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Si12-619A
Troubleshooting
Service Diagnosis
255
5.26.2 E Series (50-58 Class, 80-100 Class)
Remote
Controller
Display
U0
Outdoor Unit LED
Display
A
5
1
1
2
1
3
4
4
4
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 (typical value):
The following conditions continue for 7 minutes.
DC current
≤
0.01 × output fre 0.3
Output frequency > 55 (Hz)
Gas shortage detection II:
The following conditions continue for 80 seconds.
Target opening of the electronic expansion valve
≥
450 (pulse)
Cooling: discharge temperature > 255 / 256 × target discharge tempe20 (°C)
Heating: discharge temperature > 255 / 256 × target discharge tempe40 (°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)
Poor compression performance of compressor
Discharge pipe thermistor disconnected, or indoor unit or outdoor unit heat exchanger
thermistor disconnected, room or outside air temperature thermistor disconnected
Stop valve closed
Electronic expansion valve defective
Summary of Contents for 3MKS50DVM
Page 13: ...Introduction Si12 619A xii ...
Page 131: ...Control Specification Si12 619A 118 Function and Control ...
Page 213: ...Instruction Si12 619A 200 Operation Manual ...
Page 283: ...Check Si12 619A 270 Service Diagnosis ...
Page 302: ...Si12 619A Outdoor Unit E Series 50 52 58 Class Removal Procedure 289 Step Procedure Points ...
Page 385: ...Wiring Diagrams Si12 619A 372 Appendix FTK X S50 60 71FVLT ...
Page 399: ...Si12 619A vi Index ...