IM 1059-12 LARGE VERTICAL WSHP 52 www.DaikinApplied.com
Typical hot gas reheat refrigeration
cycle – dual compressors
When the DEHUMID setting is not satised and COOLING has
been satised the reversing valve remains (de-energized) but
the hot gas reheat (HGRH) valve is (energized). This directs
the ow of the refrigerant, a hot gas, from the compressor
through the hot gas reheat (HGRH) coil thus heat is removed
from the refrigerant gas to reheating the cooled air from the
evaporator coil. Then the refrigerant ows 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.
tyPiCal refrigeration CyCles
Figure 41: Hot gas reheat refrigeration cycle
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