SiUS371901E
Refrigerant Circuit
Refrigerant Circuit
62
1. Refrigerant Circuit
1.1
Outdoor Unit
No. in
piping
diagram
Electric
symbol
Name
Function
(1)
M1C
Compressor
Compressor is operated on frequencies between 15 rps to 140 rps by using the inverter.
Refer to page 112, 113.
(2)
M1F
M2F
Inverter fan
The fan rotation speed is varied in 53 steps by using inverter. Refer to page 115.
(3)
Y1E
Electronic expansion valve
(Heat exchanger upper)
While in heating, PI control is applied to keep the outlet superheating degree of air heat
exchanger constant.
(4)
Y2E
Electronic expansion valve
(Subcooling heat exchanger)
PI control is applied to keep the outlet superheating degree of subcooling heat exchanger
constant.
(5)
Y3E
Electronic expansion valve
(Heat exchanger lower)
While in heating, PI control is applied to keep the outlet superheating degree of air heat
exchanger constant.
(6)
Y4E
Electronic expansion valve
(Subcooling injection)
Used to control compressor injection.
(7)
Y5E
Electronic expansion valve
(Refrigerant cooling)
Used to control the refrigerant amount to cool the diode bridge and power module of the
inverter PCB.
(8)
Y7E
Electronic expansion valve
(Receiver gas purge)
Used to collect the refrigerant to receiver.
(9)
Y1S
Solenoid valve (Oil separator
oil return)
Used to return oil from the oil separator to the compressor.
(10)
Y2S
Solenoid valve
(Hot gas bypass)
Used to flow discharge gas to the compressor inlet.
(11)
Y3S
Solenoid valve (Liquid shutoff) Used to shut off liquid refrigerant flow to the receiver.
(12)
Y4S
Four way valve
(HP/LP gas pipe)
Used to switch dual pressure gas pipe to high pressure or low pressure.
(13)
Y5S
Four way valve
(Heat exchanger lower)
Used to switch outdoor heat exchanger to evaporator or condenser.
(14)
Y6S
Four way valve
(Heat exchanger upper)
(15)
Y7S
Solenoid valve
(Accumulator oil return)
Used to return oil from the accumulator to the compressor.
(16)
S1NPH High pressure sensor
Used to detect the high pressure.
(17)
S1NPL
Low pressure sensor
Used to detect the low pressure.
(18)
S1PH
High pressure switch
This functions when pressure increases to stop operation and avoid high pressure
increase in the fault operation.
(19)
—
Pressure regulating valve
(Liquid pipe)
This is used when pressure increases, to prevent any damage on components caused by
pressure increase in transport or storage.
(20)
—
Subcooling heat exchanger
Apply subcooling to liquid refrigerant.
(21)
—
Capillary tube
Used to return the refrigerating oil separated through the oil separator to the compressor.
(22)
R1T
Thermistor (Outdoor air)
Used to detect outdoor air temperature, correct discharge pipe temperature and for other
purposes.
(23)
R21T
Thermistor (M1C discharge)
Used to detect discharge pipe temperature.
(24)
R3T
Thermistor (Receiver inlet)
Used to detect liquid pipe temperature of receiver inlet.
(25)
R4T
Thermistor (Heat exchanger
liquid upper)
This detects temperature of liquid pipe for air heat exchanger.
(26)
R5T
Thermistor (Heat exchanger
liquid lower)
(27)
R6T
Thermistor (Subcooling gas)
This detects temperature of gas pipe for subcooling heat exchanger.
(28)
R7T
Thermistor (Subcooling liquid) This detects temperature of liquid pipe for subcooling heat exchanger.
(29)
R8T
Thermistor (Heat exchanger
gas upper)
This detects temperature of gas pipe for air heat exchanger.
(30)
R9T
Thermistor (Heat exchanger
gas lower)
(31)
R10T
Thermistor (Suction pipe)
Used to detect suction pipe temperature.
(32)
R11T
Thermistor (Deicer)
Used to detect liquid pipe temperature of air heat exchanger. Used to make judgements
on defrost operation.
(33)
R12T
Thermistor (Compressor
suction)
Used to detect suction pipe temperature of compressor.
(34)
R13T
Thermistor
(Receiver gas purge)
Used to detect gas pipe temperature of receiver gas purge piping.
(35)
R14T
Thermistor (M1C body)
Detects compressor surface temperature, this switch is activated at surface temperature
of 120°C (248°F) or more to stop the compressor.
(36)
R16T
Thermistor
(Subcooling injection)
Used to control subcooling injection.
Summary of Contents for REYQ-XA
Page 1: ...Service Manual SiUS371901E REYQ72 456XATJU REYQ72 456XAYDU REYQ72 432XAYCU Heat Recovery 60 Hz...
Page 415: ...SiUS371901E Wiring Diagrams Appendix 402 REYQ144 168XATJU 2D119206A...
Page 416: ...Wiring Diagrams SiUS371901E 403 Appendix REYQ72 96 120XAYDU 2D119207B...
Page 417: ...SiUS371901E Wiring Diagrams Appendix 404 REYQ144 168XAYDU 2D119208B...
Page 418: ...Wiring Diagrams SiUS371901E 405 Appendix REYQ72 96 120 144 168XAYCU 2D119209A...
Page 421: ...SiUS371901E Wiring Diagrams Appendix 408 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 423: ...SiUS371901E Wiring Diagrams Appendix 410 FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 425: ...SiUS371901E Wiring Diagrams Appendix 412 FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU C 3D110467C...
Page 426: ...Wiring Diagrams SiUS371901E 413 Appendix FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 428: ...Wiring Diagrams SiUS371901E 415 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 429: ...SiUS371901E Wiring Diagrams Appendix 416 FXAQ07 09 12 18 24PVJU C 3D075354D...
Page 435: ...SiUS371901E Wiring Diagrams Appendix 422 VAM1200GVJU 3D073270D...
Page 437: ...SiUS371901E Wiring Diagrams Appendix 424 1 4 2 Multi Branch Selector Unit BS4Q54TVJ 3D089123B...
Page 438: ...Wiring Diagrams SiUS371901E 425 Appendix BS6 8Q54TVJ 2D089122B...
Page 439: ...SiUS371901E Wiring Diagrams Appendix 426 BS10 12Q54TVJ 2D089121B...
Page 440: ...Revision History Month Year Version Revised contents 04 2019 SiUS371901E First edition...
