IM 1059-12 LARGE VERTICAL WSHP 50 www.DaikinApplied.com
Typical cooling refrigeration cycle – dual
compressors
Note: Typical temperature readings are at full load con-
ditions at ISO-13256 for boiler-tower applications.
When the wall thermostat calls for COOLING, the
reversing valve (de-energized) directs the ow of the
refrigerant, a hot gas, from the compressor to the water-
to-refrigerant heat exchanger (coaxial heat exchanger).
There, the heat is removed by the water, and the hot
gas condenses to become a liquid. The liquid then
ows through a thermal expansion valve to the air-to-
refrigerant heat exchanger coil (evaporator). The liquid
then evaporates and becomes a gas, at the same time
absorbing heat and cooling the air passing over the
surfaces of the coil. The refrigerant then ows as a low
pressure gas through the reversing valve and back to the
suction side of the compressor to complete the cycle.
Figure 39: Cooling refrigeration cycle
tyPiCal refrigeration CyCles
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