Lochinvar & A.O. Smith 100093721 Valve

The Lochinvar & A.O. Smith 100093721 Valve is a 3.5" natural gas control valve engineered for precision fuel regulation in high-efficiency commercial boilers and water heaters. Designed to meet the demands of condensing heating systems, this direct replacement gas valve ensures accurate manifold pressure and consistent ignition cycles. As a critical OEM HVACR component, it works in tandem with the blower assembly to maintain the correct air-to-fuel ratio, preventing flame failure and ignition faults in Lochinvar Knight and A.O. Smith Armor models. Constructed with a heavy-duty metal alloy, the 100093721 gas valve is built to handle the high-pressure applications and thermal stresses common in 24/7 mechanical rooms. Replacing a compromised valve with this genuine Lochinvar part restores peak combustion efficiency, reduces nitrogen oxide emissions, and maintains the safety integrity of the burner assembly by preventing unauthorized gas migration during the off-cycle.

• Precise Fuel Regulation: Maintains stable natural gas flow to ensure optimal burner performance and energy efficiency.
• OEM Compatibility: Guaranteed fit for specific A.O. Smith and Lochinvar heating units, eliminating the risks associated with universal after-market parts.
• High-Pressure Tolerance: Specially designed to operate safely within the demanding pressure parameters of commercial-grade hydronic systems.
• Enhanced Safety Controls: Features integrated shut-off mechanisms to prevent gas leaks and ensure reliable flame stabilization.
• Durable Construction: Built with corrosion-resistant materials to extend the service life of the valve under continuous operation.

How do I know if the 100093721 valve is failing?
Technicians often observe ignition lockout codes, such as "Flame Failure" or "Ignition Failure." If you have confirmed a healthy spark and proper voltage at the harness but see no rise in gas pressure on your manometer, the solenoid or internal diaphragm has likely failed.

Is this valve compatible with Propane (LP) systems?
No, this is a dedicated natural gas valve. For LP configurations, a specific conversion kit or a different valve model is required to account for the higher energy density and pressure requirements of liquid propane.

Does this part require calibration after installation?
Yes, per manufacturer service manuals, the gas valve adjustment procedure should be performed using a calibrated combustion analyzer to check CO2 and O2 levels, ensuring the unit operates within factory-specified modulation ranges.

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.