Lochinvar & A.O. Smith 100135312 Burner

The Lochinvar & A.O. Smith 100135312 Burner is a critical OEM replacement part designed for high-efficiency combustion in commercial heating applications. This main burner assembly, which is technically identical to the Lochinvar BNR3430, features an integrated pressure tap to allow for precise manifold pressure adjustments and diagnostic testing. It is engineered specifically for use in Copper-Fin II series equipment, including model CP 991 to 2071 commercial pool heaters and compatible boilers. By maintaining the correct air-gas mixture, this burner ensures stable flame patterns and optimal heat transfer, preventing the common issues of incomplete combustion or soot buildup that can lead to premature heat exchanger failure.

For technicians servicing large-scale hydronic systems, the 100135312 burner provides the exact physical dimensions (approximately 23.2 inches in length) and port configuration required for a drop-in HVAC replacement. This assembly is standard for units manufactured beginning with serial number E05H00176040. Utilizing genuine Lochinvar parts like this burner assembly preserves the intended combustion efficiency of the system and ensures seamless alignment with existing gas train components and orifices.

• Precise Diagnostics: Built-in pressure tap enables accurate measurement of manifold gas pressure during startup and commissioning.
• Exact Compatibility: Direct replacement for BNR3430, ensuring zero-clearance issues within the burner tray of Copper-Fin II models.
• Enhanced Combustion: Engineered port design promotes a stable, uniform flame for maximized thermal efficiency and reduced emissions.
• Durable Construction: High-grade materials resist oxidative stress and thermal fatigue in demanding commercial environments.

Is the 100135312 interchangeable with the BNR3430?
Yes, these two part numbers refer to the same main burner assembly. The 100135312 is the current manufacturer part number used by Lochinvar and A.O. Smith, replacing older designations while maintaining identical technical specifications.

Which models are compatible with this burner?
This burner is primarily designed for the Lochinvar Copper-Fin II line, specifically models CP 991, 1261, 1441, 1801, and 2071. Always verify the unit's serial number, as burner configurations may change for units built prior to mid-2005.

Does this assembly include the burner gasket?
This specific part is the burner assembly with pressure tap. It is highly recommended to inspect and replace the burner gasket (such as 100208085 or 100233594 depending on the model) during installation to ensure a gas-tight seal.

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.