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This Honeywell ST9120C5005 control board ensures the heat exchanger reaches optimal temperature before the blower engages and facilitates a post-purge cycle to extract residual thermal energy
eliminating field wiring errors common with generic alternatives
Streamlined Installation: 9-inch color-coded leads simplify primary high-voltage wiring for faster field swaps
This OEM replacement part is critical for maintaining a pressure-tight hydraulic seal between the upper sections of compatible Weil-McLain commercial boilers
Laars Heating Systems A2117900 Gasket 318423-701 This Honeywell ST9120C5005 control boardThe Laars Heating Systems A2117900 Gasket is a critical OEM replacement part engineered specifically for high demand hydronic and commercial boiler applications. As a veteran technician, you know that maintaininig a gas tight seal in Mighty Therm series units (models HH, PH, VW, PW, IW, and AP, sizes 500 to 1825) is non negotiable for combustion efficiency and system safety. This industrial grade gasket features a precision cut 5. 36 inch Inside
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