SiUS39-602
Special Control
Function
51
3.2.2 Oil Return Operation in Heating Operation
[Starting conditions]
Start oil return operation in heating operation referring to the following conditions.
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. And cumulative oil
return is calculated based on Tc, Te compressor load.
<In condition of oil return operation>
Compressor cumulative operation time > 8 hours
(However, 2 hours after turning power on first time.)
Actuator
Oil return preparation
operation
Oil return operation
Post-oil-return operation
Compressor
Upper limit control
124 Hz + ON
1-step increase from
(74Hz + OFF) to
(Pc - Pe > 0.4 MPa) time.
Outdoor unit fan
STEP7
or
STEP8
OFF
STEP8
Four way valve 1
Depend on previous heat
exchange mode
OFF
ON
Four way valve 2
Depend on previous heat
exchange mode
OFF
OFF
Main motorized valve (EV1)
Four way valve 1
OFF:1400 pls
ON:SH control
1400 pls
180 pls
Sub motorized valve (EV2)
Four way valve 2
OFF:1400 pls
ON:SH control
1400 pls
1400 pls
Sub-cooling motorized valve (EV3)
0 pls
0 pls
0 pls
Hot gas bypass (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 gas stop valve (SVR)
ON
OFF
OFF
Non-operating unit liquid pipe stop
valve (SVSL)
ON
OFF
OFF
High pressure gas pipe pressure
reduction valve (SVC)
OFF
ON
ON
Ending conditions
2 min.
•
6 min.
•
Ts - Te<9
•
160 sec.
•
Pc - Pe>58 psi
or
or
Indoor unit actuator
Heating oil return operation
Fan
Cooling Thermostat ON unit
Set Fan Speed
Heating Thermostat ON unit
OFF
Stopping unit
OFF
Thermostat OFF unit
OFF
Electronic expansion valve
Thermostat ON unit
512 pls
Stopping unit
512 pls
Thermostat OFF unit
512 pls
Summary of Contents for REYQ72
Page 35: ...Specifications SiUS39 602 24 Specifications...
Page 121: ...Field Setting SiUS39 602 110 Test Operation...
Page 129: ...Troubleshooting by Remote Controller SiUS39 602 118 Troubleshooting...
Page 225: ...Troubleshooting OP Unified ON OFF Controller SiUS39 602 214 Troubleshooting...
Page 232: ...SiUS39 602 Piping Diagrams Appendix 221 1 3 BS Unit BSVQ36MVJU BSVQ60MVJU 4D045338...
Page 235: ...Wiring Diagrams for Reference SiUS39 602 224 Appendix REYQ144 168 192MTJU C 3D050354A...
Page 240: ...SiUS39 602 Wiring Diagrams for Reference Appendix 229 2 4 BS Unit BSVQ36M 60MVJU 3D045069A...
Page 249: ...Example of Connection R 410A Type SiUS39 602 238 Appendix...
Page 255: ...Method of Replacing The Inverter s Power Transistors and Diode Modules SiUS39 602 244 Appendix...
Page 265: ...Precautions for New Refrigerant R 410A SiUS39 602 254 Precautions for New Refrigerant R 410A...
Page 269: ...SiUS39 602 iv Index...