4 inches allows technicians to fine-tune belt-driven fan speeds

Key Benefits Multi-Speed Flexibility: Features a 3-speed design to allow for precise airflow adjustments across heating and cooling cycles

System Protection: Prevents unnecessary auxiliary heat cycling

High-Temperature Versatility: The 100/240 degree range is ideal for high-limit or operating control in hot water and steam systems

the unit prevents rapid cycling and nuisance tripping caused by surface turbulence or splashing

Carrier KR51BF415 Motor Pulley 321894-709 4 inches allows technicians toThe Carrier KR51BF415 Motor Pulley is a precision engineered fixed bore drive component designed for specific Carrier, Bryant, and Payne air handling units and rooftop systems. Featuring a 7 8 inch bore and a 4. 15 inch outside diameter, this Type A belt pulley (also compatible with AX section belts) provides a consistent 1: 1 or reduced drive ratio to maintain precise blower wheel RPMs. Constructed from high grade cast iron, it offers superior