Si39-306
Special Control
Function
71
3.2
Oil Return Operation
In order to prevent the running-out of refrigerating machine oil in the compressor, the oil flowing
out from the compressor to the system side is collected through the oil return operation.
3.2.1 Oil Return Operation in Cooling Operation
[Starting conditions]
Start oil return operation in cooling operation referring to the following conditions.
* Cumulative oil return amount
* Timer
Cumulative compressor operating time after power supply turns on exceeds 2 hours and the
time after the completion of previous oil return operation exceeds 8 hours.
Furthermore, the cumulative oil return is calculated according to To, Te, and compressor load.
*
In the case of multi-outdoor-unit system,
Master unit: Performs the operations listed in the table above.
Slave units: Operating units perform the operations listed in the table above.
Non-operating units performs the operations listed in the table above from the oil return operation.
*
Actuators are based on REYQ16M.
Actuator
Oil return preparation
operation
Oil return operation
Post-oil-return operation
Compressor
Upper limit control
124 Hz + ON + OFF
52 Hz + OFF + OFF
Outdoor unit fan
Fan control
Fan control
Fan control
Four way valve 1
OFF
OFF
OFF
Four way valve 2
OFF
OFF
OFF
Main motorized valve (EV1)
1400 pls
1400 pls
1400 pls
Sub motorized valve (EV2)
1400 pls
1400 pls
1400 pls
Sub-cooling motorized valve (EV3)
SH control
0 pls
0 pls
Hot gas bypass valve (SVP)
OFF
ON
ON
Oil equalization valve (SVO)
ON
ON
ON
Receiver gas charging valve (SVL)
OFF
OFF
OFF
Receiver gas discharge valve (SVG)
OFF
OFF
OFF
Discharge pipe stop valve (SVR)
OFF
OFF
OFF
Non-operating unit liquid pipe stop
valve (SVSL)
OFF
OFF
OFF
High pressure gas pipe pressure
reduction valve (SVC)
ON
ON
ON
Ending conditions
1 min.
•
6 min.
•
Ts - Te<5
30 sec.
or
Indoor unit actuator
Cooling oil return operation
Fan
Thermostat ON unit
Set Air Volume
Stopping unit
OFF
Thermostat OFF unit
OFF
Electronic expansion valve
Thermostat ON unit
Normal opening
Stopping unit
200 pls
Thermostat OFF unit
200 pls
Summary of Contents for VRV II REYQ10MY1B
Page 19: ...Model Selection Si39 306 8 General Information ...
Page 150: ...Si39 306 Troubleshooting by Remote Controller Troubleshooting 139 ...
Page 250: ...Si39 306 Piping Diagrams Appendix 239 REYQ14MY1B REYQ16MY1B 4D042070A ...
Page 252: ...Si39 306 Piping Diagrams Appendix 241 1 3 BS Unit BSVQ100MV1 BSVQ160MV1 BSVQ250MV1 4D042115 ...
Page 254: ...Si39 306 Wiring Diagrams for Reference Appendix 243 REYQ14MY1B REYQ16MY1B 3D038572 ...
Page 256: ...Si39 306 Wiring Diagrams for Reference Appendix 245 REYQ18 20 22 24 26 28 30 32MY1B 3D043436 ...
Page 257: ...Wiring Diagrams for Reference Si39 306 246 Appendix REYQ34 36 38 40 42 44 46 48MY1B 3D043437 ...
Page 259: ...Wiring Diagrams for Reference Si39 306 248 Appendix FXCQ40M 50M 80M 125MVE 3D039557A ...
Page 260: ...Si39 306 Wiring Diagrams for Reference Appendix 249 FXZQ20M 25M 32M 40M 50MVE 3D038359 ...
Page 262: ...Si39 306 Wiring Diagrams for Reference Appendix 251 FXKQ25M 32M 40M 63MVE 3D039564A ...
Page 264: ...Si39 306 Wiring Diagrams for Reference Appendix 253 FXMQ40M 50M 63M 80M 100M 125MVE 3D039620A ...
Page 265: ...Wiring Diagrams for Reference Si39 306 254 Appendix FXMQ200M 250MVE 3D039621A ...
Page 266: ...Si39 306 Wiring Diagrams for Reference Appendix 255 FXHQ32M 63M 100MVE 3D039801C ...
Page 267: ...Wiring Diagrams for Reference Si39 306 256 Appendix FXAQ20M 25M 32MVE 40M 50M 63MVE 3D034206A ...
Page 283: ...REFNET Pipe System Si39 306 272 Appendix ...
Page 284: ...Si39 306 Appendix 273 DPSOH RI RQQHFWLRQ 5 7 SH 5 4 0 HDW 5HFRYHU ...
Page 285: ...Si39 306 274 Appendix ...
Page 291: ...Method of Replacing The Inverter s Power Transistors and Diode Modules Si39 306 280 Appendix ...
Page 305: ...Si39 306 iv Index ...