Lochinvar & A.O. Smith 100173793 Arm Assembly

The Lochinvar & A.O. Smith 100173793 Arm Assembly is a critical OEM replacement part engineered for high-efficiency commercial boilers and heating systems. As a veteran-grade gas/air arm assembly, this component ensures the precise mechanical alignment necessary for optimal combustion and fluid regulation. Specifically designed for compatibility with Lochinvar Knight series models (including KBN, AWN, and SNA 500), this assembly facilitates the correct mixture of air and fuel to maintain peak thermal efficiency. Technicians frequently utilize the 100173793 to replace the obsolete WTR3079, restoring factory-spec performance to hydronic heating systems. Constructed with industrial-grade materials to withstand the rigorous cycling of modern condensing boilers, it acts as a primary mounting and support structure for the blower and burner interface. Ensuring a leak-free seal and exact spatial orientation, this genuine Lochinvar part helps prevent premature wear on downstream components and stabilizes the operational integrity of A.O. Smith water heaters and boiler units.

• Direct OEM Match: Provides a precise fit for Lochinvar KBN, AWN, and SNA 500 models, as well as select A.O. Smith units, replacing obsolete part number WTR3079.
• Optimized Combustion: Stabilizes the gas/air arm assembly kit to ensure proper fuel delivery and airflow for high-efficiency burner performance.
• Industrial Durability: Engineered to hold tight tolerances under high thermal stress, reducing vibration and mechanical fatigue in commercial heating systems.
• Simplified Integration: Designed for standard field installation, aligning perfectly with existing blower and manifold configurations.

Which boiler models are compatible with the Lochinvar 100173793?
This arm assembly is primarily used in 500 series models including the KBN501, AWN501, SNA501, and SWA500N. Always verify your specific model and serial number before local installation.

Is the 100173793 a direct replacement for the WTR3079?
Yes, the 100173793 is the current manufacturer-authorized replacement for the discontinued WTR3079 arm assembly.

Does this assembly include required gaskets?
Most gas/air arm assembly kits include the necessary gaskets for a secure, airtight seal, which is vital for maintaining the internal pressure ratios of high-efficiency boilers.

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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.