The Modine 3H0346700009 Nat to LP Conversion Kit is a critical OEM replacement part designed to adapt natural gas unit heaters for liquid propane operation. This specific kit serves as the direct replacement for Modine 28051, ensuring a seamless field transition for Modine PD250 and PDP250 series heaters. Built with durable, high-quality metals, the kit includes precisely machined burner orifices, a regulator conversion kit, and the necessary conversion rating plates required for compliance and safety. As a veteran-grade HVAC fuel conversion solution, it facilitates accurate manifold pressure adjustments—typically shifting from 3.5" W.C. for natural gas to 10" W.C. for propane—to maintain thermal efficiency and prevent soot accumulation or heat exchanger damage. Key Benefits: Exact OEM Compatibility: Verified direct replacement for 28051, eliminating guesswork during Modine heater maintenance for PD/PDP 250 models. Complete Conversion Package: Includes all necessary gas valve regulator springs, orifices, and LP conversion labels for a code-compliant installation. Enhanced Reliability: Utilizes corrosion-resistant components to ensure long-term stability in high-demand commercial heating environments. Optimized Performance: Engineered to provide the precise BTU input required for propane, protecting the heat exchanger from over-firing conditions. Common Questions: Is this kit compatible with high-altitude installations? This 3H0346700009 kit is rated for standard elevations (0–2,000 ft). For installations above this range, specialized high-altitude orifice kits must be used in conjunction with this conversion set to achieve the correct derating. Can I use this for a spark ignition or pilot ignition system? Refer to your specific control code on the unit serial plate. This kit is designed for Modine PD250 units; however, if your system uses direct spark ignition, the pilot orifice included in the kit may be discarded as per the technical manual. What are the pressure requirements after conversion? After installing the propane conversion kit, the inlet pressure should be maintained between 11" and 14" W.C., with the manifold pressure precisely set to 10" W.C. to ensure a stable and clean burn. 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.
