Panasonic CS-VE9NKE Service Manual page 57

13.3.4 Low Temperature Compressor Oil Return Control

In heating operation, if the outdoor temperature falls below -10°C when compressor starts, the compressor
frequency will be regulated up to 600 seconds.
13.3.5 Cold Draught Prevention Control

When indoor pipe temperature is low, cold draught operation starts where indoor fan speed will be reduced.
13.3.6 Deice Operation

When outdoor pipe temperature and outdoor air temperature is low, deice operation starts.

Deice Start condition
Outdoor air temperature sensor1 detects temperature below 9°C continuously for 40 minutes, for the next 20
o
minutes if the temperature is below line A for 3 minutes.
Outdoor air temperature sensor1 detects temperature below 9°C continuously for 40 minutes, if the
o
temperature is below line A and line B for 3 minutes.
Heating operation operates without deicing operation continuously for 24 hour, outdoor temperature is below
o
3°C.
Non-stop Heating Deice Operation
Without Heating Deice Operation
4-way valve is switched and deicing is performed by cooling cycle.
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Unit stop heating operation for maximum 12 minutes.
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During this operation the power indicator blinks and the vertical airflow direction louver is left open.
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