Function of Main Structural Parts Si12-30888 Function and Control2.2 Function of Thermistor2.2.1 Heat Pump ModelA Outdoor HeatExchangerThermistor (DCB)1. An outdoor heat exchanger thermistor is used for controlling a target discharge temperature.Set a target discharge temperature depending on an outdoor and indoor heat exchangertemperature.Control the electronic expansion valve opening so that the target discharge temperature canbe obtained.2. An outdoor heat exchanger thermistor is used for detecting a disconnected discharge pipethermistor when cooling.When the temperature of the discharge piping is lower than the temperature of outdoor heatexchanger, a disconnected discharge pipe thermistor can be detected.B DischargePipe Thermistor(DOT)1. Discharge pipe thermistor is used to control a 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 must behalted.2. A discharge pipe thermistor is used for detecting a disconnected discharge pipe thermistor.C Gas PipeThermistor (DGN)1. When cooling: a gas pipe thermistor is used for gas pipe isothermal control.Control electronic expansion valve opening so that a gas pipe temperature in each roombecomes equal.SVD2 Four-way valve1 Compressor3 Solenoid valveEV BEV CEV DEV AReceiver4 Expansion valveABCDE(R2435)
