COMPRESSOR PACKS

This term is used to describe an assembly of several compressors mounted on a frame, complete with liquid receiver, suction and discharge headers, oil separ­ation and oil return piping and controls (Figures 13.4 and 13.5). They are widely used in centralized supermarket systems and the compressors serv­ing the low-temperature evaporators and those serving the chill loads may be mounted on the same frame and piped accordingly. Compressor packs provide an efficient means of dealing with a wide span of refrigeration load. There can be up to 10 small compressors, either scroll or semi-hermetic, and this offers a large number of capacity steps by switching compressors. Alternatively a smaller number of uneven compressors may be used. Compressor packs are usually custom built to individual supermarket requirements although manu­facturers will probably use standardized design and construction methods.

The concept has been extended to factory-built rooftop units where the com­pressor pack is installed within the overall condenser housing (Figure 13.6).

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