OM WGS-5
WGS 130A to 190A
3
Introduction
General Description
McQuay Model WGS water chillers are designed for indoor installations and are available
with factory-mounted water-cooled condensers (Model WGS AW), or arranged for use with
remote air-cooled or evaporative condensers (Model WGS AA). Each water-cooled unit
(WGS-AW) is completely assembled and factory wired before factory evacuation, charging
and testing. The units consist of two semi-hermetic rotary screw compressors, a two-circuit
shell-and-tube evaporator, two shell-and-tube water-cooled condensers, and complete
refrigerant piping.
Units manufactured for use with remote condensers (Models WGS-AA) have all refrigerant
specialties factory-mounted and have two sets of connection points for refrigerant discharge
and liquid lines to and from the remote condenser. Discharge valves are included
Each circuit’s liquid line components are manual liquid line shutoff valve, charging valve,
filter-drier, liquid line solenoid valve, sight glass/moisture indicator, and electronic
expansion valve.
The electrical control center includes a MicroTech II
microprocessor control system and
equipment protection and operating controls necessary for dependable, automatic operation.
The compressor circuits are equipped with individual circuit breakers and a unit disconnect
switch is available as an option over the standard power block.
This software revision adds fixes several bugs in the IP/SI units logic, improves the
operation of remote evaporator units in low ambient air temperatures, improves
communications with the solid state starter and provides compressor electrical data at the
supervisor port for building automation systems.
Nomenclature
W G S 130 - A W
Water-Cooled Condensing
Global
Rotary Screw Compressor
Nominal Capacity (Tons)
W = Water-Cooled Condenser
A = Unit Less Condenser
Design Vintage
Summary of Contents for WGS130AA: WGS140AW
Page 97: ......
