Lochinvar & A.O. Smith 100093984 Pilot/Thermopile

The Lochinvar & A.O. Smith 100093984 Pilot/Thermopile is a critical OEM replacement assembly engineered for high-recovery natural gas water heaters and commercial boilers. This complete pilot burner assembly includes the pre-installed thermopile generator and pilot tubing, ensuring a precise fit and immediate millivolt signal response to the gas control valve. Designed specifically for Series JC and similar high-demand models, the 100093984 maintains consistent pilot flame stability to prevent nuisance lockouts and voltage drops in commercial heating circuits. The natural gas pilot assembly features a durable 21-inch total length with a 16-11/16 inch gas tube, facilitating proper positioning within the combustion chamber. As a veteran-grade HVAC replacement part, this unit replaces legacy part numbers including 100069935 and 9007882005. Proper installation ensures the thermopile generates the necessary 750mV signal required to hold the safety magnet in the main operator open, maintaining reliable burner ignition cycles under heavy operational loads.

• OEM Compatibility: Exact replacement for Lochinvar, A.O. Smith, and State water heater models, ensuring factory-spec performance.
• Efficient Signal Response: High-output thermopile generator ensures rapid millivolt production for reliable gas valve actuation.
• Corrosion Resistance: Built with high-grade alloys to withstand the intense heat and oxidative environment of the combustion chamber.
• Precision Pilot Tubing: Includes pre-formed pilot tubing and ferrule nut for a leak-free connection to the manifold.
• Reduced Downtime: Plug-and-play assembly streamlines the replacement process for service contractors in the field.

Is this pilot compatible with LP (Propane) systems?
No, the 100093984 is specifically calibrated for natural gas applications. For propane units, verify the specific orifice and assembly requirements for liquid petroleum.

Does this assembly include the ferrule and nut?
Yes, this kit typically includes the necessary ferrule nut for securing the 1/4-inch or 3/16-inch pilot line to the gas control valve.

What causes a thermopile to fail in these commercial units?
Common failure points include heavy carbon deposits, flame impingement issues, or internal resistance buildup due to high-heat cycles over time, resulting in insufficient millivolt output.

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.