Lochinvar & A.O. Smith 100109864 Blower Assembly 320788-704 Focus on maintaining peak system

Focus on maintaining peak system efficiency and reliable cold-weather performance by utilizing this industry-standard combustion relay

This microprocessor-based module is engineered with a 4-second Trial for Ignition (TFI) and operates with 0-second pre-purge

Calibrations are set at the factory to ensure safety integrity

Simplified Installation: Features a high-visibility scale plate for accurate calibration and a universal mounting design that fits standard brackets

Enhanced Durability: Constructed with high-grade metallized polypropylene film to minimize capacitance drift and voltage fluctuations

Lochinvar & A.O. Smith 100109864 Blower Assembly 320788-704 Focus on maintaining peak systemThe 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