Through window/wall air conditioning units are supplied as completely integral systems. All the parts are completely contained on a chassis base which fits inside the outer case.

A hole is required in the window or wall to fit the complete outer cabinet through. The rear end of this cabinet is made to be outside for cooling purposes, and all that is seen inside the room is the facia panel with all the controls fitted to it. The most common location for this style of unit is underneath a window because the window frame itself can act as a lintel or brick support if it had been required.

The inside chassis, with all the components on, can slide out from the outer cabinet to allow fixing and securing of the cabinet. Once the outer cabinet is secured into its position, then the inner chassis can slide into the cabinet and the system is ready to be plugged in to the electrical supply and begin operating immediately.

Some of the larger systems of this type would be improved if additional supporting brackets were fitted to the outside section that overhangs the wall. A lot of the larger systems have a considerable overhang and the weight can make them sag more than would be recommended. A simple wooden frame is sufficient for support if required, but we also have a good range of brackets made expressly for the purpose, and we would suggest you look at these in our Spares and Accessories department. A small amount of backward tilt is required however to allow the condensed water that builds up within the system to drain outside through the small provided hole at the back of the unit's cabinet.

Most of these style of air conditioning units are supplied with the compressor secured down for transportation. Whilst the inner chassis is pulled out of the outer cabinet, it is a good idea to take this opportunity to remove any packing or loosen and travel bolts on the compressor as directed by the instructions that are supplied with the equipment.

As with all air conditioning or refrigeration equipment, never turn the cabinet that holds the compressor upside down. The oil that is in the compressor will run into the discharge pipework inside the working of the system, and will create problems of operation. If at any time you suspect the compressor has been upside down, then it should be left in an upright position for at least 12 hours before connecting to the electrical supply.