Panasonic CS-E12NKDW, Service Manual

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14.2 Protection Control For Cooling & Soft Dry Operation
14.2.1 Outdoor Air Temperature Control
š
The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
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This control will begin 1 minute after the compressor starts.
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Compressor frequency will adjust base on outdoor air temperature.
14.2.2 Cooling Overload Control
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Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation
frequency).
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The compressor stop if outdoor pipe temperature exceeds 61°C (E7 ~ 15NK) and 63°C (E18NK).
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If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95 indicated: outdoor high pressure rise
protection).
14.2.3 Freeze Prevention Control 1
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When indoor heat exchanger temperature is lower than 0°C continuously for 6 minutes, compressor will stop
operating.
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Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 5°C.
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At the same time, indoor fan speed will be higher than during its normal operation.
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If indoor heat exchanger temperature is higher than 5°C for 5 minutes, the fan speed will return to its normal
operation.
14.2.4 Freeze Prevention Control 2
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Control start conditions
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During Cooling operation and soft dry operation
ƒ During thermo OFF condition, indoor intake temperature is less than 10°C or
ƒ
Compressor stops for freeze prevention control
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Either one of the conditions above occurs 5 times in 60 minutes.
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Control contents
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Operation stops
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Timer LED blinks and “H99” indicated
14.2.5 Dew Prevention Control 1
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To prevent dew formation at indoor unit discharge area.
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This control will be activated if:
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Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled.
o
When Cooling or Dry mode is operated more than 20 minutes or more.
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This control stopped if:
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Compressor stopped.
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Remote control setting changed (fan speed / temperature).
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Outdoor air temperature and indoor intake temperature changed.
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Fan speed will be adjusted accordingly in this control.