Lochinvar & A.O. Smith 100093812 Door Assembly

The Lochinvar & A.O. Smith 100093812 Door Assembly is a direct OEM replacement engineered for high-recovery natural gas water heaters, specifically the FG50T40 and compatible commercial water heater models. This manifold door assembly serves as a critical pressure-sealed interface, housing the pilot assembly and facilitating precise gas burner ignition. Designed for professional-grade reliability, the assembly integrates a thermal switch (door switch) and high-temp gasket sealing to maintain the integrity of the combustion chamber while ensuring optimal BTU output and Venting efficiency.

For technicians performing water heater repair, this kit simplifies the restoration of reliable pilot light operation and burner sequencing. The rugged construction is built to withstand the high-temperature environments of industrial and heavy-duty residential applications, where consistent combustion performance is non-negotiable. By replacing the entire manifold door assembly with pilot, contractors ensure a factory-spec seal, reducing the risk of nuisance lockouts and ensuring the safety of the HVAC system ignition cycle.

• Direct OEM Fit: Ensures precise alignment with the burner tube and combustion chamber intake for Lochinvar and A.O. Smith units.
• Integrated Pilot System: Includes the pilot assembly and door switch for a comprehensive ignition system refresh.
• Enhanced Sealing: High-grade gasket materials provide a secure enclosure, preventing unwanted air infiltration into the burner box.
• Technical Reliability: Optimized for Natural Gas configurations, maintaining steady flame rectification and ignition safety.

• Which models is the 100093812 compatible with? It is specifically designed for A.O. Smith and Lochinvar FG50T40 series and related high-recovery natural gas models.
• Does this kit include the gasket? Yes, the manifold door assembly includes the necessary sealing components to ensure a safe, airtight combustion seal.
• Can this be used for Propane (LP) units? No, this specific part number is calibrated and jetted for Natural Gas applications only.

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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.