Lennox 29M85 Spring Kit

The Lennox 29M85 (also identified as 29M8501) is a critical Gas Valve LP Spring Kit engineered for high-precision fuel regulation in residential and light commercial HVAC systems. This genuine OEM replacement ensures that gas valves, including several White-Rodgers and Honeywell models utilized in Lennox equipment, are properly converted and calibrated for liquid propane (LP) operation. In the field, installing this kit is essential for technicians to maintain the correct manifold pressure and stable burner performance, preventing issues such as erratic combustion or improper flue gas venting. By replacing a standard natural gas regulator spring with this Lennox 29M85 conversion kit, you ensure that the valve modulates at the higher pressure requirements necessitated by propane. This component is built to exacting factory tolerances, providing the reliability required for 24-hour cycle demands while maintaining the safety profile of the original heating system.

Key Benefits for Technicians:

• OEM Calibration: Guaranteed to meet manufacturer-specific tension requirements for accurate manifold pressure adjustments.
• Cross-Reference Compatibility: Directly replaces and is identical to part number 29M8501 for seamless inventory management.
• System Stability: Prevents hunting and pressure fluctuations in propane-fired furnaces and air handlers.
• High-Grade Construction: Corrosion-resistant spring material designed to withstand the chemical properties of LP additives.
• Professional Grade: Eliminates the risks associated with generic or "universal" conversion springs that can cause valve failure.

Common Questions:

Is the 29M85 compatible with all Lennox gas valves?
While designed for widespread use in Lennox systems, it is specifically intended for valves compatible with LP conversion. Always check the gas valve model number—typically found on the valve body—against the unit's technical data sheet to ensure this kit matches the internal regulator seat.

What is the difference between 29M85 and 29M8501?
There is no functional or technical difference between these two numbers; 29M8501 is simply the lengthened SKU used in certain supply chain databases, but the hardware is identical.

Does this kit include the conversion label?
This specific part number focuses on the spring component required for mechanical regulation. It is a standard practice for technicians to ensure all local codes and labeling requirements are followed after the LP spring installation.

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.