Daikin GYEQ20AN Service Manual page 27

SiAUY361411EA
5.1.2 Cooling Main / Heating Main A Mode Operation
• High-temperature, high-pressure refrigerant gas compressed by the compressor is fed to
• The indoor electronic expansion valve on the cooling side depressurizes the liquid refrigerant
• It is the indoor heat exchanger on the cooling side that functions as the evaporator, which
• The refrigerant that has passed through the indoor heat exchanger on the cooling side is fed
GYEQ20AN
Oil separator
Compressor 1
Compressor 2
∗ The actuators and refrigerant flow may vary depending on the control.
Device Overview
outdoor heat exchanger F and the indoor heat exchanger on the heating side, which in turn
condense the refrigerant gas while radiating the condensation heat into the air. The indoor
unit on the heating side warms the indoor air through this heat radiation. This is where the
refrigerant changes from gas to liquid.
to facilitate refrigerant evaporation in the evaporator.
deprives the indoor air of evaporation heat by changing the refrigerant from liquid to gas. The
indoor air is cooled through this evaporation heat deprivation process.
to the outdoor unit, which in turn completely evaporates the refrigerant by mixing it with high-
temperature, high-pressure refrigerant in the waste heat recovery device and then returns it to
the compressor. This completes one cooling/heating cycle.
Outdoor heat exchanger F Outdoor fan
Outdoor heat exchanger B
Oil
cooler
Accumulator
(Discharge gas)
(Intake gas)
(Liquid)
Receiver
Waste heat
recovery
device
System Diagrams
BS unit
Heating indoor unit
BS unit
Cooling 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
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