Supco ML90 Defrost Thermostat Refrigeration

Product Description

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 rating.

Installation Notes

Installation is typically performed by a licensed appliance technician or refrigeration service professional. Disconnect power to the appliance before accessing the evaporator compartment or handling any electrical components. The thermostat must be mounted securely to the evaporator coil or fin assembly per the original equipment configuration to ensure accurate temperature sensing. Do not energize the defrost circuit without confirming all wiring connections are secure and the thermostat is properly seated.