The fixed differential ensures a consistent gap between the trip point and the point at which the system can be manually reset

and plug nut core tube sub-assembly

which automatically adjusts compressor speed to match the cooling load

The 1-3/16" bore must match the motor shaft exactly

Lochinvar & A.O. Smith 100108891 Blower Fan 320734-701 The fixed differential ensures aAs a seasoned technician, you know that the Lochinvar & A. O. Smith 100108891 Blower Fan is a critical component for maintaining the precise air to fuel ratio required in high efficiency forced draft boilers. This OEM blower assembly, often cross referenced with part numbers 9002669005 and 0012400490, is engineered to handle the rigorous demands of combustion air delivery and effective flue gas removal. Featuring a single phase motor rated at . 05 HP