Lochinvar & A.O. Smith 100109078 Blower Assembly

The Lochinvar & A.O. Smith 100109078 Blower Assembly is a direct replacement combustion blower designed for high-efficiency water heaters and boilers. This OEM blower motor is engineered for precise air-to-fuel ratio control, ensuring optimal combustion stability in units like the Lochinvar Knight and A.O. Smith Cyclone series. Built with a high-torque motor and balanced impeller, it effectively moves flue gases through the heat exchanger while maintaining low static pressure drops. As a critical HVAC replacement part, it addresses common failure points such as bearing drag or motor winding burnout, restoring the AFUE rating of the appliance. Contractors should verify the 100109078 part number against the existing datasheet to ensure exact fitment for the integrated pre-mix burner system. This assembly includes the blower housing and motor, providing a streamlined installation process for field technicians requiring reliable gas-fired furnace repair components.

Technical Benefits

• Direct OEM Compatibility: Engineered specifically for Lochinvar and A.O. Smith commercial and residential models for a precise combustion fan interface.
• Enhanced Durability: Robust construction designed to withstand high-cycle operation in demanding condensing boiler environments.
• Optimized Airflow: Precision-balanced components minimize vibration, extending the service life of the induced draft motor and related seals.
• Efficient Performance: Maintains consistent venting pressure to ensure safe and clean ignition cycles under varying load conditions.

Common Technical Questions

What are the signs that a 100109078 blower assembly needs replacement?
Technicians typically look for error codes related to APS (Air Pressure Switch) transitions, excessive mechanical noise, or a failure to reach the required RPM for pre-purge cycles.

Does this assembly include the necessary mounting gaskets?
While the assembly consists of the motor and housing, it is standard practice to inspect and replace the flange gaskets during installation to prevent combustion gas leakage.

Is this blower compatible with both natural gas and propane configurations?
Yes, because the blower manages air delivery to the mixing venturi, it is compatible with both fuel types, provided the burner orifice and gas valve are properly calibrated.

This item is not eligible for free shipping.

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.