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SiUS331708EA
Special Control
Functions and Control
48
3.2.2 Oil Return Operation in Heating
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Tc : High pressure equivalent saturation temperature
Te : Low pressure equivalent saturation temperature
Ts1 : Suction pipe temperature detected by thermistor R3T (suction pipe 1)
Tb : Heat exchanger temperature
Starting conditions
Referring to the set conditions for the following items, start oil return operation in heating.
•
Integrated amount of displaced oil
•
Timer setting (After the power is turned ON, integrated operating time is two hours and subsequently every
eight hours.)
In addition, integrated amount of displaced oil is derived from Tc, Te, and compressor load.
∗
From the preparing oil-returning operation to the oil-returning operation, and from the oil-returning operation
to the operation after oil-returning, the compressor stops for 1 minute to reduce noise on changing of the four
way valve.
Outdoor unit
actuator
Electric symbol
Oil return preparation
operation
Oil return operation
After oil return operation
24/36 class 48 class 60 class
Compressor
M1C
M1C
M1C
Upper limit control
→
0 rps
STEP 25 load (24/36 class)
STEP 21 load (48/60 class)
Increases 2 steps every 20
seconds from minimum
frequency until Pc – Pe >
0.4 MPa (58 psi) is achieved.
Outdoor fan
M1F
M1F
M1F,
M2F
Fan control
(Normal heating)
Control dependent on the
values of Pc from STEP 3
OFF
→
STEP 8 after
Pc – Pe > 0.4 MPa (58 psi)
Four way valve
Y1S
Y1S
Y1S
ON
OFF
ON
Main electronic
expansion valve
Y1E
Y1E
Y1E
SH control
→
0 pulse
480 pulse (Fully open)
55 pulse
Subcooling
electronic
expansion valve
Y3E
Normal control
→
0 pulse
0 pulse
0 pulse
Hot gas bypass
valve
Y2S
OFF
(Up to 5 minutes 50
seconds)
OFF
ON
→
OFF
Injection valve
Y3S
Y3S
OFF
OFF
OFF
Ending conditions
•
More than 4 minutes
30 seconds
•
A lapse of 20 seconds
from four way valve
ON
→
OFF
•
16 minutes
•
Tb > 11°C (51.8°F)
•
Ts1 – Te < 5°C (9°F)
•
160 seconds
•
Pc > 2.7 MPa (391 psi)
•
Pc – Pe > 0.4 MPa
(58 psi)
OR
OR
OR
&
Indoor unit actuator
Heating oil return operation
Indoor fan
Thermostat ON unit
OFF
Non-operating unit
OFF
Thermostat OFF unit
OFF
Electronic expansion valve
Thermostat ON unit
416 pulse
Non-operating unit
256 pulse
Thermostat OFF unit
416 pulse
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...