SiUS341615E
Special Control
Functions and Control
68
7.3
Oil Return Operation
In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil that
has flowed out from the compressor to the system side.
Tc : High pressure equivalent saturation temperature
Te : Low pressure equivalent saturation temperature
Ts1: Suction pipe temperature detected by thermistor R3T
7.3.1 Oil Return Operation
in Cooling
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 2 hours after power supply is turned ON and then every 8 hours.)
Furthermore, the cumulative oil feed rate is computed from Tc, Te, and compressor loads.
z
: equipped
–: not equipped
∗
1: RXYQ96/120TA only
Part Name
Electric Symbol
RXYQ72-120TA
RXYQ144/168TA Function of Functional Part
Inverter compressor 1
M1C
z
z
Capacity step PI control
Inverter compressor 2
M2C
—
z
Inverter fan 1
M1F
z
z
TC control
Inverter fan 2
M2F
(
z
)
∗
1
z
Electronic expansion valve (Main)
Y1E
z
z
3,000 pulses
Electronic expansion valve
(Injection)
Y2E
z
z
0 pulse
Four way valve
Y1S
z
z
ON
Solenoid valve (Accumulator oil
return)
Y2S
z
z
ON
Solenoid valve (Oil return 1)
Y3S
z
z
ON
Solenoid valve (Oil return 2)
Y4S
—
z
Ending conditions
&
OR
· A lapse of 3 minutes.
· Ts1–Te < 3˚C (5.4˚F)
· A lapse of 6
minutes while
the frequency is
more than that
of oil return
operation.
Indoor unit actuator
Cooling oil return operation
Fan
Thermostat ON unit
Remote controller setting
Stopping unit
OFF
Thermostat OFF unit
Remote controller setting
Electronic expansion valve
Thermostat ON unit
Normal control
Stopping unit
224 pulses
Thermostat OFF unit
Normal control with forced thermostat
ON
Summary of Contents for RXYQ-TA Series
Page 1: ...Service Manual SiUS341615E RXYQ72 408TAYDU RXYQ72 408TATJU Heat Pump 60 Hz...
Page 321: ...SiUS341615E Wiring Diagrams Appendix 308 RXYQ96 120TAYDU 2D106439A...
Page 322: ...Wiring Diagrams SiUS341615E 309 Appendix RXYQ144 168TAYDU 2D106440A...
Page 323: ...SiUS341615E Wiring Diagrams Appendix 310 RXYQ72TATJU 3D106435A...
Page 324: ...Wiring Diagrams SiUS341615E 311 Appendix RXYQ96 120TATJU 2D106436A...
Page 325: ...SiUS341615E Wiring Diagrams Appendix 312 RXYQ144 168TATJU 2D106437A...
Page 335: ...SiUS341615E Wiring Diagrams Appendix 322 VAM1200GVJU 3D073270C...
Page 336: ...Revision History Month Year Version Revised contents 02 2017 SiUS341615E First edition...
