IOM 686 AGZ 030A through 065A 3
Introduction
General Description
McQuay Air-Cooled Global water chillers are complete, self-contained automatic refrigerating units.
Every unit is completely assembled, factory wired, charged, and tested. Each unit consists of twin Air-
Cooled condensers with integral subcooler sections, multiple tandem scroll compressors, replaceable
tube dual circuit shell-and-tube evaporator, and complete refrigerant piping. Liquid line components
include manual liquid line shutoff valves, sight-glass/moisture indicators, solenoid valves, and double
diaphragm hydraulic element thermal expansion valves. Other features include compressor crankcase
heaters, an evaporator heater for chilled water freeze protection, limited pumpdown during “on” or
“off” periods, compressor lead-lag switch to alternate the compressor starting sequence, and sequenced
starting of compressors.
The electrical control center includes all safety and operating controls necessary for dependable
automatic operation. Condenser fan motors are fused in all three phases and started by their own
three-pole contactors. Compressors are not fused but may be protected by optional circuit breakers.
Inspection
Check all items carefully against the bill of lading. Inspect all units for damage upon arrival. Report
shipping damage and file a claim with the carrier. Check the unit name plate before unloading, making
certain it agrees with the power supply available. McQuay is not responsible for physical damage after
unit leaves the factory.
Note: Unit shipping and operating weights are available in the Physical Data tables
beginning on page 13.
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