Control Specification SiBE041011EC51 Function and Control3.12 Malfunctions3.12.1 Sensor Malfunction DetectionSensor malfunction can be detected in the following thermistors:1. Outdoor heat exchanger thermistor2. Discharge pipe thermistor3. Radiation fin thermistor4. Outdoor temperature thermistor3.12.2 Detection of Overcurrent and OverloadOutline An excessive output current is detected and the OL temperature is observed to protect thecompressor.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 DetectionIf the power consumption is below the specified value and the frequency is higher than thespecified frequency, it is regarded as refrigerant shortage.The power consumption is low comparing with that in the normal operation when refrigerant isinsufficient, and refrigerant shortage is detected by checking power consumption.Refer to page 68 for detail.FrequencyRefrigerant shortage zone(R18282)40 ~ 55 Hz(depending onthe model)Power consumption(Input current)
