Protection Control For Cooling And Soft Dry Operation - Panasonic CS-VE9NKE Service Manual

13.1.8 4-Way Valve Operation Detection Control (Switching Abnormality between
Cooling and Heating)

When indoor heat exchanger exceeds 45°C (Cooling operation) or 0°C (Heating and Deice operation) in
4 minutes or 3 minutes (Deice operation) after compressor start, compressor will stopped.

If above condition occurs 4 times per 30 minutes or 4 times per 40 minutes (non-stop heating deice operation),
timer LED blinks "F11" indicated.
13.2

Protection Control for Cooling and Soft Dry Operation

13.2.1 Outdoor Air Temperature Control

The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.

This control will begin 1 minute after the compressor starts.

Compressor frequency will adjust base on outdoor air temperature.
13.2.2 Cooling Overload Control

Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation
frequency).

The compressor stop if outdoor pipe temperature exceeds 61°C.

If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95 indicated: outdoor high pressure rise
protection).
13.2.3 Freeze Prevention Control 1

When indoor heat exchanger temperature is lower than 0°C continuously for 6 minutes, compressor will stop
operating.

Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 5°C.

At the same time, indoor fan speed will be higher than during its normal operation.

If indoor heat exchanger temperature is higher than 5°C for 5 minutes, the fan speed will return to its normal
operation.
13.2.4 Freeze Prevention Control 2

Control start conditions
During Cooling operation and soft dry operation
o
 During thermo OFF condition, indoor intake temperature is less than 10°C or
 Compressor stops for freeze prevention control
Either one of the conditions above occurs 5 times in 60 minutes.
o

Control contents
Operation stops.
o
Timer LED blinks and "H99" indicated.
o
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