Panasonic CS-E18NKUA, Service Manual

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13.2.2 Cooling Overload Control
š
Pipe temperature limitation / restriction.
o
Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor
operation frequency)
o
The compressor stops if outdoor pipe temperature exceeds 145.4°F.
o
If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise
protection)
13.2.3 Freeze Prevention Control 1
š
When indoor heat exchanger temperature is lower than 32°F continuously for 6 minutes, compressor will stops
operation.
š
Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 41.0°F.
š
At the same time, indoor fan speed will be higher than during its normal operation.
š
If the indoor heat exchanger temperature is higher than 55.4°F for 5 minutes, the fan speed will return to its
normal operation.
13.2.4 Freeze Prevention Control 2
š
Control start conditions
o
During Cooling operation and soft dry operation
ƒ During thermo OFF condition, indoor intake temperature is less than 50.0°F or
ƒ Compressor stops for freeze prevention control
o
Either one of the conditions above occurs 5 times in 60 minutes.
š
Control contents
o
Operation stops
o
Timer LED blinks and “H99” indicated
13.2.5 Dew Prevention Control 1
š
To prevent dew formation at indoor unit discharge area.
š
This control will be activated if:
o
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.
š
This control stopped if:
o
Compressor stopped.
o
Remote control setting changed (fan speed / temperature).
o
Outdoor air temperature and indoor intake temperature changed.
š
Fan speed, angle of louver (vertical airflow angle) will be adjusted accordingly in this control.
1. Fan speed will be increased slowly when control is activated until predetermine value.
š
Compressor frequency will be regulated accordingly.
13.2.6 Protection Control For Heating Operation
13.2.6.1 Intake Air Temperature Control
Compressor will operate at limited freq., if indoor intake air temperature is 86.0°F or above.
13.2.6.2 Outdoor Air Temperature Control
š
The Max current value is regulated when the outdoor air temperature rise above 57.2°F in order to avoid
compressor overloading.