Trane CNT2237 Defrost Controller 30067439-890 it is designed for permanent

it is designed for permanent liquid line protection

Designed for standard field installations

ensuring precise electrical switching for refrigeration start relay cycles and HVAC compressor replacement projects

this unit is specifically optimized for three-phase power distribution in Berko and QMark heating systems

Standard HVAC utility thermostats like the A19 series are frequently used in refrigeration for air temperature sensing

Trane CNT2237 Defrost Controller 30067439-890 it is designed for permanentThe Trane CNT2237 Defrost Controller is a high precision OEM electronic board engineered for demand based defrost management in specialized Trane heat pump systems. As a veteran grade HVAC replacement part, this 24V AC controller replaces legacy boards by utilizing advanced adaptive control logic to monitor evaporator coil temperatures. Unlike standard time and temperature units, the CNT2237 uses localized sensor data to initiate the defrost cycle