Panasonic CS-S18NKUA Service Manual

Also see for CS-S24NKUA: Manual Operating instructions

Panasonic CS-S18NKUA Service Manual Manual pdf 33 page image

3312.5 Compressor Overheating Prevention Control• Instructed frequency for compressor operation will be regulated by compressor discharge temperature. Thechanges of frequency are as below.• If compressor discharge temperature exceeds 233.6°F, compressor will be stopped, occurs 4 times per 20minutes, timer LED will be blinking. “F97” is indicated.12.6 Low Pressure Protection Control (Gas Leakage Detection)• Control start conditionso For 5 minutes, the compressor continously operates and outdoor total current is between 0.81A and 1.23A.o During Cooling and Soft Dry operation:Indoor suction temperature – indoor piping temperature is below 7.2°F• Control contentso 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 25Hz continued for 240 minutes, the operation frequencywill be change to 24Hz for 2 minutes.12.8 Low Frequency Protection Control 2• When all below conditions comply, minimum limit of compressor frequency will be set.Temperature, T, for: Cooling / Soft DryIndoor intake air (°F) T < 57.2 or ≥ 86Outdoor air (°F) T < 55.4 or T ≥ 100.4Indoor heat exchanger (°F) T < 8612.9 Outdoor Air Temperature Control• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in thediagram below.• This control will begin 1 minute after the compressor starts.• Compressor frequency will adjust based on outdoor air temperature.FreeLimited FrequencyOutdoor air temperature100.4°F or 77°F98.6°F or 71.6°F