Specifications
IMM WMC-2 Centrifugal Chillers 3
Introduction
General Description
The McQuay Model WMC Centrifugal Water Chillers are complete, self-contained, automatically controlled,
fluid-chilling units featuring oil-free, magnetic bearing compressors. Each unit is completely assembled and
factory tested before shipment.
The WMC chillers are equipped with two compressors operating in parallel with a single evaporator and single
condenser. The model WMC 145S has a single compressor.
The chillers use refrigerant R-134a that operates at a positive pressure over the entire operation range, so no
purge system is required.
The controls are pre-wired, adjusted and tested. Only normal field connections such as water piping, relief valve
piping, electric power and control interlocks are required, thereby simplifying installation and increasing
reliability. Necessary equipment protection and operating controls are included.
All McQuay centrifugal chillers are factory-tested prior to shipment and must be commissioned by a factory-
trained McQuay service technician. Failure to follow this startup procedure can affect the equipment warranty.
The standard limited warranty on this equipment covers parts that prove defective in material or workmanship.
Specific details of this warranty can be found in the warranty statement furnished with the equipment.
Cooling towers used with McQuay centrifugal chillers are normally selected for condenser water inlet water
temperatures between 75°F and 90°F (24°C and 32°C). Lower entering water temperatures are desirable from
the standpoint of energy reduction, but a minimum does exist. For recommendations on optimum entering water
temperature and cooling tower fan control, consult the “Condenser Water” section on page 7.
Nomenclature
W M C 290 D
H
AZARD
I
DENTIFICATION
I
NFORMATION
!
DANGER
Dangers indicate a hazardous situation which will result in death or serious injury if not
avoided.
!
WARNING
Warnings indicate potentially hazardous situations, which can result in property damage,
severe personal injury, or death if not avoided.
!
CAUTION
Cautions indicate potentially hazardous situations, which can result in personal injury or
equipment damage if not avoided.
Water-cooled
Magnetic Bearings
Centrifugal Compressor
D=Dual Compressors
S=Single Compressor
Nominal Tons