www.DaikinApplied.com 51 LARGE VERTICAL WSHP IM 1059-12
Typical heating 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 HEATING, the
reversing valve (energized) directs the ow of the
refrigerant, a hot gas, from the compressor to the air-
to-refrigerant heat exchanger coil (condenser). There,
the heat is removed by the air passing over the surfaces
of the coil and the hot gas condenses and becomes a
liquid. The liquid then ows through a thermal expansion
valve to the water-to-refrigerant heat exchanger
(evaporator). The liquid then evaporates and becomes
a gas, at the same time absorbing heat and cooling the
water. 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.
tyPiCal refrigeration CyCles
Figure 40: Heating Refrigeration Cycle
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