and Evcon families

It is critical to verify if your specific heater build uses the 5K (Black leads) or 10K (Red leads) thermistor to ensure the logic matches the resistance curve for accurate setpoints

Designed as an OEM replacement motor

You must pair it with a compatible Danfoss solenoid coil (such as a 120V or 24V AC/DC clip-on version) based on your system's electrical requirements

there is no difference in specifications or build

Williams P500420 Gas Valve 319825-402 and Evcon familiesAs a seasoned tech, you know that maintaining precise manifold pressure is non negotiable for system safety and combustion efficiency. The Williams P500420 Gas Valve is an OEM replacement gas valve engineered specifically for Williams Comfort Products heating systems. This 10. 5" WC LP gas valve is factory calibrated for liquid propane (LP) applications, ensuring the correct fuel to air ratio for high output furnace gas valve performance. Whether you