Lochinvar & A.O. Smith 100109674 Control Valve

The Lochinvar & A.O. Smith 100109674 is a direct replacement natural gas control valve engineered for high-efficiency commercial and residential water heating systems. Effectively replacing the legacy part number 9004028105, this valve serves as the primary gas pressure regulator and safety shut-off mechanism. It is designed to handle specific BTU input ratings while maintaining precise manifold pressure to ensure stable combustion. In the field, this Robertshaw gas valve is recognized for its robust solenoid construction and integrated thermopile/thermocouple connections, providing reliable pilot verification. Contractors should verify the pipe size (NPT) and wiring harness compatibility when performing a retrofit on older units. This component is critical for restoring system performance in Lochinvar Power-Fin or A.O. Smith Cyclone models where the original valve has suffered from coil failure or diaphragm fatigue. Ensure all leak tests are performed according to local codes after installation.

• Direct OEM Replacement: Seamlessly replaces discontinued part 9004028105 without requiring complex manifold modifications.
• Precise Pressure Regulation: Maintains consistent WC (Water Column) pressure for optimal burner efficiency and clean combustion.
• Enhanced Durability: Built for high-cycle commercial environments, reducing call-backs for pilot outages or ignition failures.
• Safety Compliance: Features rapid-response internal shut-off to prevent gas leakage during flame loss scenarios.

Is the 100109674 compatible with LP conversion kits?
This specific model is calibrated for natural gas water heaters. To use this valve with liquid propane, you must use the manufacturer-approved LP conversion orifice and spring kit to ensure safe manifold pressure.

Are the wiring connections identical to the 9004028105?
Yes, as the designated updated version, the spade terminals and harness interface are designed for a plug-and-play installation on existing control boards.

What are the symptoms of a failing gas control valve?
Common indicators include persistent pilot outages, the burner failing to ignite despite a call for heat, or irregular manifold pressure resulting in poor combustion and soot buildup.

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.