Lochinvar & A.O. Smith 100108828 Gas Valve

The Lochinvar & A.O. Smith 100108828 Gas Valve is a critical replacement component engineered for high-efficiency hydronic boilers and commercial water heaters. This 120V gas valve operates with a 1/2 inch NPT inlet/outlet configuration and is factory-calibrated for natural gas applications at a 4.0" W.C. manifold pressure. Designed to integrate seamlessly with Lochinvar Knight and A.O. Smith Cyclone series units, this valve ensures precise gas flow regulation and reliable ignition control. As a direct OEM replacement part, it addresses common HVAC flame rectification issues and pressure drops that can lead to system lockouts. The robust solenoid design maintains consistent combustion efficiency, even during high-demand cycles. Professionals should verify the orifice size and use a calibrated manometer during installation to ensure proper combustion analysis and manifold pressure settings meet the original equipment manufacturer’s specifications.

• Direct OEM Compatibility: Specifically designed for Lochinvar Knight and A.O. Smith Cyclone models to ensure exact fitment.
• Precise Pressure Management: Pre-set to 4" W.C. natural gas for optimal thermal efficiency.
• Heavy-Duty Solenoid: Built for high-cycle commercial use, preventing gas valve sticking or failure.
• Standard NPT Ports: Features 1/2" gas connections for straightforward installation into existing gas trains.

Common Questions

How do I troubleshoot a 100108828 valve that won't open?
Verify that the control board is sending a full 120V signal to the solenoid coil. If voltage is present but the valve fails to release gas, check for internal diaphragm failure or debris within the gas train.

Can this gas valve be converted to Liquid Propane (LP)?
This specific model is calibrated for Natural Gas. Conversion requires a certified LP conversion kit and adjustment of the spring regulator to match the required manifold pressure specified on the unit's rating plate.

What are the symptoms of a failing boiler gas valve?
Contractors typically report intermittent ignition, "No Flame" error codes, or delayed ignition. Always perform a drop test and gas pressure test at both the inlet and outlet ports to confirm mechanical failure.

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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.