Lochinvar & A.O. Smith 100380600 Gas Valve

Maintain peak combustion performance in high-efficiency systems with the Lochinvar & A.O. Smith 100380600 Gas Valve Coupling. Engineered as a direct OEM replacement for the Lochinvar CD/CC120 Cadet series, this assembly is a critical component for technicians addressing ignition failure or pressure offset issues. Unlike generic alternatives, the 100380600 is an integrated fan assembly with venturi and gasket, precision-matched to the negative pressure requirements of the Lochinvar Cadet blower system. It serves as the official superseding part for the older 100171983, ensuring full compatibility with factory control boards and gas train configurations. By providing a sealed interface between the gas valve and the burner, it prevents hazardous flue gas leakage and stabilizes the air-fuel mixture across the boiler’s modulation range. Professional installation ensures the venturi gasket maintains its integrity under high-thermal stress, preventing common HVAC gas valve leaks and flame rectification faults in A.O. Smith and Lochinvar commercial or residential boilers.

Key Benefits for Technicians:

• Lochinvar 100380600 compatibility: Purpose-built for CD/CC120 models to ensure exact OEM gas valve assembly fitment.
• Complete Repair Solution: Includes the blower fan, calibrated venturi, and high-temp gasket to eliminate the need for piecemealing individual seals.
• Improved Combustion Stability: Restores the precise venturi air-gas mixing necessary for a 94% AFUE rating and low-NOx operation.
• Direct Cross-Reference: Officially replaces the legacy Lochinvar 100171983 part number for seamless inventory management.
• Pressure Integrity: Engineered to withstand the specific negative pressure suction of Lochinvar Cadet blower-driven systems.

Common Questions:

Does this assembly include the coupling from the venturi to the gas valve?
Yes, the 100380600 is supplied as a complete fan assembly including the venturi and gasket. Technicians should verify the condition of the rubber coupling (MSC20274) during installation, though the primary sealing surfaces are included in this kit.

Can I use this on a Lochinvar CD 100 model?
No, this specific assembly is optimized for the CD/CC 120 models. While the configurations look similar, the internal venturi porting is specific to the 120 MBh input rating to maintain correct CO2 levels.

What are the symptoms of a failing gas valve coupling?
Common signs include "Ignition Fault" or "Flame Failure" codes on the digital display, often caused by a compromised fan gasket or restricted venturi assembly preventing the gas valve from opening under the correct negative pressure.

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.