Protection Control For Cooling & Soft Dry Operation - Panasonic CS-NE9LKE 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.
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.
• 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
1. When indoor heat exchanger temperature is lower than 0°C continuously for 6 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 5°C for 5 minutes, the fan speed will return to its normal operation.
13.2.4. Freeze Prevention Control 2
1. Control start conditions
• During Cooling operation and soft dry operation
- 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.
2. Control contents
• Operation stops
• Timer LED blinks and "H99" indicated
13.2.5. Dew Prevention Control 1
• To prevent dew formation at indoor unit discharge area.
• This control will be activated if:
- Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled.
- When Cooling or Dry mode is operated more than 20 minutes or more.
• This control stopped if:
- Compressor stopped.
- Remote control setting changed (fan speed / temperature).
- Outdoor air temperature and indoor intake temperature changed.
• Fan speed, angle of louver (vertical airflow angle) will be adjusted accordingly in this control.
- Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.
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