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Basic Control
SiUS331708EA
41
Functions and Control
2. Basic Control
2.1
Normal Operation
Cooling Operation
Heating Operation
+
Heating operation is not functional at an outdoor air temperature of 24
°
CDB (75
°
FDB) or more.
Outdoor unit actuator
Electric symbol
Operation
Remarks
24/36 class
48 class
60 class
Compressor
M1C
M1C
M1C
Compressor PI control
Used for high pressure protection control,
low pressure protection control, discharge
pipe temperature protection control, and
compressor operating frequency upper
limit control with inverter protection
control.
Outdoor fan
M1F
M1F
M1F, M2F Cooling fan control
Four way valve
Y1S
Y1S
Y1S
OFF
Main electronic
expansion valve
Y1E
Y1E
Y1E
480 pulse (Fully open)
Subcooling electronic
expansion valve
Y3E
PI control
Hot gas bypass valve
Y2S
OFF
This valve turns on with low pressure
protection control.
Injection valve
Y3S
Y3S
OFF
This valve turns on with high discharge
temperature protection control.
Outdoor unit actuator
Electric symbol
Operation
Remarks
24/36 class
48 class
60 class
Compressor
M1C
M1C
M1C
Compressor PI control
Used for high pressure protection control,
low pressure protection control, discharge
pipe temperature protection control, and
compressor operating frequency upper
limit control with inverter protection
control.
Outdoor fan
M1F
M1F
M1F, M2F STEP 7 or 8
Four way valve
Y1S
Y1S
Y1S
ON
Main electronic
expansion valve
Y1E
Y1E
Y1E
PI control
Subcooling electronic
expansion valve
Y3E
PI control
Hot gas bypass valve
Y2S
OFF
This valve turns on with low pressure
protection control.
Injection valve
Y3S
Y3S
OFF
This valve turns on with high discharge
temperature protection control.
Summary of Contents for RXSQ24TAVJU
Page 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Page 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
Page 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Page 295: ...SiUS331708EA Wiring Diagrams Appendix 282 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 298: ...Wiring Diagrams SiUS331708EA 285 Appendix FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 300: ...Wiring Diagrams SiUS331708EA 287 Appendix FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU 3D110467B...
Page 301: ...SiUS331708EA Wiring Diagrams Appendix 288 FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 302: ...Wiring Diagrams SiUS331708EA 289 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 303: ...SiUS331708EA Wiring Diagrams Appendix 290 FXAQ07 09 12 18 24PVJU 3D075354C...
Page 309: ...SiUS331708EA Wiring Diagrams Appendix 296 VAM1200GVJU 3D073270D...