Panasonic CS-S9NKR - Page 55

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12.1.4 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 107°C, compressor will be stopped, occurs 4 times per 20 minutes,
timer LED will be blinking. (“F97” is indicated.)
107°C
92°C
Comp. temperature
(Comp. Discharge temperature
Compressor = OFF
103°C
(105°C)
91°C
100°C
(95°C)
90°C
(85°C)
Compressor Frequency
Maintain
Compressor Frequency
Reduce
Free
103°C
88°C
Comp. temperature
(Comp. Discharge temperature
Compressor = OFF
99°C
87°C
96°C
86°C
Compressor Frequency
Maintain
Compressor Frequency
Reduce
Free
(S9, 12, 18NKR) (S24, 28NKR)
12.1.5 Low Pressure Prevention Control (Gas Leakage Detection)
• Control start conditions
o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.75A and 0.95A
(S9, 12NK), 1.38A and 1.65A (S18NK).
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 happen 2 times within 20 minutes, the unit will:
 Stop operation
 Timer LED blinks and “F91” indicated.
12.1.6 Low Frequency Protection Control 1
• When the compressor operates at frequency lower than 24 Hz continued for 20 minutes, the operation frequency
will be changed to 23 Hz for 2 minutes.
12.1.7 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 < 14 or T  30
Outdoor air (°C) T < 13 or T  38
Indoor heat exchanger (°C) T < 30