Ducted Package Roof Top Systems, Economisers for Fresh Air and Free Cooling

Ducted Package Roof Top Systems, Economisers for Fresh Air and Free Cooling

We have previously described the function of a package type system, apart from being able to supply heated or cooled air, the systems we install have an option of an economiser, and this acts as a mixing box and joins the fresh air to the recirculated air via motorised dampers. The fresh air dampers can be adjusted to always provide a minimum amount of fresh air based on the occupancy of the space being conditioned, this eliminates the need for a separate ventilation system, the fresh air dampers are modulated using either dry bulb temperature or enthalpy control.