Protection Control For Cooling & Soft Dry Operation - Panasonic CS-Z20XKEW Service Manual

16.2 Protection Control for Cooling & Soft Dry Operation
16.2.1 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.

The compressor will be stopped to avoid compressor overloading.
16.2.2 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 60°C.

If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95 indicated: outdoor high pressure rise
protection).
16.2.3 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 13°C, the fan speed will return to its normal operation.
16.2.4 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
COMP. ON
-10°C
COMP. OFF
Outdoor
Air
Temperature
98
-12°C