Variable speed drive (optional)
A Variable Speed Drive can be factory packaged with the chiller. It is designed to vary the
compressor motor speed and pre-rotation vane position by controlling the frequency and voltage
of the electrical power to the motor. Operational information is contained in the Variable Speed
Drive – Operation (Form 160.00-O1). The control logic automatically adjusts motor speed and
compressor pre-rotation vane position for maximum part load efficiency by analyzing information
fed to it by sensors located throughout the chiller.
23Model YK (Style H), R-134a and R-513A
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