Reznor 51749 Kit

For field technicians and mechanical contractors tasked with a fuel transition, the Reznor 51749 serves as the professional-grade Natural Gas to LP Conversion Kit required to adapt unit heaters for liquid propane operation. As an authentic OEM Reznor part, this kit is specifically engineered to replace the factory-installed regulator spring and orifices, ensuring the manifold pressure is correctly matched to LP combustion requirements. Utilizing a Honeywell 391937 replacement spring, the assembly provides the necessary tension for precise gas valve regulation, maintaining the system's thermal efficiency and operational stability after the fuel changeover.

When performing the gas conversion for Reznor heaters, ensuring a leak-free seal and proper orifice sizing is non-negotiable for safety. This kit includes precisely machined LP burner orifices and a high-visibility conversion label to clearly indicate the modified fuel type for future service calls. Designed for seamless integration with single-stage gas valves, the Reznor 51749 kit eliminates the guesswork involved in field-derating or altitude adjustments, allowing for a compliant and reliable installation.

• Factory-Matched Components: Includes the Honeywell regulator spring and orifices specifically calibrated for Reznor equipment.
• Reliable Fuel Transition: Engineered to facilitate a safe NG to LP conversion without compromising burner performance.
• Enhanced Configuration Flexibility: Allows for HVAC system upgrades in locations where natural gas infrastructure is unavailable.
• OEM-Level Precision: Minimizes the risk of over-firing or soot accumulation caused by mismatched aftermarket conversion parts.

Which heater models are compatible with this conversion kit?
The 51749 kit is primarily designed for Reznor unit heaters equipped with specific Honeywell single-stage gas valves. It is essential to cross-reference your unit's serial number and valve code against the manufacturer’s technical tables to ensure the spring tension and orifice diameters match your BTU rating.

Does this kit include everything for a high-altitude installation?
While this kit covers the standard propane conversion process, installations above 2,000 feet may require additional manifold pressure adjustments. Always consult the Reznor installation manual for the specific derate values required for your local elevation.

Can I use this spring in a two-stage gas valve?
No, this kit is designated for single-stage applications. Two-stage valves require a different regulator configuration to maintain proper pressure across both high and low fire settings. Verify the HVAC part number on your existing valve before beginning the fuel type transition.

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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.