14.1.5Compressor Overheating Prevention Control

šInstructed frequency for compressor operation will be regulated by compressor discharge temperature. The changes of frequency are as below.

šIf compressor discharge temperature exceeds 224.6°F, compressor will be stopped, occurs 4 times per 20 minutes, timer LED will be blinking. (“F97” is indicated.)

14.1.6Low Pressure Prevention Control (Gas Leakage Detection)

šControl start conditions

o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.64A and 0.85A. o During Cooling and Soft Dry operations:

Indoor suction temperature - indoor piping temperature is below 39.2.°F. o During Heating operations:

Indoor piping temperature - indoor suction is under 41°F.

šControl contents

o Compressor stops (and restart after 3 minutes).

o If the conditions above happen 2 times within 20 minutes, the unit will:

ƒStop operation

ƒTimer LED blinks and “F91” indicated.

14.1.7Low Frequency Protection Control 1

šWhen the compressor operates at frequency lower than 24Hz continued for 240 minutes, the operation frequency will be changed to 25Hz for 2 minutes.

14.1.8Low Frequency Protection Control 2

šWhen all below conditions comply, minimum limit of compressor will be set.

Temperature, T, for:

Cooling / Soft Dry

 

 

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

 

 

Heating

-

T < 57.2 or T ≥ 82.4

T ≥ 32

14.2Protection Control For Cooling & Soft Dry Operation

14.2.1Outdoor Air Temperature Control

šThe maximum current value is regulated when the outdoor air temperature rise above 57.2°F in order to avoid compressor overloading.

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Panasonic CS-E9NKUAW Protection Control For Cooling & Soft Dry Operation, Compressor Overheating Prevention Control

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