Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 50

Refrigerant Flow for Each Operation Mode
Cooling oil return / Heating oil return / Defrost operation
"High temperature, high pressure gas"
"High temperature, high pressure liquid"
"Low temperature, low pressure"
PRESSURE SENSOR
(HIGH, LIQUID PIPE)
S2NPH
FILTER
STRAINER PRESSURE REGULATING VALVE
SOLENOID
VALVE
CHECK
VALVE
LIQUID PIPE
LIQUID PIPE
STOP VALVE
(WITH SERVICE
PORT φ7.9mm
FLARE
CONNECTION)
FILTER
STOP VALVE
GAS PIPE
(WITH SERVICE
PORT φ7.9mm
FLARE
CONNECTION)
40
Indoor unit operation "ON" (Cooling) Indoor unit operation "OFF" (Cooling)
+
Thermostat "ON"
Heat exchanger
Fan "ON"
Electronic expansion valve
(Superheated control)
Filter Filter
CHECK
VALVE FILTER
FILTER SV
CHECK
SOLENOID
SOLENOID
FUSIBLE VALVE
VALVE
VALVE
PLUG
SOLENOID
VALVE
CHECK
VALVE
CHECK
SOLENOID
SV
VALVE
VALVE
HIGH PRESSURE
SWITCH
(CONTROL) PIPE HEAT
EXCHANGER
S4PH
SOLENOID
VALVE
SV
CHECK
SOLENOID VALVE
VALVE
SV
MIXING
UNIT
PRESSURE
SENSOR
(LOW)
Indoor unit operation "ON" (Cooling)
Heat exchanger
Fan "OFF"
Electronic expansion valve
(224 pls)
Filter Filter
SOLENOID
VALVE
STRAINER
SV
SOLENOID
RECEI V ER
STRAINER
VALVE SV
FUSIBLE
PLUG
FILTER
SOLENOID
PIPE HEAT CHECK VALVE
PIPE HEAT SV
VALVE
EXCHANGER
EXCHANGER
CHECK VALVE
ELECTRONIC
PRESSURE REGULATI N G VALVE
EXPANSION VALVE
(ABSOLUTE PRESSURE TYPE)
DOUBLE PIPE
HEAT EXCHANGER
CAPILLARY
FOUR WAY VALVE
TUBE
SOLENOID
VALVE
HIGH PRESSURE
SWITCH
SOLENOID
VALVE
SERVICE
PORT
FILTER
CAPILLARY
TUBE
+
Thermostat "OFF"
Heat exchanger
Fan "ON"
Electronic expansion valve
(224 pls)
Filter Filter
ELECTRONIC
EXPANSION VALVE
FILTER
FILTER
ELECTRONIC
EXPANSION VALVE
FAN
M
FAN
M
HIGH PRESSURE
SENSOR
CHECK VALVE CHECK VALVE CHECK VALVE
FILTER FILTER
FILTER
HIGH PRESSURE
SWITCH
S1PH S2PH
FILTER FILTER FILTER
COMPRESSOR COMPRESSOR COMPRESSOR
INV CAPILLARY STD2
STD1 CAPILLARY
TUBE
TUBE
Refrigerant Circuit
SiBE341027
HEAT EXCHANGER
HIGH PRESSURE
SWITCH
S3PH