Lochinvar & A.O. Smith 100109864 Blower Assembly

The Lochinvar & A.O. Smith 100109864 Blower Assembly is a direct OEM replacement engineered for high-efficiency commercial water heaters and boilers. Designed to maintain precise air-fuel ratios, this combustion blower motor ensures stable flame signals and optimal thermal output. As a critical component in the pre-mix combustion system, it integrates seamlessly with the control board to modulate airflow based on demand, preventing short cycling and reducing nitrogen oxide emissions. Technical specifications include a high-RPM brushless motor housing designed for durability in high-heat environments. This fan assembly is compatible with various Lochinvar Knight and A.O. Smith Cyclone series, including models like the BTH-120 through BTH-250. When installing this 100109864 blower, ensure the gasket seal is seated correctly to prevent combustion gas leakage and maintain proper static pressure within the heat exchanger. This assembly provides a reliable fix for F9 or fan speed errors often encountered in the field.

Key Benefits

• OEM Compatibility: Precision-engineered for a drop-in fit for Lochinvar and A.O. Smith commercial units, ensuring no field modifications are required.
• Enhanced Modulation: Supports variable speed operation for precise combustion air control across different firing rates.
• Industrial Build Quality: Features a reinforced housing and heavy-duty bearings to withstand continuous operation in commercial boiler rooms.
• Optimized Performance: Engineered to meet exact CFM requirements, preventing common ignition failures and pressure switch trips.

Common Questions

What are the signs that a 100109864 blower needs replacement?
Contractors typically identify a failing blower through excessive bearing noise, an inability to reach target RPMs, or frequency drive errors on the unit’s digital display. If the pressure switch fails to close during the pre-purge cycle, the blower is often the primary suspect.

Is the mounting gasket included with this assembly?
While this is the blower motor assembly, it is industry standard to inspect and replace the mounting gasket during installation to ensure a gas-tight seal on the combustion plenum.

Will this blower work with both Natural Gas and Propane units?
Yes, the blower manages the air volume for the pre-mix burner. The specific gas type is handled by the gas valve and orifice, making this blower compatible with either configuration as long as the model number matches the manufacturer's parts list.

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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.