Williams 7728 Conversion Kit

When you are field-converting a Williams Forsaire furnace for high-altitude or specific fuel requirements, the Williams 7728 Conversion Kit is the specific set required to transition from Natural Gas to Liquid Propane (LP). Designed for 40,000 BTU models, this technical kit provides the exact burner orifice and pilot orifice sizing needed to maintain the correct manifold pressure and stoichiometric balance. As a veteran technician knows, using the wrong spring or orifice on a P323209 standing pilot or P323210 electronic ignition valve leads to soot buildup and uneven combustion. This kit includes the critical red spring for the pressure regulator and a replacement plastic adjustment screw to ensure the LP gas conversion meets the required 10-inch w.c. manifold pressure. Precision-machined components in this HVAC replacement part ensure a seamless fit for Williams wall furnaces manufactured after 2013, specifically the 4007332 and 4007732 series, preventing the common "banging" or delayed ignition issues found with generic conversion attempts.

• Precise Fuel Regulation: Includes the high-tension red regulator spring calibrated for the higher density of Liquid Propane compared to natural gas.
• Model-Specific Compatibility: Engineered specifically for Williams 4007332, 4007732, 5507332, and 6007732 models, ensuring no modification to the burner pan or pilot assembly is required.
• Verified Orifice Sizing: Comes with the designated pilot and burner orifices to achieve a clean blue flame and rated 40,000 BTU output.
• Safety-First Components: Includes the essential conversion labels and tags required for code compliance and future service identification.

Can I use the 7728 kit on a furnace made before 2013?
This kit is specifically designed for newer generation Williams Forsaire units. Always check your serial number; digits 3 and 4 indicate the year. If your unit is pre-2013, the internal valve geometry may differ, and this kit should not be used.

What is the difference between the 7728 and 7686 kits?
The 7728 is the current manufacturer-recommended replacement for the older 7686 kit. It provides updated components compatible with P323209 and P323210 gas valves commonly found in modern 40,000 BTU direct-vent wall furnaces.

Do I need specialized tools for this LP conversion?
While the kit provides the hardware, you will need a manometer to verify the 10" w.c. manifold pressure and an 11" to 13" w.c. inlet pressure to ensure the gas furnace operates safely and efficiently after the fuel conversion.

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.