Supco Defrost Thermostats

Overview

The SUPCO ML90 is a defrost thermostat rated to open at 90 degrees F, designed to monitor evaporator coil temperature during the defrost cycle. When the coil reaches the preset cutout temperature, the thermostat opens the circuit, stopping the defrost heater and preventing excessive heat buildup on the evaporator. This protects refrigeration components and supports efficient frost removal. It is a direct-replacement control component typically installed by appliance technicians and refrigeration service pros working on domestic and light-commercial refrigeration equipment. The ML90 is used in refrigeration systems where automatic defrost cycles are required. It mounts on or near the evaporator coil and operates as part of the defrost control circuit, working alongside the defrost timer or adaptive defrost control board and the defrost heater. Proper frost removal enabled by this thermostat helps maintain consistent evaporator airflow and steady cooling output over the service life of the appliance. Key Features Opens circuit at 90 degrees F to terminate the defrost cycle at the correct coil temperature Protects evaporator coil and surrounding components from excessive defrost heat Functions as part of the defrost control circuit alongside the timer and heater Direct-replacement format suited for field service and appliance repair Compatibility Designed as an OEM-style replacement defrost thermostat for refrigeration equipment requiring a 90 degrees F cutout temperature…