Freeze Prevention Control; Freeze Prevention Control 2; Dew Prevention Control - Panasonic CS-S9NKUA Service Manual

12.10 Freeze Prevention Control

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When indoor heat exchanger temperature is lower than 32°F continuously for 6 minutes, compressor will stops
operation.
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Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 55.4°F.
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At the same time, indoor fan speed will be higher than during its normal operation.
•
If the indoor heat exchanger temperature is higher than 55.4°F for 5 minutes, the fan speed will return to its
normal operation.

12.11 Freeze Prevention Control 2

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Control start conditions
During Cooling operation and soft dry operation
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During thermo OFF condition, indoor intake temperature is less than 50°F or
Compressor stops for freeze prevention control
Either one of the conditions above occurs 5 times in 60 minutes.
o
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Control contents
Operation stops
o
Timer LED blinks and "H99" indicated
o

12.12 Dew Prevention Control

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To prevent dew formation at indoor unit discharge area.
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This control will be activated if:
Outdoor air temperature and indoor pipe temperature judgment by micro controller is fulfilled.
o
When cooling or dry mode is operated more than 20 minutes.
o
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This control stopped if:
Compressor stopped.
o
Remote control setting changed (fan speed/temperature).
o
Outdoor air temperature and indoor intake temperature changed.
o
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Fan speed, angle of louver (vertical airflow angle) will be adjusted accordingly in this control.
Fan speed will be increased slowly when control is activated until predetermine value.
o
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Compressor frequency will be regulated accordingly.
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