An air-cooled chiller is a device that generates cold water to act as the means of cooling for large buildings. The chilled water is distributed through pipes in a building and passes through coils in air handlers, fan-coil units, or other systems. Air passes across these coils where it is cooled and distributed to the building. Large axial fans on the air-cooled chiller serve as the means to reject the heat outside of the building. EC fan technology allows for highly efficient operation of these fans as well as the ability to run at reduced speeds when the chiller is not running at 100%. This part-load operation of the fans is more efficient and is much quieter than 100% load.