Functions of Heat Pump Models Si01-40638 Functions and Control2.9 Function of Thermistor2.9.1 Heat Pump ModelA Outdoor HeatExchangerThermistor (DCB)1. The outdoor heat exchanger thermistor is used for high pressure protection during coolingoperation.B Indoor HeatExchangerThermistor (DCN)1. The indoor heat exchanger thermistor is used to prevent freezing.During the cooling operation, if the temperature drops abnormally, the operating frequencybecomes lower, then the operation must be halted.2. The indoor heat exchanger thermistor is used for anti-icing control.During the cooling operation, if the heat exchanger temperature in the room where operationis halted becomes –1°C, it is assumed as icing.Four way valveCompressor (R3070)AB
