McQuay AGR 090AS User Manual

2 AGR 055A through 100A IOMM AGR
Table of Contents
Introduction...................................... 3
General Description...................................3
Inspection ..................................................3
Installation........................................ 4
Handling....................................................4
Location.....................................................5
Service Access and Clearances...................5
Vibration Isolators......................................7
Water Piping..............................................8
Flow Switch...............................................9
Water Connections.....................................9
Refrigerant Charge.....................................9
Glycol Solutions.......................................10
Evaporator Water Flow and Pressure Drop12
Physical Data.................................. 13
Electrical Data................................ 16
Field Wiring.............................................16
Dimensional Data........................... 37
AGR Unit Start-Up........................ 39
Start-Up...................................................40
Shutdown.................................................40
AGR Unit Operation...................... 42
Sequence of Operation .............................42
Hot Gas Bypass (Optional).......................43
Filter Driers.............................................43
System Adjustment ..................................44
Liquid Sightglass and Moisture Indicator.44
Refrigerant Charging ...............................44
Thermostatic Expansion Valve.................44
Superheat and Subcooling........................44
Crankcase Heaters....................................44
Water Cooler............................................45
UNT Controller Operation .............46
General Description .................................46
Optional Sensors......................................46
Controller Inputs /Outputs........................48
Additional Global UNT Controller Features52
Alarms.....................................................54
ZONE TERMINAL (optional)..................55
Zone Terminal Glossary ...........................59
Global UNT Controller Troubleshooting
Chart........................................................61
MicroTech Controller Installation
and Operation.................................63
General Description .................................63
Optional Sensor Packages ........................63
Installation...............................................63
Sequence of Operation..............................72
Start-Up and Shutdown............................74
Keypad / Display......................................75
Menu Descriptions...................................78
Trouble Analysis for the AGR MicroTech
Controller.................................................89
Test Procedures ........................................92
Unit Maintenance ...........................99
Preventative Maintenance Schedule........100
Unit Service...................................101
Liquid Line Solenoid Valve....................101
Evaporator .............................................102
Refrigerant Charging .............................102
AGR Troubleshooting Chart...................104
Notes..............................................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"

McQuay AGR 090AS Specifications

General

Brand	McQuay
Model	AGR 090AS
Category	Chiller
Language	English