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Control Specification
Si12-619A
112
Function and Control
3.13 Malfunctions
3.13.1
Sensor Malfunction Detection
Sensor malfunction may occur either in the thermistor or current transformer (CT) system.
Relating to Thermistor Malfunction
1. Outdoor heat exchanger thermistor
2. Discharge pipe thermistor
3. Fin thermistor
4. Gas pipe thermistor
5. Outdoor air temperature thermistor
6. Liquid pipe thermistor
Relating to CT Malfunction
When the output frequency is more than 55 Hz (model by model) and the input current is less
than 1.25A, carry out abnormal adjustment.
3.13.2 Detection of
Overload
and
Over Current
Outline
In order to protect the inverter, detect an excessive output current, and for protecting
compressor, monitor the OL operation.
Detail
If the OL (compressor head) temperature exceeds 130°C (120°C for 2YC36), the
compressor gets interrupted.
If the inverter current exceeds 30 A, the compressor gets interrupted too.
3.13.3
Insufficient Gas Control
Outline
I Detecting by power consumption
If the power consumption is below the specified value and the frequency is higher than the
specified frequency, it is regarded as insufficient gas.
The power consumption is weak comparing with that in the normal operation when gas is
insufficient, and gas insufficiency is detected by checking a power consumption.
II Detecting by discharge pipe temperature
If the discharge temperature is higher than the target discharge pipe temperature, and the
electronic expansion valve is fully open (450 pulses) more than the specified time, it is regarded
as insufficient gas.
Refer to “Insufficient Gas” on page 253 for detail.
Frequency
Power consumption
Insufficient gas zone
55 Hz
(R2834)
Gas insufficient
zone
(R1391)
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 ...