SiME341909EA
Special Control
Part 4 Functions and Control
69
7.2 Oil Return Control
In order to prevent the compressor from running out of oil, the oil return control 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
Ts: Suction pipe temperature detected by thermistor R3T
Starting Conditions
Oil return control is not conducted before 2 hours have elapsed from the activation of power
supply.
After 2 hours have elapsed, oil return control starts when the following item meets the
reference value.
Total amount of oil discharged from the compressor
(The total amount of oil discharged from the compressor is computed from Tc, Te, and
compressor loads.)
Oil return control starts every 8 hours of cumulative operation of the compressor, even if the
reference value is not met.
Part Name
Electric
Symbol
RXQ6/8AR
RXQ10/12AR
RXQ14/16AR
Function of Functional Part
Compressor 1
M1C
Capacity step PI control
Compressor 2
M2C
—
—
Inverter fan 1
M1F
TC control
Inverter fan 2
M2F
—
Electronic expansion valve
(Injection)
Y2E
0 pulse
Electronic expansion valve
(Refrigerant auto charge)
Y4E
480 pulse
Solenoid valve (Oil return 1)
Y3S
ON
Solenoid valve (Oil return 2)
Y4S
—
—
Ending conditions
&
OR
· A lapse of 3 minutes.
· Ts1–Te < 3°C
· A lapse of 6 minutes
while the frequency
is more than that of
oil return control.
Indoor unit actuator
Cooling oil return control
Fan
Thermostat ON unit
Remote controller setting
Non-operating unit
OFF
Thermostat OFF unit
Remote controller setting
Electronic expansion valve
Thermostat ON unit
Normal control
Non-operating unit
224 pulse
Thermostat OFF unit
Normal control with forced thermostat
ON
Summary of Contents for VRV X RXQ10ARYFK
Page 1: ...Service Manual Cooling Only 50 60 Hz RXQ6 48A N R Series SiME341909EA...
Page 289: ...SiME341909EA Wiring Diagrams Part 7 Appendix 283 RXQ10 12ARYFK 2D124184...
Page 290: ...Wiring Diagrams SiME341909EA 284 Part 7 Appendix RXQ14 16ARYFK 2D124183...
Page 295: ...SiME341909EA Wiring Diagrams Part 7 Appendix 289 FXMQ40 50 63 80 100ARV1 3D127112 04 59...