Lochinvar & A.O. Smith 100109785 Outline Boxed

The Lochinvar & A.O. Smith 100109785 blower assembly is a precision-engineered motor and housing component designed for high-efficiency commercial water heaters and boilers. This OEM replacement blower ensures optimal air-fuel ratios and reliable combustion venting for demanding hydronic systems. Built for durability, the assembly features a high-rpm motor and balanced impeller to minimize vibration and bearing wear under continuous duty cycles. It serves as a direct replacement for legacy part numbers such as Lochinvar 100109785 and A.O. Smith 100109785, maintaining factory-specified static pressure levels. When troubleshooting short-cycling or ignition failures, technicians should verify the inductor motor amperage draw against plate ratings. Integrating this 100109785 draft inducer restores peak thermal efficiency and prevents diagnostic error codes related to airflow restriction. This unit is specifically calibrated for compatibility with various Lochinvar Knight and A.O. Smith Cyclone models where precise forced draft performance is required.

• Direct OEM Fitment: Ensures seamless integration with existing control boards and gas valves without modification.
• High-Temperature Construction: Designed to withstand the intense thermal environments typical of sealed-combustion commercial units.
• Optimized Airflow: Maintains the necessary static pressure for consistent burner performance and heat exchanger longevity.
• Reduced Noise Signature: Precision-balanced components reduce harmonic resonance through the cabinetry.

Common Technical Questions

What are the symptoms of a failing blower assembly?
Common indicators include localized grinding noises, increased vibration, or the boiler failing to clear the pre-purge cycle due to an open pressure switch circuit.

Is the 100109785 interchangeable with generic blowers?
No. To maintain agency listings and combustion safety, the 100109785 motor must be used as specified by the equipment manufacturer to ensure correct CFM and RPM parameters.

Does this assembly include the primary gasket?
It is standard practice to inspect and replace the mounting gasket during installation to prevent flue gas leakage, though technicians should confirm existing flange integrity before seating the new unit.

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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.