Panasonic CU-HE12NKE [49/110] Compressor overheating prevention control

13.1.4 Compressor Overheating Prevention Control

• Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The changes of

frequency are as below.

• If compressor discharge temperature exceeds 103°C, compressor will be stopped, occurs 4 times per 20 minutes, timer LED

will be blinking. (“F97” is indicated.)

103°C

88°C

Comp. Discharge temperature

Compressor = OFF

99°C

87°C

Compressor Frequency

Reduce

96°C

86°C

Compressor Frequency

Maintain

Free

13.1.5 Low Pressure Prevention Control (Gas Leakage Detection)

a. Control start conditions

• For 5 minutes, the compressor continuously operates and outdoor total current is between 0.6A and 1.15A.

• During Cooling and Soft Dry operations:

Indoor suction temperature - indoor piping temperature is below 4°C.

• During Heating operations :

Indoor piping temperature - indoor suction is under 5°C.

b. Control contents

• Compressor stops (and restart after 3 minutes).

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

o Stop operation

o Timer LED blinks and “F91” indicated.

13.1.6 Low Frequency Protection Control 1

• When the compressor operate at frequency lower than 24 Hz continued for 240 minutes, the operation frequency

will be changed to 23 Hz for 2 minutes.

13.1.7 Low Frequency Protection Control 2

• When all the below conditions comply, the compressor frequency will change to lower frequency.

Temperature, T, for: Cooling / Soft Dry Heating

Indoor intake air (°C) T < 14 or T ≥ 30 T < 14 or T ≥ 28

Outdoor air (°C) T < 13 or T ≥ 38 T < 4 or T ≥ 24

Indoor heat exchanger (°C) T < 30 T < 0