Daikin GYEQ20AN Service Manual page 32

System Diagrams
5.1.5 Defrosting Operation
• High-temperature, high-pressure gas compressed by the compressor is fed via the solenoid
• The partially liquefied refrigerant that has passed through the outdoor heat exchanger is fed
GYEQ20AN
Oil separator
Compressor 1
Compressor 2
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valve to the outdoor heat exchanger, which in turn condenses the gas while radiating the
condensation heat into the outdoor air. This condensation heat is used to melt frost formed on
the outdoor heat exchanger.
via the receiver to the waste heat recovery device, where it completely evaporates and
deprives the gas engine cooling water (hot water) of heat before returning to the compressor.
The engine's waste heat is used as the heat source for heating operation.
Outdoor heat exchanger F Outdoor fan
Outdoor heat exchanger B
Oil
cooler
Accumulator
(Discharge gas)
(Intake gas)
(Liquid)
Receiver
Waste heat
recovery
device
SiAUY361411EA
BS unit
Indoor unit
BS unit
Indoor unit
SV : Solenoid valves CV : Check valve
EV : Electronic expansion valve BV : Stop valve
TD : Discharge temperature HPS : Hi g h-si d e pressure swi t ch
TS : Intake temperature PH : High pressure sensor
TO : Oil temperature PL : Low pressure sensor
TREC : Receiver temperature
Device Overview