Control Specification SiBE041029EC
45 Function and Control
3.12 Malfunctions
3.12.1 Sensor Malfunction Detection
Sensor malfunction can be detected in the following thermistors:
1. Outdoor heat exchanger thermistor
2. Discharge pipe thermistor
3. Radiation fin thermistor
4. Outdoor temperature thermistor
3.12.2 Detection of Overcurrent and Overload
Outline An excessive output current is detected and the OL temperature is observed to protect the
compressor.
Detail
If the OL (compressor head) temperature exceeds 120 ~ 130°C (depending on the model),
the system shuts down the compressor.
If the inverter current exceeds 20 A, the system shuts down the compressor.
3.12.3 Refrigerant Shortage Detection
If the power consumption is below the specified value and the frequency is higher than the
specified frequency, it is regarded as refrigerant shortage.
The power consumption is low comparing with that in the normal operation when refrigerant is
insufficient, and refrigerant shortage is detected by checking power consumption.
Refer to page 62 for detail.
Frequency
Refrigerant shortage zone
(R18282)
40 ~ 55 Hz
(depending on
the model)
Power consumption
(Input current)
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