Panasonic CS-E9RKUAW Service Manual page 62

15.1.5 Compressor Overheating Prevention Control

Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The
changes of frequency are as below.

If compressor discharge temperature exceeds 224.6°F, compressor will be stopped, occurs 4 times per
20 minutes, timer LED will be blinking. ("F97" is indicated.)
15.1.6 Low Pressure Prevention Control (Gas Leakage Detection)

Control start conditions
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.64A and 0.85A.
o
During Cooling and Soft Dry operations:
o
Indoor suction temperature - indoor piping temperature is below 7.2.°F.
During Heating operations:
o
Indoor piping temperature - indoor suction is under 9°F.

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.

15.1.7 Low Frequency Protection Control 1

When the compressor operates at frequency lower than 24Hz continued for 240 minutes, the operation frequency
will be changed to 25Hz for 2 minutes.
15.1.8 Low Frequency Protection Control 2

When all below conditions comply, minimum limit of compressor will be set.
Indoor intake air (°F)
Outdoor air (°F)
Indoor heat exchanger (°F)
o
224.6 F
Compressor Frequency
o
217.4 F
Compressor Frequency
o
212 F
Comp. Discharge temperature
Temperature, T, for:
Compressor = OFF
o
197.6 F
Reduce
o
195.8 F
Maintain
o
194 F
Free
Cooling / Soft Dry
T < 57.2 or T ≥ 86
T < 55.4 or T ≥ 100.4 T < 57.2 or T ≥ 82.4
T < 86
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Heating
-
T ≥ 32