Si34-601A
Special Control
Function
111
3.3
Oil Return Operation
In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil flown out
from the compressor to the system side.
3.3.1 Oil Return Operation in Cooling Operation
[Start 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.
*
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 perform the operations listed in the table above from the oil return operation.
(Non-operating unit stops during “oil return preparation operation”.)
*
Actuators are based on RXYQ14~18P.
Outdoor unit actuator
Oil return preparation
operation
Oil return operation
Post-oil-return operation
Compressor
Take the current step as the
upper limit.
5 HP: 52 Hz
(
→
Low pressure constant
control)
Other model:
52 Hz + ON + ON
(
→
Low pressure
constant control)
↓
Maintain number of
compressors in oil
return preparation
operation ON
Same as the
“
oil return
operation
”
mode.
Outdoor unit fan
Fan control (Normal cooling) Fan control (Normal cooling) Fan control (Normal cooling)
Four way valve
OFF
OFF
OFF
Main motorized valve (EV1)
480 pls
480 pls
480 pls
Subcooling motorized valve (EV2)
SH control
0 pls
0 pls
Hot gas bypass valve (SVP)
OFF
OFF
OFF
Accumulator oil return valve (SVO)
ON
ON
ON
Ending conditions
20 sec.
•
3 min.
•
Ts - Te<5
°
C
•
3 min.
•
Pe<0.6MPa
•
HTdi>110
°
C
or
or
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 opening
Stopping unit
224 pls
Thermostat OFF unit
Normal opening with forced thermostat ON
Summary of Contents for VRV III RXYQ5-54PY1
Page 1: ...RXYQ5 54PY1 R 410A Heat Pump 50Hz Si34 601A...
Page 101: ...Refrigerant Flow for Each Operation Mode Si34 601A 90 Refirgerant Circuit...
Page 153: ...Outline of Control Indoor Unit Si34 601A 142 Function...
Page 219: ...Troubleshooting by Remote Controller Si34 601A 208 Troubleshooting...
Page 226: ...Si34 601A Troubleshooting by Remote Controller Troubleshooting 215...
Page 325: ...Troubleshooting OP Unified ON OFF Controller Si34 601A 314 Troubleshooting...
Page 327: ...Piping Diagrams Si34 601A 316 Appendix 1 Piping Diagrams 1 1 Outdoor Unit RXYQ5PY1 3D050782...
Page 328: ...Si34 601A Piping Diagrams Appendix 317 RXYQ8P 3D050783...
Page 329: ...Piping Diagrams Si34 601A 318 Appendix RXYQ10P 12PY1 3D050784...
Page 330: ...Si34 601A Piping Diagrams Appendix 319 RXYQ14P 16P 18PY1 3D050785...
Page 336: ...Si34 601A Wiring Diagrams for Reference Appendix 325 RXYQ8PY1 3D050454J...
Page 337: ...Wiring Diagrams for Reference Si34 601A 326 Appendix RXYQ10PY1 3D050455H...
Page 338: ...Si34 601A Wiring Diagrams for Reference Appendix 327 RXYQ12PY1 3D051890G...
Page 339: ...Wiring Diagrams for Reference Si34 601A 328 Appendix RXYQ14P 16P 18PY1 3D050456H...
Page 344: ...Si34 601A Wiring Diagrams for Reference Appendix 333 FXCQ40M 50M 80M 125MVE 3D039557A...
Page 346: ...Si34 601A Wiring Diagrams for Reference Appendix 335 FXZQ20M 25M 32M 40M 50M7V1B 3D038359...
Page 347: ...Wiring Diagrams for Reference Si34 601A 336 Appendix FXKQ25MA 32MA 40MA 63MAVE 3D039564C...
Page 352: ...Si34 601A Wiring Diagrams for Reference Appendix 341 FXMQ200MA 250MAVE 3D039621B...
Page 353: ...Wiring Diagrams for Reference Si34 601A 342 Appendix FXHQ32MA 63MA 100MAVE 3D039801D...
Page 356: ...Si34 601A Wiring Diagrams for Reference Appendix 345 FXUQ71MA 100MA 125MAV1 3D044973A...
Page 357: ...Wiring Diagrams for Reference Si34 601A 346 Appendix FXMQ125MF 200MF 250MFV1 3D044996C...
Page 358: ...Si34 601A Wiring Diagrams for Reference Appendix 347 BEVQ71MA 100MA 125MAVE 3D044901B...
Page 381: ...Method of Checking The Inverter s Power Transistors and Diode Modules Si34 601A 370 Appendix...
Page 395: ...Si34 601A iv Index...
