System Protection: Prevents unnecessary auxiliary heat cycling

The reversible rotation feature and dual mounting options—including shell-band and thru-bolt configurations—ensure seamless installation in tight blower housings

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

Industrial Durability: Specifically rated for the high-torque and high-pressure demands of commercial water regulation

It serves as the authoritative replacement for part number HC37XE278A

Carrier KR51BF415 Motor Pulley 321894-709 System Protection: Prevents unnecessary auxiliaryThe 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