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12.4.2 S18NK, S22NK
• Overheating Prevention Control
o When the IPM temperature rises to 212°F, compressor operation will stop immediately.
o Compressor operation restarts after 3 minutes the temperature decreases to 203°F.
• DC Peak Current Control
o When electric current to IPM exceeds set value of 29.9A, the compressor will stop operate. Then, operation
will restart after 3 minutes.
o If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will
restart after 2 minute.
o If the set value is exceeded again within 30 seconds after the compressor starts, the operation will restart
after 1 minute. If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off.
12.5 Compressor Overheating Prevention Control (For S18, S22NK 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 233.6°F, compressor will be stopped, occurs 4 times per 20
minutes, timer LED will be blinking. “F97” is indicated.
12.6 Low Pressure Protection Control (Gas Leakage Detection)
• Control start conditions
o For 5 minutes, the compressor continously operates and outdoor total current is between 0.66A and 1.25A
(S9NK and S12NK) or 0.81A and 1.23A (S18NK and S22NK).
o During Cooling and Soft Dry operation:
Indoor suction temperature – indoor piping temperature is below 39.2°F
• 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.
12.7 Low Frequency Protection Control 1
• When the compressor operates at frequency lower than 26Hz continued for 20 minutes, the operation frequency
will be changed to 25Hz for 2 minutes. (For S9NK and S12NK)
• When the compressor operates at frequency lower than 25Hz continued for 240 minutes, the operation frequency
will be change to 24Hz for 2 minutes. (For S18NK and S22NK)
12.8 Low Frequency Protection Control 2
• When all below conditions comply, minimum limit of compressor frequency will be set.
Cooling / Soft Dry
Temperature, T, for:
S9NK and S12NK S18NK and S22NK
Indoor intake air (°F) T < 59 or T ≥ 86 T < 57.2 or ≥ 86
Outdoor air (°F) T < 60.8 or T ≥ 100.4 T < 55.4 or T ≥ 100.4
Indoor heat exchanger (°F) T < 86 T < 86