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8.2.1.4. IPM (Power transistor) Prevention Control
A. Overheating Prevention Control
1. When the IPM temperature rises to 100°C, compressor operation will stop immediately.
2. Compressor operation restarts after three minutes the temperature decreases to 95°C.
B. DC Peak Current Control
1. When electric current to IPM exceeds set value of 18.5 A, the compressor will stop operate. Then, operation will restart after
three minutes.
2. If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will restart after two
minute.
3. If the set value is exceeded again within 30 seconds after the compressor starts, the operation will restart after one minute.
If this condition repeats continuously for seven times, all indoor and outdoor relays will be cut off.
8.2.1.5. Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The changes of frequency
are as below figure.
8.2.1.6. Low Pressure Prevention Control (Gas Leakage Detection)
a. Control start conditions
Control will perform when (1) - (3) condition continues operation for 5 minute and (4) is fulfill.
1. During cooling and dry operation: Frequency more than normal Fcmax.
During heating operation: Frequency more than normal Fh
2. Outdoor total current I cooling: Ib
I Ia
Heating: Ib
I Ic
Ic = Ia = 1.65 A
Ib = 0.65 A
3. It is not during deice operation.
4. During cooling and dry operation: indoor suction-indoor piping temperature is below 4°C.
During of heating operation: Indoor piping temperature-indoor suction is under 5°C.
Control contents:
• compressor stops (restart after 3 minutes)
• if happen 2 times within (20 minutes), perform the following operation
1) Unit stop operation
2) Timer LED blink and “F91” indicated
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CS-E9DKEW CU-E9DKE / CS-E12DKEW CU-E12DKE