Control Specification SiBE06112143 Function and Control3.12 Malfunctions3.12.1 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, the system shuts down thecompressor. If the inverter current exceeds 9.25 ~ 20 A (depending on the model), the system shuts downthe compressor.3.12.2 Refrigerant Shortage ControlOutline I: Detecting by power consumptionIf 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.II: Detecting by discharge pipe temperatureIf the discharge pipe temperature is higher than the target discharge pipe temperature, and theoutdoor electronic expansion valve is fully open for more than the specified time, it is regardedas refrigerant shortage.III: Detecting by the difference of temperatureIf the difference between suction and discharge temperature is smaller than the specified value,it is regarded as refrigerant shortage.Refer to page 115 for detail.FrequencyPower consumption Refrigerant shortage zone(R14621)55 Hz(R1391)Target dischargepipe temperatureRefrigerant shortagezone