Very Important

The fan sheaves should always be selected so that when the fan is at its maximum rpm, the payback drive should also be operating as closely as possible to its maximum attainable output speed, typically 1600-1700 rpm.

*See technical data sheet for the specific payback model's sheaves sizes and output speed ranges @ given hp load.

By correctly sizing the fan sheaves, the system will be more efficient, the drive will run cooler, and the drive's bearing life will be optimized. (Selecting too small a driven fan pulley will waste energy and create unnecessary heat dissipation in the drive.)

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