Unitary Air Conditioning 31
rooms, their main use will be for heating. So the ability to provide low carbon heating at ambient temperatures as low as -10°C is a significant benefit to the end customer.
In this respect another feature to look out for is constant warming of the drain pan when in heat pump mode to avoid the condensate drain icing up at low ambient temperatures.
With all unitary air conditioning, split or condenserless, control is important in ensuring the right balance of comfort and energy efficiency. It’s also important to bear in mind that the person controlling a unitary air conditioner is unlikely to be an air conditioning expert.
It is therefore important that the control interface with the air conditioner, either in the form of a touchscreen display on
the unit or a remote controller, is easy to understand.
In some circumstances, such as in a hotel, it may also be useful for the building owner to be able to pre-set the temperature set point and prevent or minimise any further adjustment by others to help save energy.
Whilst the visual impact on the exterior of the building might be a key reason for selecting a condenserless unit, the internal aesthetics must also be considered, in terms of appearance style and size. The mounting options can also prove to be very important in meeting the customer’s requirements.
For example, while high wall mounting is perfectly acceptable in many applications there are situations where low or medium height mounting is preferable. An obvious
example is in a hotel room where there is no centralised heating and cooling system and through-the-wall units are located beneath windows.
In such cases, a condenserless unit that can be mounted at low level provides an ideal opportunity for both new-build and retrofit projects.
Another useful design feature from the service engineer’s point of view is the ability to access all components from the front of the unit so that it is not necessary to remove the unit from the wall to carry out routine maintenance.
Clearly there is no suggestion that these units will replace split and multi-split systems in all applications but there are many occasions where selecting the right condenserless, twin-duct unit is the most appropriate solution.
Advanced Engineering 5
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ACR News May 2015
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