Room
Each DXR2 room automation station can control one room. One segment also belongs to the room in each DXR2. The DXR2 includes the control function for the room as well as control function for the associated room segment. Room control includes all functions that apply to the entire room including Green Leaf or, for example, room temperature controller. A group ensures the connection between room function and room segment function.
So that multiple DXR2 can be combined to form a larger room. They can also be separated again at a later date to guarantee full flexibility.
Room segment
Each DXR2 includes, in addition to the control for the room, control for the associated room segment. A room segment is the smallest indivisible element in the building. The room segment includes all field devices and controls and controllers for the individual disciplines, e.g. the room operator unit, control of VAV actuators, or chilled ceiling control. Each room segment requires a connection to room control. Room control can take place on the same DXR2 or another DXR2.
Figure: Two rooms with one DXR2 each for room automation
Multisegment
Switching multiple DXR2s to one large room is referred to as a multisegment application. One of the DXR2 assumes room control for all switched DXR2s. Room control is disabled on the other DXR2s. In addition, all room segment functions, on the various DXR2s, are connected through grouping with the still enabled room function of the one DXR2.
Figure: Multisegment application with 2 DXR2s combined to form one room
The given room function is once again enabled when dividing up a large room to various smaller rooms and connected to the associated room segment functions. The system ensures that there is only one active room function per room and supports the switching of room segments with the same application types.
The following combinations illustrate examples of possible multisegment applications for one DXR2 with one fan coil application type:
Combination | DXR2 | DXR2 |
|---|---|---|
1 | Fan coil application | Fan coil application |
2 | Fan coil application with chilled ceiling and/or radiator application | Fan coil application with chilled ceiling and/or radiator application |
3 | Fan coil application with chilled ceiling and/or radiator application | Fan coil application |
4 | Fan coil application with chilled ceiling and/or radiator application | Chilled ceiling and/or radiator application |
5 | Chilled ceiling and/or radiator application | Chilled ceiling and/or radiator application |
The following combinations illustrate examples of possible multisegment applications for one DXR2 with VAV application type:
Combination | DXR2 | DXR2 |
|---|---|---|
1 | VAV application (supply and/or extract air) | VAV application (supply and/or extract air) |
2 | VAV application (supply air and/or extract air) with chilled ceiling and/or radiator application | VAV application (supply air and/or extract air) with chilled ceiling and/or radiator application |
3 | VAV application (supply air and/or extract air) with chilled ceiling and/or radiator application | VAV application (supply and/or extract air) |
4 | VAV application (supply air and/or extract air) with chilled ceiling and/or radiator application | Chilled ceiling and/or radiator application |
5 | Chilled ceiling and/or radiator application | Chilled ceiling and/or radiator application |
Combinations of one DXR2 with fan coil application and one with VAV application cannot be configured.
Automatic control logic for HVAC
Multisegment applications always ensure full coordination of individual electrical and mechanical installations of jointly used room control in the room segment. All HVAC controllers (e.g. temperature or fresh air) is automatically managed by the system when rooms are combined or separated and interconnected with the correct segments.
On VAV plants, supply air and extract air volume are correctly coordinated over all segments to achieve the preset setpoints for the room.
In other words, it is possible to combine multiple supply air VAVs, with multiple extract air VAVs to form one room. A maximum of one supply air and extract air VAV can be connected to each DXR2 in this multisegment application.
The DXR2 responsible for room control recognizes a fault to one VAV actuators or DXR2 controller in a multisegment application. If physically possible, the still active VAV actuators will attempt to compensate in this case for the fault VAV actuators.
Room operator units
Room operator units can be connected to various DXR2s on multisegment applications. All displays and entries on room operator units are synchronized as soon as the DXR2s are combined to one large room.
Assignment of light and blinds switches
Existing assignments of light and blinds switches are retained when merging rooms to multisegment applications. The same applies to dividing up the rooms. The assignment can be reconfigured within a room as needed.
Rearrange rooms with Desigo CC
Room can also be combined or separated in the Desigo CC management platform. Desigo CC permits the user to combine the HVAC electrical and mechanical installations from different DXR2s to one room or divided them up again. Existing assignments to light and blinds switches are unaffected.