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Packaged air conditioners or PAC's are a big part of the commercial comfort air conditioning market. Unlike split-system equipment, internal premises of a building required for complex air-conditioners. The inner space is stored in this direction can become a profitable rental space. Access to the equipment for service and maintenance work is not required mechanic to enter the controlled zone, which allows to minimize the disruption of normal business.
On the roof installations are the most common for equipment, and many models can be adapted for surface mounting with side air connections. Side connections allow a direct connection to the air ducts systems located in a crawl space above ground level. Most residential applications use of equipment on the discharge side connections rather than roof mounting.
Roof units are typically installed at the factory-supplied roof curb mounted in the roof by the contractor before the installation of the unit.
During installation, strip and added device fraud place.
PAC units most often used as direct refrigerant system, with one unit in the zone temperature control. This is especially true for size below 20 tons. units exceeding 20 tonnes, however, sometimes used on all air heating systems, control multiple zones fed from the same units. For some types of all-air systems, for example, variable air volume systems, a special version of the unit is required. For other types of standard unit is satisfactory...
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Refrigeration 
