The present operating mode of the room depends on the central scheduler and local influences such as the room operator unit.
Presence control by room operator unit
DXR2 applications support the use of the Comfort button on the QMX3 room operator unit as a presence function.
When configured for presence function, the application changes from Automatic to Comfort mode when pressing the Comfort button. Re-pressing the button will toggle back to previous state, otherwise a default timer will time out after 120 minutes (configurable).
Temporary Comfort by room operator unit
The Comfort button on the QMX3 room operator units can also be used as a temporary comfort function.
When configured for temporary presence function, the room user can activate Comfort mode for 120 minutes (configurable) by pressing the button. Pressing the button again will re-trigger the timer for 120 minutes.
Control using the scheduler
(on PXC00-E.D)
The configurable Desigo System does not provide a scheduler to DXR2 automation stations. It can be created, however, on a PXC00-E.D (or other Desigo PXC…-E.D) and combined with central functions of the Desigo System.
Optionally, schedulers from BACnet third-party devices can be used to control rooms or central functions.
The scheduler for room occupancy controls the operating mode of a room or group of rooms. Each renter or area in a building can define their own occupancy and non-occupancy times and influence in this way energy consumption.
The scheduler consists of one periodically controlled weekly program and an exception day (holiday and vacation program) that overwrites the weekly program.
Under normal operations, the scheduler switches between operating modes Economy (unoccupied) and Pre-Comfort as the occupancy times preset by the operator. Comfort mode is enabled locally by pressing the comfort button on the room operator unit (occupied).
The example below illustrates a scheduler program for three possible building occupancy states and the preset, actual operating mode and describes its impact on HVAC. (For its impact on lighting and shading, please refer to table in Example in section Room control by switching the operating mode.) You can configure the DXR2 to adapt the response:
Building occupancy state | Description | Room operating mode |
|---|---|---|
Building used | Full availability of all plants. Building enabled for use. Impact of schedulers: Room operator units are enabled. | Per scheduler, room occupancy or room operator unit |
Building not used | Reduced availability of the plants. Impact of schedulers: Room operator units are locked. Use: | Economy |
Building Protection | Setpoints are at levels required to protect the building. Impact of schedulers: Room operator units are locked. Use: | Protection |