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As part of the HVAC control system, an economizer is designed to save energy, typically reducing overall cooling energy consumption by twenty to thirty percent.
In a typical Air cooled chiller and Water cooled chiller, electricity is consumed by two major components: the compressor(s), condenser fan(s).
Energy used by the compressor accounts for the largest percentage of the total electricity consumed. An economizer reduces electricity consumption by reducing the refrigeration compressor run time.