If the unit is cooling only then it will typically have a single coil connected to a refrigeration unit. Depending on where in the world the RTU is located and the ambient conditions it faces, some units will be cooling only, very occasionally they are heating only and some will be heating and cooling. These coils will be used to cool or heat the air by adding or removing thermal energy. The return air is usually removed by an external exhaust fan to balance the air pressure.Īfter the filters we’ll have some coils. It takes in 100% fresh air and conditions it. This first unit is fresh air only, no re-circulation occurs. There are many types of Rooftop units, and we’ll look at four different typical versions, starting with the most basic. That’s why they’re called package air conditioners and we’ll look inside some model units shortly to understand why. Additionally, AHU’s will often be connected to central plant such as chillers and boilers to provide the heating and cooling, but RTU’s are self contained and have everything they need all in one unit. Rooftop units are a type of air handler, the main difference is that they are usually more compact and they’re always installed on the roof so they need to be more robust and weather proof to deal with the sun, rain, snow, wind etc. If you have watched that you’ll notice the units are very similar. I would encourage you to check that out and watch the video tutorial, click here to view that. Now in our last tutorial we looked at air handling units or AHU’s.
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