Central system
Short definitionAn arrangement where many rooms are served by a single compressor rack. Used in large cold stores.
Several compressors run together on the same frame and serve the evaporators of all the rooms. When the load falls, some of the compressors stop, so capacity follows demand.
The condenser can sit on top of the rack or be placed outdoors as a separate unit. A central system has a high initial cost, but in large facilities it is more efficient to run.