Lennox 11K50 Conversion Kit

When you're converting a residential or light commercial furnace from natural gas to liquid propane, the Lennox 11K50—also documented as Lennox 11K5001—is the specific factory-authorized LP conversion kit required for a code-compliant installation. This kit is engineered for use with a wide range of Lennox 80% AFUE and 90% AFUE gas furnaces, including the G1, G*M, and MG series. As a veteran technician knows, maintaining combustion efficiency during a fuel changeover depends on precise orifice sizing and regulator spring tension. This kit provides twelve 0.034 burner orifices and the critical natural gas to propane gas conversion components needed to adjust the manifold pressure. By using these OEM furnace parts, you ensure the gas valve regulator is properly calibrated for the higher energy density of propane, preventing carboning and ensuring flame stability across the burner assembly. This furnace changeover kit is essential for HVAC professionals performing field conversions in accordance with manufacturer technical specifications.

• Matches Lennox 11K5001 technical specifications for seamless component compatibility.
• Includes the S145 low gas inlet pressure switch to prevent burner damage during fuel supply fluctuations.
• Standardized 0.034 orifice size ensures correct BTU output for 80% and 90% AFUE furnace models.
• Complete regulator spring kit included for recalibrating the gas valve to liquid propane operating pressures.
• Provides all necessary conversion nameplate stickers required for local code compliance and future service identification.

Is the Lennox 11K50 compatible with older 11K5001 models?
Yes, the 11K50 is the direct engineering equivalent and identical replacement for the 11K5001. It covers the same furnace series and provides the exact same technical components for fuel conversion.

What is the manifold pressure setting for this LP kit?
Typically, a Lennox gas furnace conversion using this kit requires a manifold pressure of approximately 10 inches w.c., though you must always verify the specific rating on the unit's nameplate and the included instructions after installing the LP regulator spring.

Does this kit include a low pressure switch?
Yes, the 11K50 includes a low gas inlet pressure switch and the corresponding wiring harness, which are critical safety components for monitoring propane tank supply levels and preventing unsafe combustion conditions.

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.