Panasonic CS-E18SD3UAW service manual - Page 57

Cooling Overload Control, Dew Prevention Control 1, Freeze Prevention Control

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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 145.4°F.  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: o 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. 3 This control stopped if: o Compressor stopped. o Remote control setting changed. (fan speed/temperature) o Outdoor air temperature and indoor intake temperature changed. 13.2.4 Freeze Prevention Control 1 When indoor heat exchanger temperature is lower than 32°F continuously for six minutes, compressor will stop operating. 2 Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 41°F. 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 55.4°F, the fan speed will return to its normal operation. 57

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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 145.4°F.
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:
o
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.
3
This control stopped if:
o
Compressor stopped.
o
Remote control setting changed. (fan speed/temperature)
o
Outdoor air temperature and indoor intake temperature changed.
13.2.4
Freeze Prevention Control
1
When indoor heat exchanger temperature is lower than 32°F continuously for six minutes, compressor will
stop operating.
2
Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 41°F.
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 55.4°F, the fan speed will return to its normal operation.