SiUS091601EA Control SpecificationPart 4 Functions and Control 905.11.8 Target Discharge Pipe Temperature ControlThe target discharge pipe temperature is obtained from the indoor and outdoor heat exchangertemperature, and the electronic expansion valve opening is adjusted so that the actual dischargepipe temperature becomes close to the target discharge pipe temperature. (Indirect SH(superheating) control using the discharge pipe temperature)The electronic expansion valve opening and the target discharge pipe temperature are adjustedevery A seconds. The opening degree of the electronic expansion valve is adjusted by thefollowing. Target discharge pipe temperature Actual discharge pipe temperature Previous discharge pipe temperature The time depends on the opening of the electronic expansion valve.5.12 Malfunctions5.12.1 Sensor Malfunction DetectionSensor malfunction can be detected in the following thermistor:1. Outdoor heat exchanger thermistor2. Discharge pipe thermistor3. Radiation fin thermistor4. Outdoor temperature thermistor5.12.2 Detection of Overcurrent and OverloadOutline An excessive output current is detected and the OL temperature is observed to protect thecompressor.Details If the OL (compressor head) temperature exceeds 120 ~ 130°C (248 ~ 266°F) (depending onthe model), the system shuts down the compressor. If the inverter current exceeds 12.0 ~ 20.0 A (depending on the model), the system shuts downthe compressor.The upper limit of the current decreases when the outdoor temperature exceeds a certain level.09/12/15 class 18/24 classA (seconds) 10 ~ 30 20SC(Subcooling)SH(Superheating)The target discharge pipetemperature is set as to becomethe target SH.The inclination does not changedepending on the operating condition.(R23014)
