Lennox 11K51 Conversion Kit

2 STAGE NAT TO LP CONV KIT

Lennox 11K51 Conversion Kit (Model 604888-14) – Natural Gas to LP/Propane Gas Conversion Kit for EL280, SL280, EL296, EL297, ML296 Series Furnaces

The Lennox 11K51 (Model 604888-14) Conversion Kit is a genuine OEM Natural Gas to LP/Propane conversion kit designed for select Lennox two-stage gas furnaces, including the EL280, SL280, EL296, EL297, and ML296 series. This high-quality kit provides all necessary components to safely and efficiently convert your furnace from natural gas operation to regulated LP/propane use.

Engineered to Lennox’s precise standards, this kit ensures optimal performance, safety, and compatibility, allowing your system to maintain efficient heating output after conversion.

Key Features:

• Brand: Lennox

• Catalog Number: 11K51

• Model/Part Number: 604888-14

• Type: Natural Gas to LP/Propane Conversion Kit

• For Use With: EL280, SL280, EL296, EL297, ML296 series units

• Orifice Size: 0.034 inch

• Gross Weight: 1.2 lb

Kit Includes:

• (2) White Rodgers LP/Propane regulator springs (77W89)

• (2) Resideo LP/Propane regulator springs (23Y44)

• (12) Main burner orifices (0.034) (17U23)

• (1) Gas converter sticker

• (1) Nameplate conversion sticker

• (1) Low gas inlet pressure switch (S145)

• (1) Gas valve inlet fitting

• (1) Wire harness

Technical Details:

• Compatible with White-Rodgers F92-1008 two-stage fast/slow open 36G, H, J gas valves

• Regulation range:

  • Low fire: 4.0” to 10.0” W.C.

  • High fire: 6.0” to 12.0” W.C.

Benefits:

• Converts Lennox two-stage furnaces from Natural Gas to LP/Propane

• Ensures precise fuel regulation for safe, efficient heating

• OEM-grade components guarantee reliable performance and long service life

• Complete kit with all required hardware and labels for easy installation