System Stability: Mitigates erratic burner firing and short-cycling by providing consistent

the valve maintains a maximum working pressure of 500 psig and a Maximum Operating Pressure Differential (MOPD) of 300 psig

preventing nuisance trips often associated with inferior aftermarket alternatives

meaning it completes the 24V circuit only when the required vacuum threshold is reached

Rated for a maximum working pressure of 125 PSI

Williams 9940 Converter 321702-401 System Stability: Mitigates erratic burnerThe Williams 9940 Hard Wire Converter is a critical component for integrating modern electronic thermostats with older 24V furnace systems that lack a dedicated C wire. This HVAC power interface converts 115V line voltage into the 24V supply necessary to power digital controls, ensuring stable operation without battery drain. Designed specifically for compatibility with Williams furnace models and wall heaters, this 10VA rated converter facilitates a