Hardware requirements can vary by housing

25 to 135 Amps

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

Rated for 35 amp contact rating at 480 VAC

Always check for shorts before installing the new unit

Lochinvar & A.O. Smith 100277770 Control 322055-301 Hardware requirements can vary byThe 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,