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12.9 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.
12.10 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 (for S9NK and S12NK), 145.4°F (for
S18NK and S22NK).
o If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise
protection)
12.11 Freeze Prevention Control
• When indoor heat exchanger temperature is lower than 32°F continuously for 6 minutes, compressor will stops
operation.
• Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 55.4°F.
• At the same time, indoor fan speed will be higher than during its normal operation.
• If the indoor heat exchanger temperature is higher than 55.4°F for 5 minutes, the fan speed will return to its
normal operation.
12.12 Freeze Prevention Control 2
• Control start conditions
o During Cooling operation and soft dry operation
During thermo OFF condition, indoor intake temperature is less than 50°F or
Compressor stops for freeze prevention control
o Either one of the conditions above occurs 5 times in 60 minutes.
• Control contents
o Operation stops
o Timer LED blinks and “H99” indicated
12.13 Dew Prevention Control
• To prevent dew formation at indoor unit discharge area.
• This control will be activated if:
o Cooling mode or Quiet mode is activated.
o Remote control setting temperature is less than 77°F.
o Fan Speed is at CLo or QLo.
o Room temperature is constant (±33.8°F) for 30 minutes.
o Compressor is continuously running.
• Fan speed will be adjusted accordingly in this control.
o Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.
Free
Limited Frequency
Outdoor air temperature
100.4°F or 77°F (For S18/22NK)
98.6°F or 71.6°F (For S18/22NK)