Lochinvar & A.O. Smith 100109740 Gas Valve

The 100109740 gas control valve is a critical direct replacement component designed for compatibility with high-efficiency Lochinvar Knight and A.O. Smith condensing boilers. This precise negative pressure gas valve manages the fuel-to-air ratio, ensuring efficient combustion across varying modulation rates. Engineered for natural gas (NG) applications, this valve features a reliable solenoid actuator and a finely tuned internal regulator to maintain stable manifold pressure. For field technicians, this part is essential for resolving ignition failure codes or pressure fluctuations in commercial water heating systems. The robust housing and electrical connectors are built to withstand the thermal cycles common in high-BTU hydronic applications. Proper installation requires a combustion analyzer to verify CO2 levels and ensure the venturi assembly is pressurized correctly for safe operation.

• Specifically calibrated for Lochinvar Knight KBN and A.O. Smith WHN series boilers.
• Ensures accurate gas-to-air mixture for peak thermal efficiency and low emissions.
• Reduces nuisance lockouts and flame rectification errors in high-demand systems.
• Rugged construction designed for high-efficiency condensing environments.

Is the 100109740 compatible with propane (LP) units?
This specific part is configured for natural gas; however, it can often be converted using a manufacturer-approved LP conversion orifice kit. Always verify the current equipment model string before installing.

What are the symptoms of a failing 100109740 valve?
Common indicators include repeated ignition failures, unstable flame signals during low-fire modulation, or the smell of gas near the blower assembly. Professional diagnostic testing of the solenoid coils is recommended.

Does this valve come with a new flange gasket?
Standard field procedure dictates replacing gaskets during any gas train service to prevent leaks; ensure you have the correct Viton O-rings or interface gaskets required for your specific manifold configuration.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.