swing chiller A smaller-capacity chiller used in a multiple-chiller system. It is alternated on and off between the larger chillers' operation to serve as a smaller, incremental step of loading.
variable-primary-flow (VPF) system A type of chilled-water system that is designed to vary the flow of water throughout the entire system—through the evaporator of each operating chiller as well as through the cooling coils.
variable-speed drive A device used to vary the capacity of a centrifugal pump by varying the speed of the motor that rotates the pump impeller.
water-cooled condenser A type of condenser in which water flows through the tubes and absorbs heat from the refrigerant that fills the surrounding shell.
