Refrigerant Flow for Each Operation Mode SiBE31-801_C
79 Refrigerant Circuit
Heating Oil Return & Defrost Operation (at Low Outdoor Temperature)
Indoor unit
Operation switch ON
(Heating)
+
Thermostat ON
Heat exchanger
M
Fan OFF
Filter Filter
Electronic
expansion valve
Operation switch ON
(Heating)
+
Thermostat OFF
Heat exchanger
M
Fan OFF
Filter Filter
Electronic
expansion valve
Operation switch OFF
(Heating)
Heat exchanger
M
Fan OFF
Filter Filter
Electronic
expansion valve
BTSQ20P
Service port
Filter
Gas Pipe
Service port
Filter
Liquid pipe
Solenoid valve
SV
Solenoid
valve
SV
Electronic
expansion valve
Capillary tube
Electronic
expansion
valve
Check valve
Gas Pipe
Filter
Check
valve
Solenoid
valve
Electronic
expansion
valve
Filter
Check valve
SV
Oil separator
Filter
Capillary tube
Pressure
sensor
(high pressure)
High pressure
switch
Compressor
S1NPH
S1PH
INV
Check valve
Solenoid
valve
SV
Check valve
Filter
Liquid pipe
Gas and
liquid
separator
Solenoid
valve
SV
Check
valve
Check
valve
Filter
RTSQ12P
Filter
Filter
Pressure regulating
valve (of check
valve type)
S1NPH
High
pressure
sensor
Subcooling
heat
exchanger
Electronic
expansion valve
Capillary tube
Filter
Electronic expansion
valve
Check valve
Solenoid
valve
SV
Filter
Heat
exchanger
Four way valve
Service
port
Electronic
expansion
valve
Filter
Filter
Four way valve
Capillary
tube
Filter
Gauge
port
Filter
Solenoid
valve
Filter
SV
Solenoid
valve
SV
SV
Solenoid
valve
Check
valve
Strainer
Pressure regulating valve
(of absolute pressure type)
Refrigerator regulator
Filter
Filter
Solenoid
valve
SV
Capillary
tube
High pressure
switch
S1PH
Stop valve
Solenoid valve
SV
Check valve
Filter
High pressure
switch
Filter
Oil separator
S2PH
Check
valve
Filter
Filter
Oil separator
Compressor
INV
Capillary
tube
Capillary
tube
Compressor
STD1
S2NPL
Pressure sensor
(Low pressure)
RTSQ8P
Filter
Strainer
Pressure regulating
valve (of check
valve type)
High
pressure
sensor
S1NPH
Service
port
Filter
Electronic
expansion
valve
Filter
Four way valve
Filter
Capillary
tube
Filter
Subcooling
heat
exchanger
Electronic
expansion valve
Capillary tube
Filter
Four way valve
Electronic expansion
valve
Check valve
Solenoid
valve
SV
Filter
Heat
exchanger
Solenoid
valve
Filter
SV
Solenoid
valve
SV
SV
Solenoid
valve
Check
valve
Filter
Pressure regulating valve
(of absolute pressure type)
Refrigerator regulator
Filter
Filter
Solenoid
valve
SV
Capillary
tube
High pressure
switch
S1PH
Stop valve
Solenoid valve
SV
Pressure sensor
(Low pressure)
S2NPL
Check valve
Oil separator
Filter
Filter
Capillary tube
Compressor
INV
*2 256 pls*2
*2 Oil return/Defrost EV opening
High pressure gas
High pressure liquid
Intermediate pressure gas
Intermediate pressure liquid
Low pressure liquid / gas
Gauge
port