Hardware requirements can vary by housing

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

Engineered by Honeywell (Model L4064B2210)

Always check for shorts before installing the new unit

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

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,