Panasonic cs-s9pkv, Service Manual

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13.5 Compressor Overheating Prevention Control (For S18, S24, 28PK only)

Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The
changes of frequency are as below.

If compressor discharge temperature exceeds 112°C, compressor will be stopped, occurs 4 times per 20 minutes,
timer LED will be blinking. “F97” is indicated.
Compressor=OFF
Compressor Frequency
Reduced
Compressor Frequency
Maintain
Free
Comp Discharge temperature
112°C
96°C
110°C
100°C
97°C
90°C
13.6 Low Pressure Prevention Control (Gas Leakage Detection)

Control start conditions
o
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.65A and 1.65A.
o
During Cooling and Soft Dry operation:
Indoor suction temperature – indoor piping temperature is below 4°C

Control contents
o
Compressor stops (and restart after 3 minutes).
o
If the conditions above happened 2 times within 20 minutes, the unit will:
 Stop operation
 Timer LED blinks and “F91” indicated.
13.7 Compressor Tank Temperature Rise Protection Control

Control start conditions
o
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.65A and 1.65A.
o
During Cooling and Soft Dry operation:
 Indoor suction temperature -indoor piping temperature is below 4°C.
 Indoor temperature and outdoor temperature is 30±5°C.
 Remote Control setting 16°C and Hi Fan Speed.

Control contents
o
Compressor stops (and restart after 3 minutes)
o
If the conditions above happened 2 times within 20 minutes, the unit will:
 Stop operation
 Timer LED blinks and “F91” indicated.
13.8 Low Frequency Protection Control 1

When the compressor operates at frequency lower than 24Hz continued for 20 minutes, the operation frequency
will be changed to 23Hz for 2 minutes.
13.9 Low Frequency Protection Control 2

When all below conditions comply, the compressor frequency will changed to lower frequency.
Temperature, T, for: Cooling / Soft Dry
Indoor intake air (°C) T < 15 or T ≥ 30
Outdoor air (°C) T < 16 or T ≥ 38
Indoor heat exchanger (°C) T < 30