Lennox 41K35 Valve

The Lennox 41K35 Valve is a professional-grade 24V natural gas valve designed for precision fuel regulation in residential and commercial heating systems. This slow-open gas valve features a 1/2" I.P. inlet and outlet, engineered to provide a controlled ramp-up of gas flow that prevents hard ignitions and reduces stress on the heat exchanger. As a critical HVAC replacement part, the 41K35 is the direct factory-authorized replacement for legacy models 41K3501 and R39514B001. It is commonly utilized in Lennox furnace repair across G12, G16, and G20 series units. With a 0.5A current draw and a factory-set regulator pressure of 3.5" W.C., this Honeywell VR8204H1048 equivalent ensures stable burner performance. For technicians performing gas valve troubleshooting, this 60Hz component supports direct spark and intermittent pilot ignition systems, maintaining strict manifold pressure for peak combustion efficiency.

• Direct OEM Compatibility: Seamlessly replaces 41K3501 and R39514B001, ensuring the manifold alignment and electrical connections match the original installation.
• Slow-Opening Action: Provides a "soft start" for the burner assembly, which mitigates ignition noise and protects system components from sudden pressure surges.
• Technical Reliability: Rated for high-capacity throughput (20,000 to 200,000 BTUH for Natural Gas) and features a standard 1/8" NPT pressure tap for accurate manometer readings.
• Field Adjustable: While factory-set, the regulator allows for precision field adjustments between 3" and 5" W.C. to meet specific site requirements.

What are the primary symptoms of a failing 41K35 valve?
Common indicators include the furnace failing to light despite a confirmed 24V signal from the control board, intermittent pilot outages, or inconsistent manifold pressure leading to poor combustion.

Is this valve compatible with LP (Propane) systems?
This specific 41K35 assembly is configured for Natural Gas. To utilize it in an LP application, a certified conversion kit must be installed by a licensed technician to swap the regulator spring and orifices.

Can this replace a standard fast-opening valve?
While the footprint may match, replacing a fast-open valve with a slow-open gas valve should only be done if specified by the manufacturer's cross-reference data to ensure ignition timing remains within safe parameters.

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.