MHI for Domestic/Residentail use

Air Conditioning and Heat Pump Systems for Residential Applications
Houses, Apartments, Conservatories, Studies and Bedrooms

• Good reasons for having air conditioning cooling in a home: Too hot (obviously)
• Too humid, especially in summer and autumn
• Can’t leave windows open, because of security risk
• Can’t open windows in summer because of pollen/hay fever
• Can’t open windows because of noise disturbance to neighbours (e.g. from music room/hi fi systems)
• Study used as home office, becomes uncomfortable in summer
• Study has PC and other electrical equipment which creates heat problem

Good reasons for having air conditioning/heat pump in a home:
(Heat pumps provide heating as well as cooling in the same unit. The heat pump is extremely efficient on the heating operation, having a COP (Coefficient of Performance of up to 2.5 or 3.0. COP of 2.5 means that the system will deliver 2.5KW of heat into the room, whilst consuming only 1KW of electricity, i.e. very efficient compared to, say, an electric fan heater or convector.)

All the reasons listed above, PLUS: Far more efficient than any other form of electric heating (because of high COPs, as described above)
Difficult to extend an existing central heating boiler system, e.g. for a conservatory, or extension.
Difficult to extend an existing central heating boiler system, e.g. for a loft conversion (insufficient height for expansion tank)

Cooling/Heat Pump systems are the most popular, as they are only about 12% more expensive than Cooling Only systems. Even where there is an existing central heating system, it is often cost effective to heat one room only, rather than heat a complete house.

Typical locations for air conditioning / heat pump systems.

• Living Rooms
• Studies
• Kitchens
• Conservatories
• Bedrooms
• Loft Conversions
• Games Room

Wall Mounted Systems

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.

Other Types of Units

Outdoor Unit Location
The outdoor unit can be located in the garden or side passage, up to 15 metres from the indoor unit, and must have unrestricted air space. Larger systems have pipe lengths up to 50 metres.

It is not possible to install the outdoor unit in a garage, or any kind of enclosure, as it will not be able to dissipate the heat. Outdoor units are fully weatherproof.

Power Supplies
Small systems type SRK, up to 2.5KW can normally operate from a domestic ring main. Larger units will require a separate power supply from the incoming mains distribution board.

Condensate Drainage
All air conditioning systems when cooling will reduce humidity levels by removing some of the moisture content from the conditioned air. This moisture is collected in a drain tray concealed at the bottom of the indoor unit. The collected water must then be drained away through a small drain to waste, or to outside. Sometimes it is very difficult to conceal the drain piping, or to find a suitable drain connection. Small condensate pumps are available which can deal with this problem.

If you need air conditioning at your place of work (office, shop, hotel, restaurant, gym, club), you can find more information at our offices, don't hesitate to call and ask for more information. It is interesting to note that thousands of low cost SRK systems are installed in small offices and meeting rooms, where they provide a very comfortable environment for a modest expenditure. Mitsubishi Heavy Industries is one of the ‘big six’ Japanese manufacturers, and is a world leader in the development and manufacture of high quality air conditioning systems. The range extends to large modular multi systems for office buildings up to 10,000m2, and for other commercial buildings.