Function of Thermistor SiUS04111132 Function and Control2. Function of Thermistor(1) Outdoor HeatExchangerThermistor1. The outdoor heat exchanger thermistor is used for controlling target discharge pipetemperature. The system sets the target discharge pipe temperature according to the outdoorand indoor heat exchanger temperature, and controls the electronic expansion valve opening sothat the target discharge pipe temperature can be obtained.2. In cooling operation, the outdoor heat exchanger thermistor is used for detecting disconnectionof the discharge pipe thermistor. When the discharge pipe temperature becomes lower than theoutdoor heat exchanger temperature, the discharge pipe thermistor is judged as disconnected.3. In cooling operation, the outdoor heat exchanger thermistor is used for high pressure protection.(2) DischargePipe Thermistor1. The discharge pipe thermistor is used for controlling discharge pipe temperature. If thedischarge pipe temperature (used in place of the inner temperature of the compressor) risesabnormally, the operating frequency becomes lower or the operation halts.2. The discharge pipe thermistor is used for detecting disconnection of the discharge pipethermistor.(3) Indoor HeatExchangerThermistor1. The indoor heat exchanger thermistor is used for controlling target discharge pipe temperature.The system sets the target discharge pipe temperature according to the outdoor and indoorheat exchanger temperature, and controls the electronic expansion valve opening so that thetarget discharge pipe temperature can be obtained.2. In cooling operation, the indoor heat exchanger thermistor is used for freeze-up protectioncontrol. If the indoor heat exchanger temperature drops abnormally, the operating frequencybecomes lower or the operation halts.3. In heating operation, the indoor heat exchanger thermistor is used for detecting disconnection ofthe discharge pipe thermistor. When the discharge pipe temperature becomes lower than theindoor heat exchanger temperature, the discharge pipe thermistor is judged as disconnected.RKN09/12KEVJU RKN15/18/24KEVJURXN09/12/15/18/24KEVJU(3)(1)(2) Compressor (R14721)Electronicexpansion valveFour-way valveCompressor (R14247)(3)(2)Electronicexpansion valve(1)
