Lochinvar & A.O. Smith 100346570 Control Valve

The Lochinvar & A.O. Smith 100346570 Natural Gas Control Valve is a genuine OEM replacement engineered for high-recovery residential and commercial water heating systems. As the direct replacement for 100339497, this Ultra Low NOx (ULN) gas valve features a 1-inch CAV (Constant Air Velocity) configuration. Designed for precision fuel regulation, it integrates a 750 millivolt generator power source and an internal spark igniter to ensure consistent pilot ignition without external power. The unit includes a diagnostic LED status indicator that provides real-time feedback and simplifies troubleshooting by flashing specific error codes. This natural gas control valve is a critical component for maintaining specialized combustion requirements in A.O. Smith, Lochinvar, and Reliance equipment, ensuring the burner assembly operates within strict emission standards while providing accurate thermostatic control. Its heavy-duty construction is built to withstand the high-demand cycles of modern condensing and non-condensing heaters.

Key Benefits

• Direct OEM Match: Provides an exact fit and functional parity for part numbers 100346570 and 100339497.
• Enhanced Troubleshooting: The integrated LED indicator blinks status codes to identify ignition failures or thermistor issues quickly.
• Regulatory Compliance: Specifically designed as an Ultra Low NOx component to meet stringent air quality standards.
• Self-Powered Operation: Utilizes a thermopile/millivolt generator, allowing the water heater to function during power outages.
• Safety Certified: Features a factory-calibrated pressure regulator and automatic shut-off to prevent hazardous gas accumulation.

Common Questions

Is this valve compatible with Propane (LP) units?
No, this specific model (100346570) is calibrated exclusively for Natural Gas. Using it with LP will cause improper combustion and equipment damage.

Does this part include the manifold or just the valve?
This is the standalone gas control valve assembly. While it includes the internal electronic thermostat and spark igniter, additional manifold piping from the previous unit may need to be transferred.

What does it mean if the LED blinks once every three seconds?
A single blink every three seconds typically indicates normal operation and the presence of a steady pilot flame.

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.