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Mitsubishi |
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Wall Mounted |
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Cassette |
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These systems are available from 2.5Kw up to 6.5Kw
Low cost systems, SRK type, consist of an indoor unit mounted on the wall at high level, which would circulate the air in the conditioned room. This is connected by two small copper pipes to a unit outside, which houses the condenser, fan and compressor (very similar to a compressor in a freezer, but larger). Some units have infra-red controls (similar to a TV remote), others have fixed wall controllers
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This is installed in a suspended ceiling, with the fascia panel on view, which has four air distribution outlets (hence the name 4-way cassette). The bulk of the unit is above the ceiling grid out of site. The fascia panel will normally blend with most modern ceilings, and supply conditioned air to a large area, without the additional cost of ducting and discharge grilles.
The FDT cassette also has the facility to deliver a small proportion of the conditioned air via a branch duct, to a small adjacent area, e.g. store room, cash office, consultation room. |
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Under Ceiling |
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Ducted Systems |
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| Where there is no ceiling void, this unit can be installed to provide a cost effective solution. Suitable for most areas, but care must be taken with regard to possible drafts, especially the larger models which can cause a problem in an office with a low ceiling. |
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Where it is necessary to conceal the air conditioning units, these units can be installed above the ceiling, and the installer would design and fit suitable ductwork and discharge grilles to give the best air distribution pattern in the room.
This type of installation is more costly, but it can be custom designed to suit special applications. |
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Multi Systems |
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VRF Systems |
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Available in multiple sizes, to accommodate 2 to 7 fan coils and for larger areas it is often more cost effective to install one outdoor unit which serves two, three or four indoor units. For example, a cassette unit installed in a long narrow room would not effectively circulate conditioned air to the far corners. In this case a twin of triple Multi System would be more suitable.
Multi systems are always less costly to install than several individual systems. |
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Large hotels will require VRF systems, where one outdoor unit can be connected to 16 (max.) indoor units. So that a 200 bedroom hotel would have approximately 14 outdoor units. All of these can be individually controlled, and can be turned off if the room is unoccupied. VRF systems have variable speed compressors (the primary drive of the heating/cooling system) which allow energy saving at part load conditions. The variable speed is controlled by an INVERTER in the outdoor unit, dependent on the combined demand of the connected indoor units.
The inverter and associated components are subject to Enhanced Capital Allowance, against company corporation tax. Details can be found on this web site under ECA. |
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