TABLE OF CONTENTS A unitary air conditioner is an apparatus consisting of one or more factory made assemblies that normally include an evaporator, a blower, a compressor, and a condenser, designed to be used together. The unit often performs heating as well as cooling functions.
Single Package Units. The single package, or so-called self-contained air conditioner, is shown symbolically in Fig. 13-1. All four basic components of the refrigeration cycle are placed in a single package or housing. Vertical single-package equipment is usually designed for inside-the-building application. Units often are equipped with line voltage controls, including integral thermostat, all factory prewired. Return air filter and grille are standard with supply air duct flanges usually located at the top of the unit. Most AC units have water-cooled condensers, which can be used with either city water or cooling tower water. Fig. 13-2 is a typical unit of this type. When it is necessary to install a unit without ductwork, a plenum and grille may be fitted to the unit for free air delivery.
Vertical units are available for installation in the space (the traditional store cooler) or with more utilitarian cabinets (sometimes designated commercial) for remote location; especially where space and noise factors assume extra importance. Commercial units are available in capacities to 50 tons and higher.
Horizontal single package units (Fig. 13-3) are designed for both indoor and outdoor installation, with the...
