Daikin EWAQ032BAW - Pump-Down Residual Operation; Pump-Down Residual Operation in Cooling Operation; Pump-Down Residual Operation in Heating Operation

Special Control ESIE11-05
50 Functional Description
3.3 Pump-down Residual Operation
3.3.1 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.
* Actuators are based on EWYQ032BA.
3.3.2 Pump-down Residual Operation in Heating Operation
* Actuators are based on EWYQ032BA.
Remark Pump-down operation is finished very fast due to the limited size of the refrigerant circuit.
Actuator Operation
Compressor 124 Hz + OFF + OFF
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
Accumulator oil return valve (SVO) ON
Hydrobox electronic expansion valve (K11E) 0 pls
Hydrobox electronic expansion valve (K21E) 0 pls
Ending conditions
 5 min.
 Master Unit Pe<0.49 MPa
 Master Unit Td>110C
Master Unit Pc>2.94 MPa
or
Actuator Operation
Compressor 124 Hz + OFF + OFF
Outdoor unit fan STEP 7
Four way valve ON
Main electronic expansion valve (EV1) 0 pls
Subcooling electronic expansion valve (EV2) 0 pls
Hydrobox electronic expansion valve (K11E) 2000 pls
Hydrobox electronic expansion valve (K21E) 2000 pls
Hot gas bypass valve (SVP) OFF
Accumulator oil return valve (SVO) ON
Ending conditions
 3 min.
 Master Unit Pe<0.25 MPa
 Master Unit Td>110C
 Master Unit Pc>2.94 MPa
or