Lochinvar & A.O. Smith 100111651 Burner Assembly

The Lochinvar & A.O. Smith 100111651 Burner Assembly is a factory-authorized replacement component designed for Natural Gas (NG) high-efficiency commercial boilers and water heaters. Engineered with a #31 orifice, this assembly ensures precise fuel-to-air mixing and stable combustion across varying load demands. This OEM burner assembly is utilized in the Lochinvar Knight and A.O. Smith Cyclone series, specifically addressing combustion stability and nitrogen oxide reduction. As a direct-fit replacement part, it restores thermal efficiency by maintaining the design-specific flame pattern required for the heat exchanger. For contractors performing a Lochinvar 100111651 installation, verifying the integrity of the burner gasket and ensuring proper manifold pressure is essential for optimal burner plate performance. This assembly replaces legacy part numbers BNR3412 and 100111651, providing a rugged solution for high-cycle commercial applications where reliable ignition and flame rectification are critical for system uptime.

• OEM Precision: Direct replacement ensures mechanical compatibility with Lochinvar and A.O. Smith combustion chambers without field modifications.
• Calibrated Orifice: Includes a factory-set #31 NAT orifice to maintain correct BTU output and gas velocity.
• Industrial Durability: Constructed with high-grade alloys to resist thermal stress and warping under continuous operational temperatures.
• Simplified Maintenance: Designed for rapid installation to minimize downtime during emergency boiler repairs.

What are the signs that a 100111651 burner assembly needs replacement?
Technicians should look for warped burner plates, cracked ceramic inserts, or persistent flame sensing issues (soft lockouts) that cannot be resolved with electrode cleaning. Uneven flame patterns or carbon buildup often indicate that the internal structure of the burner has degraded.

Is this burner compatible with LP gas applications?
No, the 100111651 is specifically configured with a #31 orifice for Natural Gas. Using this assembly in a Propane (LP) system without the proper conversion kit will lead to hazardous combustion conditions and potential equipment damage.

Are the mounting gaskets included with the burner?
Typically, the gaskets are sold separately or as part of a comprehensive tune-up kit. It is standard practice to replace the burner gasket whenever the assembly is removed to ensure a gas-tight seal and prevent CO leaks.

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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.