Low Pressure Prevention Control (Gas Leakage Detection); Low Frequency Protection Control 1; Low Frequency Protection Control 2 - Panasonic CS-TZ20TKEW Service Manual

16.1.5

Low Pressure Prevention Control (Gas Leakage Detection)


Control start conditions
For 5 minutes, the compressor continuously operates and outdoor total current is between 0.75A and 0.95A.
o
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.

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.
16.1.6

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.
16.1.7

Low Frequency Protection Control 2


When all the below conditions comply, the compressor frequency will change to lower frequency.
Temperature, T, for:
Indoor intake air (°C)
Outdoor air (°C)
Indoor heat exchanger (°C)
AMP Air Conditioning
Compressor = OFF
103°C
Compressor Frequency
Reduce
99°C
Compressor Frequency
Maintain
96°C
Free
Comp. temperature
Cooling/Soft Dry
T < 14 or T ≥ 30
T < 13 or T ≥ 38
T < 30
84
88°C
87°C
86°C
Heating
T < 14 or T ≥ 28
T < 4 or T ≥ 24
T ≥ 0
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