Panasonic CU-E12QD3EA Service Manual page 51

13.2.2 Cooling Overload Control
i. Pipe temperature limitation/restriction
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.
If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95: outdoor high pressure rise protection)
13.2.3 Dew Prevention Control 1
1 To prevent dew formation at indoor unit discharge area.
2 This control activated if:
Outdoor air temperature and Indoor pipe temperature judgment by microcontroller if fulfilled.
o
When Cooling or Dry mode is operated more than 20 minutes or more.
o
3 This control stopped if:
Compressor stopped.
o
Remote control setting changed. (fan speed / temperature)
o
Outdoor air temperature and indoor intake temperature changed.
o
13.2.4 Dew Prevention Control 2
1 To prevent dew formation at indoor unit discharge area.
2 This control starts if all conditions continue for 20 minutes:
Operated with Cooling or Soft Dry Mode.
o
Indoor intake temperature is between 25°C and 29°C.
o
Outdoor air temperature is less than 30°C.
o
Quiet Lo fan speed.
o
3 This control stopped if:
When receive air swing change signal from Remote Control.
o
13.2.5 Freeze Prevention Control
1 When indoor heat exchanger temperature is lower than 0°C continuously for six minutes, compressor will
stop operating.
2 Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 5°C.
3 At the same time, indoor fan speed will be higher than during its normal operation.
4 If indoor heat exchanger temperature is higher than 13°C, the fan speed will return to its normal operation.
AMP Air Conditioning
51
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