Lochinvar & A.O. Smith 100110278 Gas Valve

The Lochinvar & A.O. Smith 100110278 Gas Valve is an essential OEM replacement component designed for high-efficiency residential and commercial water heating systems. Engineered for precision, this 120V natural gas valve features a 1/2-inch NPT connection and is factory-calibrated to a 4" water column (WC) manifold pressure. Built for reliability in demanding HVACR applications, it integrates Intellivent technology to provide accurate thermostatic control and safe pilot lighting. As a veteran technician knows, maintaining the correct manifold gas pressure is critical for optimal combustion and preventing ignition lockout or flame failure, and this genuine 100110278 control valve ensures your Lochinvar or A.O. Smith boiler or water heater operates within manufacturer specifications. Whether you are troubleshooting a hot water heater control box or performing a full system overhaul, this valve offers a 100% gas shutoff safety feature if the pilot fails, making it the professional choice for HVAC repair parts.

• Precision Calibration: Factory-set to 4" WC for natural gas, ensuring proper burner input and high-performance efficiency.
• Intelligent Control: Compatible with White Rodgers Intellivent systems for advanced diagnostic feedback and temperature regulation.
• Enhanced Safety: Features a 100% gas shutoff mechanism and safe lighting protocols to prevent main gas flow during pilot ignition.
• Seamless Fit: Direct OEM replacement for part 100110278 and 184768-002, featuring a standard 1/2" gas inlet and a 2.25" shank.

What are the signs that a gas valve needs replacement?
Contractors often identify a failing 100110278 valve by an ignition fault or flame failure code on the control board. If you verify 120V power to the valve but the negative gas pressure does not rise toward zero during the ignition cycle, the internal solenoid has likely failed.

Is this valve compatible with LP (Propane) systems?
No, this specific model is calibrated for Natural Gas (NAT) at a 4" WC setting. Installing this on a propane system without a verified conversion kit can lead to hazardous combustion conditions. Use only the gas type specified on your equipment rating plate.

Can I adjust the manifold pressure on this valve?
While the valve includes a manifold gas pressure tap for testing with a manometer, the pressure regulator is factory-set. Technicians should verify supply pressure before attempting any field adjustments to ensure the system meets Lochinvar technical requirements.

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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.