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SiEN18-622
Special Control
Function
105
3.4
Pump-down Residual Operation
When activating compressor, if the liquid refrigerant remains in the heat-exchanger, the liquid
enters into the compressor and dilutes oil therein resulting in decrease of lubricity.
Therefore, the pump-down residual operation is performed to collect the refrigerant in the heat-
exchanger when the compressor is down.
3.4.1 Pump-down Residual Operation in Cooling Operation
3.4.2 Pump-down Residual Operation in Heating Operation
3.5
Restart Standby
Restart is stood by force to prevent frequent power-on/off and to equalize pressure in the
refrigerant system.
Actuator
Pump-down residual operation Step 1
Pump-down residual operation Step 2
Compressor
124 Hz Full load
52 Hz Full load
Outdoor unit fan
Fan control
Fan control
Four way valve
OFF
OFF
Main electronic expansion valve (EV1)
480 pls
240 pls
Subcooling electronic expansion valve
(EV3)
0 pls
0 pls
Hot gas bypass valve (SVP)
OFF
OFF
Ending conditions
2 sec.
2 sec.
Actuator
Pump-down residual operation
Compressor
124 Hz Full load
Outdoor unit fan
STEP7
Four way valve
ON
Main electronic expansion valve (EV1)
0 pls
Subcooling electronic expansion valve
(EV3)
0 pls
Hot gas bypass valve (SVP)
OFF
Ending conditions
4 sec.
Actuator
Operation
Remarks
Compressor
OFF
⎯
Outdoor unit fan
Ta>30
°
C: STEP4
Ta
≤
30
°
C: OFF
⎯
Four way valve
Keep former condition.
⎯
Main electronic expansion valve (EV1)
0 pls
⎯
Subcooling electronic expansion valve
(EV3)
0 pls
⎯
Hot gas bypass valve (SVP)
OFF
⎯
Ending conditions
2 min.
⎯
Summary of Contents for FTKS50BVMB
Page 1: ...SiEN18 622 E Series Service Manual Applied Models zSuper Multi Plus Cooling Only Heat Pump ...
Page 105: ...Refrigerant Flow for Each Operation Mode SiEN18 622 92 Refrigerant Circuit ...
Page 157: ...Indoor Unit SkyAir Models SiEN18 622 144 Function ...
Page 312: ...SiEN18 622 Ceiling Mounted Cassette Type System Configuration 300 ...
Page 424: ...Method of Replacing The Inverter s Power Transistors Modules SiEN18 622 412 Troubleshooting ...
Page 446: ...Wiring Diagrams SiEN18 622 434 Appendix ...
Page 452: ...SiEN18 622 vi Index ...