Specifications

The New Compressor Technology
Next Generation Centrifugal –
Here Today
Environmental Responsibility
Long Term Refrigerant Solution
The industry’s next generation of centrifugal chillers
is here today with McQuay’s model WMC. The new
technology begins with centrifugal compressors
utilizing frictionless magnetic bearings for oil-free
operation, integral variable-frequency drives, and
high-speed direct drive technology. The high
efficiency compressor is matched with highly
efficient heat exchange vessels to make an
impressive chiller. The control system is based on
McQuay’s MicroTech II® family to provide the
optimum chiller control system. We invite you to
look at the how the features and benefits compare to
older compressor technologies.
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3
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The WMC uses R-134a
refrigerant, which does
not have a phase-out date
and is used to replace
several HCFC refrigerants that have been, or will be,
phased out. R-134a is used in many very efficient
chillers and does not attack the ozone layer.
Ultra Quiet Sound Levels
The WMC is the quietest in the industry for its size
range. The WMC is perfect for sound sensitive
applications, with sound pressure levels as low as 75
dBA at one meter from the unit and 75% load. The
only way to appreciate how quiet these units are is to
hear one operate. It is important to compare the
sound data in this catalog to other offerings.
Remember that a sound pressure difference of only
two to three dBA is
a very noticeable
difference. A
number of owners
have asked for a
large indicating
light on the unit so
they can tell when
it’s on!
Low Operating Costs
Shrink Your Utility Costs with Ultra
Efficient Part-Load Performance
The WMC Integrated Part Load Value (IPLV) is as
low as 0.375 kW/Ton. Compare this with most screw
compressor chillers -
approximately 0.575
kW/Ton. Performance for
reciprocating chillers is less
attractive. There is a
potential for up to 40%
energy savings at part load
compared to other chillers.
Extremely Low Vibration Levels
As a result of the high-speed design, the compressor
vibration levels are extremely low, minimizing
vibration that could be transmitted to the structure.
The unit is shipped with rubber mounting pads and
spring vibration isolators are not required.
Virtually Eliminate Maintenance Costs
With oil removed from the
system, oil samples, oil change-
outs, oil system maintenance, oil
filter changes are eliminated.
The bearing system, shafting
and impellers are shown here.
4 Catalog WMC-4