This part usually includes the necessary mounting interface

you can limit travel anywhere between the 2" minimum and 4" maximum to match the damper's full-open/full-closed rotation

Always check for shorts before installing the new unit

Helps maintain proper load response and efficiency

oil-filled design includes a built-in physical interrupter for safety

Lochinvar & A.O. Smith 100277770 Control 322055-301 This part usually includes theThe Lochinvar & A. O. Smith 100277770 Control is a critical integrated control board engineered for high output commercial boilers, specifically the FB1501 2001 series. As an essential OEM replacement part, this module manages the full ignition sequence, blower speed regulation, and safety circuit monitoring to ensure peak thermal efficiency. It is compatible with Power Fin and Crest models, including the FBL1501, FBL1751, FBL2001, FBN1501, FBN1751,