Product Manual PM WSC/WDC 15
WDC Design Features
WDC Dual Compressor Chiller
One WDC Dual Compressor Chiller
= Two Single Compressor
Chillers
1
2
is greater than 2 when it means:
Lower equipment costs than 2 separate units
Lower installation cost than 2 separate units
Lower annual operating cost than either 1 large or 2 small units
Less equipment room space required than for 2 separate units
Capacity reduction to 5% of design cooling tons
Standby redundancy for 80% of the cooling season
The Redundancy Feature
The McQuay Dual Centrifugal Chillers have two of everything connected to a common evaporator and
condenser. Two compressors, two lubrication systems, two control systems, two starters.
Should a failure occur to any component on a compressor system, the component can be removed or repaired
without shutting down the other compressor; an automatic back-up with 60 percent of the chiller design
capacity available.
In the unlikely event of a motor burn-out from a lightening strike or any other cause, the chiller refrigerant
charge will not be contaminated. This is so well proven that it is guaranteed for five years. In areas supported
by McQuayService, should a motor burnout contaminate the refrigerant in the chiller, the charge will be replaced
free for a period of five years from start-up.
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