The Modine 3H0337490010 Conversion Kit is the essential professional-grade solution for transitioning gas-fired heating units from natural gas to liquid propane. As a direct replacement for 3H33749-10, this secondary heat exchanger-ready kit ensures the proper manifold pressure of 10” W.C. required for safe, high-efficiency LP operation. Each OEM gas conversion kit includes precision-machined main burner orifices, required gas valve springs, and a replacement serial plate sticker to maintain unit compliance. For veteran technicians, this Modine replacement part streamlines the field conversion process for PD, PDP, and HD series heaters, eliminating the need for sourcing individual components. By using genuine unit heater conversion components, you maintain the technical integrity and CSA certification of the appliance. Whether performing a standard Modine NG to LP conversion or updating legacy hardware, this kit provides the precise combustion system adjustment tools needed for reliable performance in demanding commercial or industrial environments. Key Benefits Direct OEM Compatibility: Engineered as the specific direct replacement for 3H33749-10, ensuring zero-gap fitment within the burner manifold. Complete Field Solution: Includes all necessary LP conversion orifices and valve springs to achieve the correct BTU input rates. Compliance Ready: Provided with a propionate rating plate and serial stickers to ensure the converted unit meets all updated safety labeling requirements. Optimized Combustion: Designed to maintain a stable 10" W.C. LP gas manifold pressure for clean, soot-free operation. Simplified Installation: Standardizes the natural gas to propane transition, reducing diagnostic and setup time for service agencies. Common Questions Is a regulator spring kit required for this conversion? Yes, the kit includes the specific regulator spring required to adjust the gas valve to the higher pressure requirements of liquid propane (typically 10" W.C. manifold pressure). Can I use this kit for high-altitude installations? This kit is designed for standard elevations (0–2,000 ft). For installations above this range, a high-altitude orifice kit may be required in addition to these base components. Will this work on all Modine heaters? This kit is specific to certain Modine models such as the HD, HDS, PD, and PDP series. Always verify your specific model number on the unit serial plate before starting the conversion. 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.
