SiEBE18-526 Special Control
Function 65
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 Outdoor unit operation
Compressor 124 Hz
Outdoor unit fan Fan control
Four way valve OFF
Main electronic expansion valve (EV1) 2000 pls
Subcooling electronic expansion valve
(EV2)
0 pls
Hot gas bypass valve (SVP) OFF
Receiver gas discharging valve (SVG) ON → OFF
Ending conditions
• 30 sec.
• Pe<0.5 MPa
• Td>110°C
or
Actuator Outdoor unit operation
Compressor 52 → 124 Hz
Outdoor unit fan STEP8
Four way valve ON
Main electronic expansion valve (EV1) 0 pls
Subcooling electronic expansion valve
(EV2)
0 pls
Hot gas bypass valve (SVP) ON → OFF
Receiver gas discharging valve (SVG) ON → OFF
Ending conditions
• 3 min.
• Pe<0.25 MPa
• Td>110°C
or
Actuator Operation Remarks
Compressor OFF ⎯
Outdoor unit fan OFF ⎯
Four way valve Keep former condition. ⎯
Main electronic expansion valve (EV1) 0 pls ⎯
Subcooling electronic expansion valve
(EV2)
0 pls ⎯
Hot gas bypass valve (SVP) OFF → ON ⎯
Receiver gas discharging valve (SVG) OFF ⎯
Ending conditions 5 min. ⎯
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