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Special Control
SiUS331708EA
47
Functions and Control
3.2
Oil Return Operation
In order to prevent the compressor from running out of oil, oil return operation is conducted to recover oil that has
flowed out from the compressor to the system side.
3.2.1 Oil Return Operation in Cooling
HTdi : Compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature
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)
Starting conditions
Referring to the set conditions for the following items, start the oil return operation in cooling.
• Cumulative oil feed rate
• Timer setting (Make this setting so as to start the oil return operation when the initial cumulative operating time
reaches two hours after power supply is turned ON and then every eight hours.)
Furthermore, the cumulative oil feed rate is computed from Tc, Te, and compressor loads.
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
Normal control
Control dependent on the
values of Pc and Pe
(
→
Low pressure
protection control)
Normal control from current
rps
Outdoor fan
M1F
M1F
M1F,
M2F
Fan control (Normal
cooling)
Fan control (Normal
cooling)
Fan control (Normal
cooling)
Four way valve
Y1S
Y1S
Y1S
OFF
OFF
OFF
Main electronic
expansion valve
Y1E
Y1E
Y1E
480 pulse (Fully open)
480 pulse (Fully open)
480 pulse (Fully open)
Subcooling
electronic
expansion valve
Y3E
SH control
0 pulse
0 pulse
Hot gas bypass
valve
Y2S
OFF
OFF
OFF
Injection valve
Y3S
Y3S
OFF
OFF
OFF
Ending conditions
15 seconds
•
3 minutes
•
Ts1–Te < 3°C
(5.4°F)
•
A lapse of 20
minutes
•
System rps is
large than oil
return rps for
more than 6
minutes.
•
3 minutes
•
Pe < 0.6 MPa (87 psi)
•
HTdi > 1
10°C (230°F)
•
Pc > 3.6 MPa (522 psi)
&
OR
OR
Indoor unit actuator
Cooling oil return operation
Indoor fan
Thermostat ON unit
Remote controller setting
Non-operating unit
OFF
Thermostat OFF unit
Remote controller setting
Electronic expansion valve
Thermostat ON unit
Normal opening
Non-operating unit
224 pulse
Thermostat OFF unit
Normal opening with forced thermostat ON
Содержание RXSQ24TAVJU
Страница 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Страница 289: ...SiUS331708EA Wiring Diagrams Appendix 276 1 Wiring Diagrams 1 1 Outdoor Unit RXSQ24 36TAVJU 3D109545A...
Страница 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
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