Specifications

Catalog WSC/WDC-4 9
WDC, Dual Compressor Chillers
One WDC Dual Compressor Chiller
= Two Single Compressor Chillers
Lower equipment costs than two separate chillers
Lower installation cost than two separate chillers
Lower annual operating cost than either one large or two small chillers
Less equipment room space required than for two separate chillers
Capacity reduction to 5% of design cooling tons
Standby redundancy for most of the cooling season
Greatly reduced starting load for emergency standby power plants
Industry Leading Efficiency
When coupled with McQuay's variable frequency drive, the extremely efficient Dual Compressor
Chillers become the most efficient chillers
available in the market place with IPLVs in the low
0.3s kW per ton. IPLV conditions are set by ARI and subject to stringent testing. Insist on ARI
certified IPLV efficiency when making comparisons.
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.
If any component on a compressor system fails, the component can be removed or repaired
without shutting down the other compressor; providing an automatic back-up with at least 60
percent of the chiller design capacity available.
In the unlikely event of a motor burnout, the chiller refrigerant charge will not be contaminated.
This is so well proven that it is guaranteed for five years. Contact the local McQuay sales office
for details. In areas supported by McQuay Factory Service, if a motor burnout contaminates the
refrigerant in the chiller, the charge will be replaced free for a period of five years from start-up.
60 Percent Capacity on One Compressor
When one compressor is running, it is able to utilize the heat transfer area of the entire chiller-
twice the amount found on a single compressor chiller. This huge amount of surface provides
exceptional part load efficiency and lets a single compressor operate at 60 percent of the entire
unit capacity. In most building, this will carry the load most of the time.