Room unit controllers provide control over the particular device or unit instance with which they’re associated. In the case of “radiators” and “chilled ceilings,” controls include scheduling of on/off operation by time-switch profiles, on/off control according to sensed variables, and proportional control of water temperature and/or flow rate according to sensed variables. One surface temperature sensor per zone, as described under sensed variables, is available for use with on/off or proportional controls.
Figure 7 - 1 : Room component dialog, including facilities for selecting defined Room Units and examples of unit types (note that this is for illustration only, as it would be very unusual to place room units from all three categories in a single space within the model).
Individual instances of a Room unit Type are indicated within the Room component dialog. The type must be defined before this action will be available for a given category of room unit. A “Room” component can represent any occupied or unoccupied 3D space in the model, including normal rooms or thermal zones, façade cavities, supply plenums, and heated or cooled ceiling or floor slabs. User-defined types are effectively sitting on a shelf—they are not active until an instance of the defined type is placed within a Room component. Each time a room unit type is placed within a room component, an additional instance of that type is created. Room unit controllers are thus specific separate instances of a particular room unit type. Note that no more than one room unit instance per category (e.g., Radiators) may be placed within a given room component; however, for Radiators and Chilled ceilings, it is possible via their respective controller dialogs to specify multiple copies of the unit for any given instance. Thus, it is possible to have many identical radiators or chilled ceilings in particular model space using a single instance of the type.
