Function of Main Structural Parts SiBE12-71378 Function and Control2.2 Function of Thermistor2.2.1 Heat Pump ModelA Outdoor HeatExchangerThermistor1. The 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.2. The outdoor heat exchanger thermistor is used for detecting disconnection of the dischargethermistor when cooling.When the discharge pipe temperature becomes lower than the outdoor heat exchangertemperature, the discharge pipe thermistor is judged as disconnected.B DischargePipe Thermistor1. The 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.2. The discharge pipe thermistor is used for detecting disconnection of the dischargethermistor.C Gas PipeThermistor1. In cooling, the gas pipe thermistors are used for gas pipe isothermal control.The system controls electronic expansion valve opening so that gas pipe temperature ineach room becomes equal.Four way valveCompressorEV BEV CEV DEV AExpansion valveABCDE(R5067)
