Special Control ESIE09-08A
60 Function
3.3 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.
3.3.1 Pump-down Residual Operation in Heating Operation [R-410A]
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.
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