Lennox 83W12 Gas Valve

The Lennox 83W12 Gas Valve is a high-performance 2-stage natural gas valve engineered for precision fuel regulation in residential and light commercial furnaces. This White Rodgers 36J55-255 gas valve operates on 24VAC and features a standard 1/2" NPT inlet and outlet for seamless integration into existing manifolds. As the specific Lennox R47485-003 replacement, it ensures proper ignition sequencing and combustion stability for dual-stage heating systems. The unit is factory-calibrated for a 3.5" WC high-fire setting and a 1.7" WC low-fire output, providing optimized thermal efficiency during partial-load conditions. Built with a compact footprint and a rugged solenoid design, the Lennox 103181-02 OEM valve eliminates the common pilot or flow issues associated with aftermarket components. For field technicians, this 24V furnace gas valve provides a reliable solution for restoring proper manifold pressure and burner performance in Lennox, Armstrong, and Ducane equipment.

• OEM Compatibility: Designed as the direct Lennox 83W12 furnace part to replace outdated R47485-003 and 103181-02 models.
• Dual-Stage Modulation: Enhances comfort and efficiency by switching between high and low fire based on thermostat demand.
• Standardized Connections: Features 1/2-inch NPT piping and 1/4-inch spade terminals for straightforward wiring and mounting.
• Precision Regulation: Includes a built-in pressure regulator to maintain consistent gas flow and prevent erratic burner behavior.
• Reliable Ignition: Engineered for fast-opening gas valve performance to ensure smooth ignition cycles every time.

Is the Lennox 83W12 compatible with Propane (LP)?
The 83W12 is configured for Natural Gas out of the box. For LP applications, a 77W89 conversion kit or a dedicated LP spring must be installed to match the higher pressure requirements of liquid propane.

How do I troubleshoot a gas valve that clicks but won't open?
First, verify 24VAC at the valve terminals during the ignition sequence. If voltage is present and the solenoid "clunks" but no gas flows, the internal diaphragm or seat may be stuck, necessitating a full valve replacement.

What are the manifold pressure settings for this valve?
Standard nominal settings for the 83W12 are 3.5" WC on the high-fire stage and 1.7" WC on the low-fire stage. Always use a manometer to verify these pressures at the outlet tap during commissioning.

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.