Haier HSU24VHJ(DB) Service Manual

Also see for HSU24VHJ: Installation manual Service manual

HSU24VHJ˄DB˅ Funcitions and ControlDomestic Air Conditioner265.3 Function of Main ThermistorNote: A:Outdoor suction temperature sensorB: Exhaust temperature sensorC: Indoor heat-exchange sensorOutdoor Suction Temperature SensorThe outdoor heat exchanger thermistor is used for controlling target discharge temperature.The system sets a target discharge temperature according to the outdoor and indoor heatexchanger temperature, and controls the electronic expansion valve opening so that thetarget discharge temperature can be obtained.Exhaust Temperature SensorThe discharge pipe thermistor is used for controlling temperature of the discharge pipe.If the temperature of discharge pipe (used in place of the inner temperature of thecompressor) rises abnormally, the operating frequency drops or the operation halts.Indoor heat-exchange sensor1.The indoor heat exchanger thermistor is used for controlling target discharge temperature.The system sets a target discharge temperature according to the outdoor and indoor heatexchanger temperature, and controls the electronic expansion valve opening so that thetarget discharge temperature can be obtained.2.The indoor heat exchanger thermistor is used for preventing freezing.During the cooling operation, ifthe temperature drops abnormally, the operating frequency becomes lower, then the operation halts.3.The indoor heat exchanger thermistor is used for anti-icing control.During the cooling operation, ifthe heat exchanger temperature in the room where operation is halted becomes -1°C, it is assumedas icing.