Daikin VRV-WIII RWEYQ72PTJU Service Manual page 34

Refrigerant Flow for Each Operation Mode
E. Oil Return Operation at Simultaneous Cooling/Heating Operation
High temp. High pressure gas
High temp. High pressure liquid
Low temp. Low pressure gas
Low temp. Low pressure liquid
26
Indoor Unit ON (Cooling) + Thermo. ON
Heat exchanger
FAN ON
EXP
Filter Filter
(Normal operation)
Branch Selector unit
Filter
EVL EVLS EVH EVHS EVSC
Filter Filter
Condensing Unit
Check valve
SV
Solenoid valve
Check valve
Pressure
regulating
valve
Filter
Indoor Unit ON (Heating) + Thermo. ON
Heat exchanger
FAN OFF
EXP
Filter Filter
(Oil return opening degree)
Filter
EVL EVLS EVH EVHS
Filter Filter
Solenoid valve
SV
Filter
Heat exchanger pipe
Filter
Electronic
expansion valve
Capillary
tube
Four-way valve
Solenoid valve
SV
Check
valve
Check valve
Strainer
Filter
Capillary
tube
Solenoid
Low pressure
valve Gauge port
sensor
1/4" flare connection
Filter
To other condensing unit
Indoor Unit ON (Heating) + Thermo. OFF
Heat exchanger
FAN OFF
EXP
Filter Filter
(Oil return opening degree)
EVSC EVL EVLS EVH
Filter
Filter Filter
Fusible
plug
Electronic
expansion valve
Filter Filter
Water
inlet
SV
Plate heat
Solenoid valve
exchanger
Capillary
tube
Water
Service
outlet
port
Capillary
tube
Four-way valve
Gauge port
S1NPH
High pressure
sensor
S1PH
High pressure
switch
Compressor
INV.
Refrigerant Circuit
SiUS30-1301
Filter
EVHS EVSC
Filter