Outline of Control
SiE-05C
232
Functions PLUS Series
4.6
Heating Pump Down Residual Operation (For Heat Pump System)
If refrigerant collects in the accumulator, the liquid refrigerant is sucked into the compressor when it starts.
This dilutes the refrigeration oil in the compressor and lowers the oil’s ability to provide lubrication. Low
pressure side refrigerant is therefore discharged when the compressor is stopped in order to prevent this
from happening.
4.6.1
Conditions for Pump Down Residual Operation
Operation contents
Outdoor unit EEV are either 300m PLS or fully closed due to low pressure.
Completion conditions (k:kg/cm
²
)
This control is executed if stopped during defrost or oil return.
Pump down is started if a start command is received during residual operation.
&
INV compressor discharge temp. < 95˚C when off
Any one
of these
(1~4)
1. Stopped no more than 10 minutes from compressor start
2. No more than 20 minutes from completion of defrost or oil return
3. Outdoor temp. < -5˚C
4. INV compressor oil temp. < Te + 10˚C
Outdoor temp.
Outdoor unit function
L unit function
Indoor unit function
Compressor
EEV
Receiver gas purge
solenoid valve
EEV
Less than -10˚C
-10˚C
≤
Temp. < 0˚C
Min. 0˚C
86Hz + OFF
76Hz + OFF
60Hz + OFF
300 PLS or fully
closed
ON
300 PLS
Any one
of these
(1~5)
1. Low pressure less than 0.7k after 30 sec. subsequent to start of residual operation
2. Hp > 22k
3. INV compressor oil temp. > 110˚C
4. Retry, malfunction
5. 10 minutes have elapsed since start of residual operation
SI-05C.BOOK Page 232 Monday, November 6, 2000 4:13 PM
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