This Utica-Dunkirk 43331202 Conversion Kit is a critical OEM component designed to field-convert specific high-efficiency boilers from natural gas to liquid propane. Engineering a precise fuel transition in UB90-100 series boilers requires exact orifice sizing and regulator spring tension to maintain the manifold pressure required for safe and efficient combustion. As a genuine ECR International part, this kit ensures the unit retains its original AFUE ratings and factory certifications without the risks associated with generic alternatives. The package includes main burner orifices, a specialized LP regulator spring, and the mandatory conversion labeling to provide clear identification for future service. Using this LP gas conversion kit guarantees the Honeywell gas valve or White Rodgers valve operates within factory specifications, preventing delayed ignition or incomplete combustion issues common with improper field adjustments. Key Benefits: Maintains OEM system performance and safety certifications during fuel conversion. Includes precision-machined brass LP orifices for accurate BTU input control. Features a high-tension red LP spring for proper pressure regulator modulation. Provides conversion plate stickers required for jurisdictional code compliance. Reduces risk of soot accumulation and heat exchanger damage caused by incorrect fuel-to-air ratios. Common Questions: Which boiler models are compatible with this kit? This kit is engineered specifically for the Utica UB90-100 and Dunkirk 90-100 boiler series. Always verify your specific serial number and gas valve model before attempting installation. Is a manometer required for the conversion? Yes, a calibrated manometer is essential to verify the manifold pressure (typically 10.0" to 11.0" W.C. for LP) and ensure the inlet pressure falls within the 11.0" to 14.0" W.C. range. Can I reuse the natural gas spring? No, the natural gas spring must be replaced with the LP spring provided in the kit to allow the pressure regulator to reach the higher pressures required for Liquid Propane. 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.
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