SiBE341001
Detailed Control Functions
Function
52
2.7
Special Control
2.7.1 Pump-down Residual Operation
If the liquid refrigerant stays in the evaporator at the startup of a compressor, this liquid refrigerant enters the
compressor, thus resulting in diluted oil in the compressor and then degraded lubrication performance.
Consequently, in order to recover the refrigerant in the evaporator while the compressor stops, the pump-down residual
operation is conducted.
Part Name
Electric
Symbol
Normal Cooling
Normal Simultaneous Cooling / Heating
Master Unit
Slave Unit
Master Unit
Slave Unit
Compressor
M1C
124 Hz
OFF
124 Hz
OFF
Outdoor unit fan
M1F
Fan control
Fan control
Fan control
Fan control
Electronic expansion
valve (Main)
Y1E
480 pls
0 pls
Four way valve "ON":
0 pls
Four way valve
"OFF": 480 pls
Four way valve "ON":
0 pls
Four way valve
"OFF": 480 pls
Electronic expansion
valve (Refrigerant
charge)
Y2E
0 pls
0 pls
0 pls
0 pls
Electronic expansion
valve (Subcooling)
Y3E
0 pls
0 pls
0 pls
0 pls
Solenoid valve
(Refrigerant regulator
hot gas)
Y1S
OFF
OFF
OFF
OFF
Solenoid valve
(Refrigerant regulator
liquid pipe)
Y2S
OFF
OFF
OFF
OFF
Solenoid valve
(Refrigerant regulator
gas vent pipe)
Y3S
OFF
OFF
OFF
OFF
Solenoid valve (Hot
gas)
Y4S
OFF
OFF
OFF
OFF
Solenoid valve
(Circuit of oil return)
Y5S
OFF
OFF
OFF
OFF
Four way valve (Heat
exchanger switch)
Y6S
OFF
OFF
OFF
OFF
Four way valve (Dual
pressure gas pipe)
Y7S
OFF
OFF
OFF
OFF
Four way valve
(Mixing unit)
Y8S
OFF
OFF
OFF
OFF
Solenoid valve
(Mixing unit inlet)
Y9S
OFF
OFF
OFF
OFF
Ending condition
•
5 min. passed
•
Pe_min<0.49MPa
•
Pc_max>2.94MPa
•
Master unit Tdi > 110°C
•
Master unit Tp > 125°C
•
3 min. passed
•
Pe_min<0.25MPa
•
Pc_max>3.13MPa
•
Master unit Tdi > 110°C
•
Master unit Tp > 140°C
OR
OR
Summary of Contents for RQYQ140-180PY1
Page 216: ...Piping Diagrams SiBE341001 207 Appendix 1 2 BS Unit BSVQ100 160 250PV1 4D057985B...
Page 217: ...SiBE341001 Piping Diagrams Appendix 208 BSV4Q100PV1 3D064148...
Page 218: ...Piping Diagrams SiBE341001 209 Appendix BSV6Q100PV1 3D064149...
Page 220: ...Wiring Diagrams for Reference SiBE341001 211 Appendix 2 2 BS Unit BSVQ100 160 250PV1 3D055928C...
Page 221: ...SiBE341001 Wiring Diagrams for Reference Appendix 212 BSV4Q100PV1 3D063928B...
Page 222: ...Wiring Diagrams for Reference SiBE341001 213 Appendix BSV6Q100PV1 3D063929B...
Page 223: ...SiBE341001 Option List Appendix 214 3 Option List 3 1 Option Lists Outdoor Unit 3D066354...