Typical Refrigeration Cycles - Daikin Enfinity VFC Installation And Maintenance Manual

Figure 35: Cooling Mode
Refrigerant
Exchanger
Cooling Refrigeration Cycle
When the wall thermostat is calling for COOLING, the reversing valve directs the flow of the refrigerant, a hot gas,
leaving the compressor, to the water-to-refrigerant heat exchanger. Here the heat is removed by the water and the
hot gas condenses to become a liquid. The liquid then flows through a thermal expansion metering system to the
air-to-refrigerant heat exchanger coil. The liquid then evaporates becoming a gas, at the same time absorbing heat
and cooling the air passing over the surfaces of the coil. The refrigerant then flows as a low pressure gas through the
reversing valve and back to the suction side of the compressor to complete the cycle.
Figure 36: Heating Mode
Refrigerant
Exchanger
Heating Refrigeration Cycle
When the wall thermostat is calling for HEATING, the reversing valve directs the flow of the refrigerant, a hot gas,
leaving the compressor, to the air-to-refrigerant heat exchanger coil. Here the heat is removed by the air passing
over the surfaces of the coil and the hot gas condenses to become a liquid. The liquid then flows through a capillary
thermal expansion metering system to the water-to-refrigerant heat exchanger. The liquid then evaporates becoming a
gas, at the same time absorbing heat and cooling the water. The refrigerant then flows as a low pressure gas through
the reversing valve and back to the suction side of the compressor to complete the cycle.
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Return Air
Coil –
Air to
Heat
Blower
Conditioned Air
(Cooling)
Return Air
Coil –
Air to
Heat
Blower
Conditioned Air
(Heating)
Thermal
Coaxial Heat
Expansion Valve
Exchanger
Water In
Water Out
Reversing Valve
Thermal
Coaxial Heat
Expansion Valve
Exchanger
Water In
Water Out
Sensing Bulb
and
Capillary Tube
Compressor
Reversing Valve
37 Enfinity Vertical Water Source Heat Pumps • IM 930-6
t r
yPiCal efrigeration
Sensing Bulb
and
Capillary Tube
Compressor
C
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