Specifications

SiBE28-805 Special Control
Function 43
3.4 Pump-down Residual Operation
3.4.1 Pump-down Residual Operation in Cooling 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.
3.4.2 Pump-down Residual Operation in Heating Operation
Actuator Master unit operation Slave unit operation
Compressor 124 Hz OFF
Outdoor unit fan Fan control OFF
Four way valve OFF OFF
Main motorized valve (EV1) 480 pls 0 pls
Subcooling motorized valve (EV2) 0 pls 0 pls
Hot gas bypass valve (SVP) OFF OFF
Accumulator oil return valve (SVO) ON ON
Ending conditions
• 5 min.
or
Actuator Master unit operation Slave unit operation
Compressor 124 Hz OFF
Outdoor unit fan STEP7 STEP4
Four way valve ON ON
Main motorized valve (EV1) 0 pls 0 pls
Subcooling motorized valve (EV2) 0 pls 0 pls
Hot gas bypass valve (SVP) OFF OFF
Accumulator oil return valve (SVO) ON ON
Ending conditions
• 3 min.
or