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13.1.4 IPM (Power transistor) Protection Control.
1. DC Peak Current Control
● When electric current to IPM exceeds set value of 7A(for RE9NKR) and 15.7A(for RE12NKR) the
compressor will stop. It will restart after three minutes.
● If the set value is exceeded again within 30 seconds, the operation will restart after one minute.
● If this condition repeats continuously for seven times, all indoor and outdoor relays will be cut off.
● Error code [F99] will be displayed.
2. Overheating protection control
When the IPM temperature rises to 112 ℃ , compressor will stop immediately.
Compressor restarts after three minutes if the temperature decreases to 110℃
13.1.5 Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated compressor discharge temperature. The change of
frequency is as below.
CU-RE9NKR CU-RE12NKR
13.1.6 Low Operation Frequency Protection Control
●
When the compressor operation frequency is lower than 24Hz and continuing for 240 minutes, the operation
frequency will be changed to 23Hz for 2 minutes. This is to prevent the compressor in too low frequency for long time.
●
If all following conditions fulfilled, the compressor will run in the frequency of 30 Hz.
Models RE9NKR, RE12NKR
Intake Air Temp.
≥30 ℃ or ＜14 ℃ ≥28 ℃ or ＜14 ℃
Outdoor Temp.
≥38 ℃ or ＜13 ℃ ≥24 ℃ or ＜4 ℃
Indoor Piping Temp.
＜30 ℃ ≥0 ℃
Operation Mode Cool / Dry Heat
13.1.7 Low Pressure Prevention Control (Gas Leakage Detection)
a. Control start conditions
• For 5 minutes, the compressor continuously operates and outdoor total current is between 0.83A and 1.05A.
• During Cooling and Soft Dry operations:
Indoor suction temperature - indoor piping temperature is below 4℃.
Indoor temperature and outdoor temperature is 30±5℃.
Remote Control setting 16℃ and Hi Fan Speed.
• During Heating operations:
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