only the OEM 550001655 supports the specific boiler parameter settings and modulating blower logic required for these Utica and Dunkirk models

a cracked ceramic insulator or a degraded element requires a full replacement of the Lennox Armstrong R44992-001 to ensure reliable operation

25-inch threaded ports

the 19" diameter and 33-degree pitch are specific to certain cabinet designs

The Reznor 99261 LP-NAT C/O KIT is a professional-grade field conversion solution engineered to transition specific Reznor gas-fired heating units from liquid propane to natural gas operation

Fireye MEP230H Module R-22 only the OEM 550001655 supportsThe Fireye MEP230H is a specialized MicroM Programmer Module engineered for high performance flame safeguard applications. Designed to interface with Modular MicroM Chassis (including MC120 and MC230 series), this module provides critical sequencing and monitoring for commercial and industrial burners. While sharing the adjustable architecture of the standard MEP230, the MEP230H features a dedicated 8 second flame stabilization period. This specific