Lochinvar & A.O. Smith 100277781 Control R-22 Always verify the lead-end or

Always verify the lead-end or shaft-end rotation requirement of your specific blower housing before installation

or the 632200R pressure switch has failed

this assembly delivers consistent performance at 3000 RPM on high speed

it is designed to withstand high-temperature environments while maintaining a stable pilot flame pattern for reliable main burner ignition

Lochinvar & A.O. Smith 100277781 Control R-22 Always verify the lead-end orThe Lochinvar 100277781 Control (Model FB751 1251) is an integrated control board engineered specifically for Crest Heating Boilers. As a critical OEM replacement part, this module manages the firing sequence, ignition control, and safety parameters for high efficiency hydronic systems. This model is a direct boiler part replacement for units with serial numbers beginning with 4015, ensuring seamless integration with existing HVAC wiring harnesses and