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the 89M74 is the current Lennox-approved replacement and supersedes part numbers 100335-06 and 89M7401
supporting modern boiler system upgrades
provided the technician ensures oil compatibility and adjust expansion valves accordingly
This part number refers to the pilot burner assembly
The B1086750SP is the current production OEM service part that replaces the older B1086750 and B1086750S variants
Trane BRD6400 Control Board 340155-7026 the 89M74 is the currentThe Trane BRD6400 Control Board is a high precision Main Control Board engineered for reliability in commercial and industrial HVAC applications. As a veteran grade OEM replacement part, it functions as the central logic unit for the system, managing critical operations such as compressor sequences, fan timing, and safety circuit monitoring. This Trane circuit board is specifically designed to handle the rigorous duty cycles of chiller control panels
