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This evaporator limit control acts as a safety switch that opens the electrical circuit at 35°F to stop cooling and closes it at 58°F to resume operation
If your original hardware is missing
optimizing flue gas velocity and pressure switch performance
Robust Industrial Design: Engineered to withstand the thermal cycling typical of low ambient applications and evaporator line mounting
Direct OEM Compatibility: Specifically designed to replace obsolete part numbers 668770 and 669937R
Williams P254000 Thermocouple This evaporator limit control actsThe Williams P254000 Thermocouple is a high performance flame sensing replacement designed specifically for Williams gas fired furnaces and wall heaters. As a critical safety component, this thermocouple lead generates the necessary millivoltage to hold the gas valve open during operation. Engineered for high temperature environments, the P254000 provides stable pilot flame sensing to prevent hazardous unburned gas buildup. This HVAC replacement part
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