valve ....................... 90
Evaporator ................................................. 91
Refrigerant Charging.................................. 91
AGZ Troubleshooting Chart ...................... 93
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