York S1-025-25463-000 Conversion Spring

The York S1-025-25463-000 is an OEM liquid propane (LP) conversion spring designed for field-converting natural gas-fired furnaces and heating units to propane operation. This gas valve regulator spring is a critical component for technicians performing fuel changeovers, as it provides the necessary tension to achieve the high manifold pressures required for stable propane combustion—typically 10" W.C. to 11" W.C. depending on the specific York furnace model. It is compatible with popular units like the 1NP0418 and 1HA0459 and is often utilized with White-Rodgers 36G series and Honeywell gas valves found in Source 1 equipment. Integrating this LP gas conversion kit component ensures that the regulator adjustment screw can maintain proper spring rate and seat pressure, preventing dangerous ignition issues or burner sooting. As a genuine HVAC replacement part, it meets the exact physical specifications of the factory original, including a precise length and wire gauge to prevent drifting pressure settings. Successful installation requires a manometer to verify the outlet pressure at the manifold and typically involves setting the regulator adjustment screw flush before the final natural gas to propane conversion calibration. Using this dedicated S1-025-25463-000 spring ensures the gas control assembly operates within its intended performance envelope for safe, reliable heating.

• Precise Pressure Regulation: Specifically engineered to handle the increased tension required for 10" W.C. to 11" W.C. propane manifold pressure.
• Broad Compatibility: Fits a wide range of York, Luxaire, and Coleman residential furnaces using Source 1 and OEM gas valves.
• Combustion Stability: Eliminates the risk of pressure fluctuation and "hunting" that can occur when using non-spec or generic conversion springs.
• Direct OEM Fit: Drop-in replacement for the standard natural gas spring, ensuring the regulator cap and adjustment screw seat correctly.

• Can I just tighten the natural gas spring instead of using the S1-025-25463-000? No. Natural gas springs are not rated for the compression required for LP pressures; over-compressing them can lead to erratic fuel delivery or valve failure.
• Is this spring compatible with two-stage gas valves? While this part is used in many single-stage conversions, always verify your specific model's part list, as two-stage valves may require multiple springs for high and low fire settings.
• What manifold pressure should I set after installing this spring? Most York systems require 10.0" W.C. for LP, but always check the unit nameplate or conversion kit instructions to confirm the exact target.

This item is not eligible for free shipping.

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.