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Daikin VRV III-S RXYMQ36 48PVJU Service Manual: Pump Down Residual Operation

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Special Control
3.4

Pump Down Residual Operation

When activating compressor, if the liquid refrigerant remains in the heatexchanger, 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 heatexchanger when
the compressor is down.
3.4.1 Pump Down Residual Operation in Cooling Operation
Actuator
Compressor
Outdoor unit fan
Four-way valve (Y1S)
Main electronic expansion valve (EV1)
Subcooling electronic expansion valve
(EV3)
Hot gas bypass valve (SVP)
Ending conditions
3.4.2 Pump Down Residual Operation in Heating Operation
Actuator
Compressor
Outdoor unit fan
Four-way valve (Y1S)
Main electronic expansion valve (EV1)
Subcooling electronic expansion valve
(EV3)
Hot gas bypass valve (SVP)
Ending conditions
40
Pump down residual operation Step 1
124 Hz Full load
Fan control
OFF
480 pls
0 pls
OFF
2 sec.
Pump down residual operation
124 Hz Full load
STEP 7
ON
0 pls
0 pls
OFF
4 sec.
Pump down residual operation Step 2
52 Hz Full load
Fan control
OFF
240 pls
0 pls
OFF
2 sec.
SiUS34-907
Function

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  • cp shukla Feb 16, 2016 06:50:
    RXYQ18PAY6 service manual & vrv Fulform