Protection Control For Cooling & Soft Dry Operation - Panasonic CS-E12RB4UW Service Manual

13.2 Protection Control For Cooling & 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.

The compressor will be stopped to avoid compressor overloading.
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 63°C (145.4°F).

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 (32°F) continuously for 6 minutes, compressor will
stop operating.

Compressor will resume its operation after stop for 3 minutes and the indoor heat exchanger is higher than 5°C
(41°F).

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 (55.4°F), 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 (50°F) or
Compressor stops for freeze prevention control

Either one of the conditions above occurs 5 times in 40 minutes.
o

Control contents
Operation stops.
o
Timer LED blinks and "H99" indicated.
o
Free
25°C (77°F)
Limited Frequency
Outdoor
Air
Temperature
COMP. ON
-17.8°C (-0.4°F)
COMP. OFF
Outdoor
Air Temperature
48
22°C (71.6°F)
-20°C (-4°F)