These are factory assembled units having a complete system mounted in a cabinet. The system is usually water cooled and is used in small commercial or other establishments such as restaurants, stores, banks and laboratories, etc. In early days, the capacities of such units ranged from 2 to 10 ton with 2, 3 and 5 ton sizes predominating. Now the units are available in capacities up to 100 ton. The equipment may be located in the conditioned space or outside the conditioned space, with or without ducts. In the conditioned space, they may be floor mounted, ceiling mounted or window mounted. Outside the conditioned space, they may be located in the basement, garage or attic.
These units are divided into two groups depending upon the location of components as:
(i) Remote type
(ii) Console type.
Remote type: In this type of system, the air handling unit is separated from the condensing unit. They may be of horizontal or vertical type depending the position of drain pan and filter.
Console type: The console is placed in the room below the window sill and has suitable fresh air inlet opening, provided in the walls.
