Predictive Maintenance: Makeup Air Unit


$17,000 capital investment delayed by approximately five years.

The Background

The power draw of a typical packaged A/C unit is comprised of two main loads: the compressor and the blower fan. For units like these, which operate 24/7, the blower fan is always on. The blower fan can be seen as the flat baseline load in the image below. In addition to the blower fan, the compressors turn on when the unit needs to cool the air it is supplying to the building. The compressors turn on and off to meet the cooling needs of the unit.

The more ON/OFF cycles a compressor undergoes, the faster it wears out. Even with a Building Management System, owners can remain oblivious of such issues with their equipment.


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Comly Wilson