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12.5 Low Pressure Protection Control (Gas Leakage Detection)
• Control start conditions
o For 5 minutes, the compressor continously operates and outdoor total current is between 0.64A and 0.85A
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.
12.6 Low Frequency Protection Control 1
• When the compressor operates at frequency lower than 24Hz continued for 240 minutes, the operation frequency
will be changed to 23Hz for 2 minutes.
12.7 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
Indoor intake air (°F) T < 57.2 or T ≥ 86
Outdoor air (°F) T < 55.4 or T ≥ 100.4
Indoor heat exchanger (°F) T < 86
12.8 Outdoor Air Temperature Control
• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.
• This control will begin 1 minute after the compressor starts.
• Compressor frequency will adjust based on outdoor air temperature.
Free
Limited Frequency
Compressor OFF
Outdoor air temperature
100.4°F or 77°F
1.4°F
98.6°F or 71.6°F
1.4°F
12.9 Cooling Overload Control
• Pipe temperature limitation / restriction.
o Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor
operation frequency)
o The compressor stops if outdoor pipe temperature exceeds 141.8°F.
o If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise
protection)