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

Hardware requirements can vary by housing

maintaining a consistent thermal cycle that prevents short-cycling of the compressor

Helps maintain proper load response and efficiency

Common Questions: Is the 8402-067BX compatible with older Bard units

Lochinvar & A.O. Smith 100277770 Control 322055-301 you can limit travel anywhereThe 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,