SiBE12-908
Troubleshooting
Service Diagnosis
147
2.31 Insufficient Gas
Remote
Controller Display
U0
Outdoor Unit LED
Display
A
5
5
5
( - )
Method of
Malfunction
Detection
Gas shortage detection I:
Gas shortage is detected by checking the input current value and the compressor running
frequency. If the gas is short, the input current is smaller than the normal value.
Gas shortage detection II:
Gas shortage is detected by checking the discharge temperature and the opening of the
electronic expansion valve. If the gas is short, the discharge temperature tends to rise.
Malfunction
Decision
Conditions
Gas shortage detection I:
40 class
The following conditions continue for 7 minutes.
Input current × input voltage
≤
2111 / 256 × output frequency - 361 (W)
Output frequency > 51 (Hz)
50 class
The following conditions continue for 7 minutes.
Input current × input voltage
≤
4628 / 256 × output frequency - 608 (W)
Output frequency > 48 (Hz)
Gas shortage detection II:
The following conditions continue for 80 seconds.
Target opening of the electronic expansion valve
≥
450 (pulse)
Discharge temperature > 128 / 128 × target discharge tempe20 (°C)
If a gas shortage error takes place 4 times straight, the system will be shut down. The error
counter will reset itself if this or any other error does not occur during the following 60-minute
compressor running time (total time).
Supposed
Causes
Refrigerant shortage (refrigerant leakage)
Refrigerant heat exchanger drift
Poor compression performance of compressor
Closed stop valve
Defective electronic expansion valve