Panasonic CS-E9PKEA Service Manual page 51

13.1.4 Compressor Overheating Prevention Control
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Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The
changes of frequency are as below.
•
If compressor discharge temperature exceeds 107°C, compressor will be stopped, occurs 4 times per 20 minutes,
timer LED will be blinking. ("F97" is indicated.)
13.1.5 Low Pressure Prevention Control (Gas Leakage Detection)
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Control start conditions
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.75A and 0.95A
o
(E9/12/15PKEA), 1.38A and 1.65A (E18PKEA).
During Cooling and Soft Dry operations:
o
Indoor suction temperature - indoor piping temperature is below 4°C.
During Heating operations :
o
Indoor piping temperature - indoor suction is under 5°C.
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Control contents
Compressor stops (and restart after 3 minutes).
o
If the conditions above happen 2 times within 20 minutes, the unit will:
o
Stop operation
Timer LED blinks and "F91" indicated.
13.1.6 Low Frequency Protection Control 1
•
When the compressor operate at frequency lower than 24 Hz continued for 20 minutes, the operation frequency
will be changed to 23 Hz for 2 minutes.
13.1.7 Low Frequency Protection Control 2
•
When all the below conditions comply, the compressor frequency will change to lower frequency.
Indoor intake air (°C)
Outdoor air (°C)
Indoor heat exchanger (°C)
Temperature, T, for: Cooling/Soft Dry
T < 14 or T ≥ 30
T < 13 or T ≥ 38
T < 30
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Heating
T < 14 or T ≥ 28
T < 4 or T ≥ 24
T ≥ 0