13 – Packaged units

Publisher Summary A wide range of factory-built packaged units is made, and it covers most requirements except the larger or more specialized installations. The basic condensing unit is a single package comprising the compressor with its drive, the condenser and all connecting piping, and the necessary controls to make the set functional. The true packaged unit will have all the parts of the system and will be factory tested in the complete state. To avoid the constraint of having all parts in one package, the evaporator set may be split from the condenser, the compressor going with either. Comprehensive application data should be made available for all marketed packaged units, to allow designers or sales engineers to make the correct selections for their purposes. However, it should be borne in mind that manufacturers or sales outlets are frequently not aware of all the parameters of an installation, and the interpretation of catalogue data has many pitfalls. The requirement for transport air-conditioning or refrigeration is for an air cooling, air-cooled unit with reliable availability of service. A very large variety of self-contained refrigeration and air-conditioning packages are made, mainly for the consumer durable market and small domestic applications.