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The different types are:-

  • Wall mounted split systems
  • Ceiling / wall / corner split systems
  • Floor mounted split systems
  • Ceiling cassette split systems
  • Under ceiling suspended split systems
  • Ducted split systems
  • Multi head systems

Wall mounted split systems

Wall mounted split systems are installed at a high level. They are designed to be installed at a height of approximately 1800mm to 2000mm above floor level so that airflow can be distributed evenly from the supply air louvres.

These units require access for installation to the outside or an area where services visibility is not a concern as the piping, wiring and condensate connections are at the rear of the units. Wall mounted split systems come in a range of capacities however they tend to be manufactured to a maximum capacity of approximately 10 kWr.

Airflow distribution is made possible by the dual use of up/down and right/left air direction swing louvres, achieving a comfortable environment. This is a basic entry level system suitable for homes where a single room is to be air conditioned. It consists of an indoor unit which does the cooling and heating and is connected to a discrete outdoor unit which rejects unwanted heat.

The best choice for an application depends on a number of factors - such as where it is to be fitted, the available space, and the style and lay-out of the room.


Ceiling / wall / corner split systems

These units are similar to wall mounted units except that they are positioned in the corner where the wall meets wall and ceiling (cornice) of the room or area. They are designed to sit very high on the wall, just 40mm below the ceiling and remain very unobtrusive.


Floor mounted split systems

Floor mounted (console) units are installed on the floor (or sometimes just above floor level) allowing installation in areas not adjacent to the outside. Services generally connect from beneath and / or behind. Some manufacturers have designed units to allow partial recessing into the wall giving greater application and appeal.

Multi head split systems

As an added feature, most manufacturers provide ‘multi-split systems’. These are similar to the single split systems described above, except that they consist of a single outdoor condensing unit with multiple indoor units connected – 2, 3 or 4. These indoor units may be wall, floor, cassette, underceiling, or ducted fan-coil units, depending upon the requirements of the installation and type availability from the manufacturer. These units are ideal for use where space is limited in the installation of multiple outdoor condensing units.

Under ceiling suspended split systems

These units are similar in design to floor mounted units however are designed to be suspended directly on the ceiling of a room or space. Services for these units are able to be run from the units into a ceiling space above or to the rear of units, providing flexibility in installation locations.


Ducted split systems

Ducted systems are extremely popular form of air conditioning. The majority of systems are generally of "split‟ system design consisting of a single outdoor condensing unit, connected to an in-ceiling fan-coil unit. The fan-coil unit requires supply and return ducting to be connected to it, delivering air to the required rooms, spaces or areas.

Ducted split systems are predominately fully recirculating systems. That is they draw air through a "centrally‟ located return intake air grille (which usually incorporates an air filter) through flexible ducting to the fan-coil unit. Here it passes over the refrigeration coil (evaporator when cooling, condenser when heating) then transferred into the supply air duct system to the various rooms, spaces or areas.

The ducting system can be divided up into different areas, called "zones‟. The airflow to these zones can then be controlled through the installation of motorised duct mounted damper assemblies enabling the owner to control the airflow to these areas when conditioning is or is not required.

As the system is a single system (one evaporator, condenser, compressor etc.), generally only a single temperature controller is used. With the increased use of electronics within the industry, more complex, accurate and smarter control systems have emerged.

Temperature controllers having a single or multiple temperature sensing arrangements have become quite popular. With the ability to have remote sensors fitted, controllers can now be located virtually anywhere a client wants provided access for use is not impeded. Additionally, the installation of multiple sensors on some systems may permit selection of a particular sensor, which controls the operating temperature of the system for that particular area or zone. They can also be used together to "average‟ conditions.

Zone temperature control can also be achieved by varying the volume of air to each zone. This is achieved by having temperature sensors in each zone, connected to a "micro-processor‟. The microprocessor proportionally opens or closes the corresponding zone assembly, which supplies the required volume of air to the particular zone. When all zones start to close down, the supply fan speed lowers, or air is by-passed directly from supply ducting to return ducting.

Today, ducted systems are generally reverse cycle (cooling and heating) and some manufacturers offer inverter and non-inverter systems. Similar to other split systems; ducted systems are available in a multitude of capacities, ranging from 4.5 kWr to over 90 kWr for systems used in commercial applications.

Ceiling cassette split systems

Ceiling cassette units are mounted in the ceiling cavity of the room or area with a fascia fitted "flush‟ to the ceiling concealing the bulk of the evaporator. Although mainly used in small commercial applications, they do have their uses in some residential applications and particularly apartments and hotel rooms.

As the majority of the fan-coil is positioned above the ceiling, sufficient space in the ceiling void is required for not only fitting of the fan-coil unit but also servicing and maintenance in the future.




This page was last modified on 4th June 2010 and maybe out of date with regards to its information at the time of reading this article. The information above is only intended for use a guide and should not be 100% relied upon as a substitute for official manufacturer technical advice. Quality Electrics disclaims responsibility for any damage, claim, or liability any person may incur, whether caused by negligence or otherwise, as a result of anything contained in our articles.


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