Outdoor Air Temperature Control; Cooling Overload Control; Freeze Prevention Control; Freeze Prevention Control 2 - Panasonic CS-S18JKQ Service Manual

12.10 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 based on outdoor air temperature.

12.11 Cooling Overload Control

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Pipe temperature limitation / restriction.
Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor
o
operation frequency)
The compressor stops if outdoor pipe temperature exceeds 61°C.
o
If the compressor stops 4 times in 20 minutes, Timer LED blinks ("F95" indicated: Outdoor high pressure rise
o
protection)

12.12 Freeze Prevention Control

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When indoor heat exchanger temperature is lower than 0°C continuously for 6 minutes, compressor will stops
operation.
•
Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 13°C.
•
At the same time, indoor fan speed will be higher than during its normal operation.
•
If the indoor heat exchanger temperature is higher than 13°C for 5 minutes, the fan speed will return to its normal
operation.

12.13 Freeze Prevention Control 2

•
Control start conditions
During Cooling operation and soft dry operation
o
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.
o
•
Control contents
Operation stops
o
Timer LED blinks and "H99" indicated
o

12.14 Dew Prevention Control

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To prevent dew formation at indoor unit discharge area.
•
This control will be activated if:
Cooling mode or Quiet mode is activated.
o
Remote control setting temperature is less than 25°C.
o
Fan Speed is at CLo or QLo.
o
Room temperature is constant (±1°C) for 30 minutes.
o
Compressor is continuously running.
o
•
Fan speed 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.
o
Free
38°C
Limited Frequency
Outdoor air temperature
38
37°C