Thermistor Functions SiUS091601E39 Functions and Control2. Thermistor Functions(1) Outdoor HeatExchangerThermistor1. The outdoor heat exchanger thermistor is used for controlling the 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 thedisconnection of the discharge pipe thermistor. When the discharge pipe temperature dropsbelow the outdoor heat exchanger temperature by more than a certain value, the discharge pipethermistor 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 the 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 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 thedisconnection of the discharge pipe thermistor. When the discharge pipe temperature dropsbelow the indoor heat exchanger temperature by more than a certain value, the discharge pipethermistor is judged as disconnected.Four way valveCompressor (R14247)(3)(2)Electronicexpansion valve(1)
