Lochinvar & A.O. Smith 100109891 Gas Valve 321894-706 Common Questions & Answers Is

Common Questions & Answers Is this board a direct replacement for the S1-331-09171-000

Precise Level Control: Integrated serrated arms facilitate easy indexed adjustments to ensure accurate water levels and prevent overflow

leak-free integration into copper piping systems

Can this damper be used for A2L refrigerant compliance

If the 24V HVAC signal is present at the valve terminals but no gas flow is detected at the outlet (checked via manometer)

Lochinvar & A.O. Smith 100109891 Gas Valve 321894-706 Common Questions & Answers IsThe Lochinvar & A. O. Smith 100109891 Gas Valve is a critical OEM replacement part designed for high recovery commercial water heaters and boilers. Engineered for precision, this 24V natural gas valve operates with a 3. 5" WC manifold pressure to ensure stable combustion and optimal thermal efficiency. Built with a rugged 3 4" NPT connection, it is a direct substitute for legacy part numbers such as 9004497205 and 192015, providing a reliable solution