60 Product Manual PM WSC/WDC
Free Cooling
There are several systems available to achieve “free cooling” when ambient air temperatures are low enough to
reject building heat to the atmosphere without compressor operation. The use of a plate and frame heat
exchanger to exchange heat from the chilled water to the cooling tower water and ultimately to atmosphere is the
most common today.
McQuay chillers are well suited to this application and, as with all chillers, attention must be paid to the system
design, particularly to the switching from the economizer (free cooling) cycle to normal compressor operation.
Vibration Mounting
Every McQuay chiller is run tested and compressor vibration is measured and limited to a maximum rate of 0.14
inches per second which is considerably more stringent than other available compressors. Consequently, floor
mounted spring isolators are not required. Rubber mounting pads are shipped with each unit. It is wise to
continue to use piping flexible connectors to reduce sound transmitted into the pipe and to allow for expansion
and contraction.
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