Daikin GYEQ20AN Service Manual page 31

SiAUY361411EA
5.1.4 Heating operation
• High-temperature, high-pressure refrigerant gas compressed by the compressor is fed to the
• The outdoor electronic expansion valve depressurize the liquid refrigerant to facilitate
• It is outdoor heat exchanger F/B that function as the evaporator, which deprives the air of
• The refrigerant that has passed through outdoor heat exchanger F/B is fed to the waste heat
SV3F
SV3E
SV3A SV3B EV3A SV3C SV3D
PH1
↓
Oil
separator
TO3
Oil
cooler
CV1 HPS1
TD1
TO1
Compressor 1
HPS2
TD2 CV2
Flexible
tube 4
Compressor 2 TO2
Device Overview
indoor heat exchanger, which in turn condenses the refrigerant gas and heats the indoor air
by radiating the condensation heat; this is where the refrigerant changes from gas to liquid.
refrigerant evaporation in outdoor heat exchanger F/B and the waste heat recovery device.
evaporation heat by changing the refrigerant from liquid to gas.
Also, the refrigerant that has passed through the waste heat recovery device completely
evaporates and deprives the gas engine cooling water of heat.
recovery device, which in turn completely evaporates the refrigerant by mixing it with high-
temperature, high-pressure refrigerant and then returns it to the compressor. This completes
one heating cycle.
Outdoor heat exchanger F
Outdoor heat exchanger B
SV32
SV31
CV6
EV3B
TS1
EV3
CV7
SV1
→
→
SV9
SV7
TO4
PH2
TS2
SV3
Flexible
Accumulator
tube 3
TS5
PH3 SV4
SV6
PH4
SV3H
EV1
CV3B
Receiver
SC
Heat
exchanger
EV2 CV3C
SV3G
CV3A
CV32
SV12
SV37
EV6 CV3 CV5
EV4
CV34 CV4
PL1
EV5
TS3
CV13 SV13
Waste heat
recovery
device
System Diagrams
BS unit
BV3
BV2
BV1
⇔
BS unit
TREC31
SV : Solenoid valves
EV : Electronic expansion valve
TD : Discharge temperature
TS : Intake temperature
TO : Oil temperature
EV7
TREC : Receiver temperature
Indoor unit
Indoor unit
CV : Check valve
BV : Stop valve
HPS : Hi g h-si d e pressure swi t ch
PH : High pressure sensor
PL : Low pressure sensor
20