Compressor Overheating Prevention Control; Low Pressure Prevention Control (Gas Leakage Detection); Low Frequency Protection Control 1; Low Frequency Protection Control 2 - Panasonic CS-S9TKV Service Manual

13.5 Compressor Overheating Prevention Control


Instructed frequency for compressor operation will be regulated by compressor temperature. The changes of
frequency are as below.

If compressor temperature exceeds 107°C, compressor will be stopped, occurs 4 times per 20 minutes, timer
LED will be blinking. "F97" is indicated.

13.6 Low Pressure Prevention Control (Gas Leakage Detection)


Control start conditions
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.65 A and 1.65 A.
o
During Cooling and Soft Dry operation:
o
Indoor suction temperature - indoor piping temperature is below 4°C.

Control contents
Compressor stops (and restart after 3 minutes).
o
If the conditions above happened 2 times within 20 minutes, the unit will:
o
 Stop operation.
Timer LED blinks and "F91" indicated.


13.7 Low Frequency Protection Control 1


When the compressor operates at frequency lower than 24 Hz continued for 240 minutes, the operation
frequency will be changed to 23 Hz for 2 minutes.

13.8 Low Frequency Protection Control 2


When all below conditions comply, the compressor frequency will changed to lower frequency.
Compressor=OFF
107°C
Compressor Frequency
103°C
Compressor Frequency
100°C
Comp Tank temperature
Temperature, T, for:
Indoor intake air (°C)
Outdoor air (°C)
Indoor heat exchanger (°C)
Reduced
Maintain
Free
Cooling / Soft Dry
T < 14 or T ≥ 30
T < 13 or T ≥ 38
T < 30
87
92°C
91°C
90°C