Assortment / System Description

Control function
Plant operating mode determination
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Heating and cooling output is reduced to a minimum when a window is opened.
The DXR2 automation station always switches to Protection operating mode.
The window contact is connected directly to the DXR2 digital input.
The table below displays the actual operating mode based on window contact:
Window contact state Plant operating mode
Window closed No effect
Window open Protection
A presence detector detects the presence of people in a room. It controls the
operating mode of a DXR2 during occupancy. Outside building occupancy, it is
locked for HVAC and blinds functions. Light always reacts to the presence
detector. The settings can be configured individually for each room.
The presence detector has two states:
State Description
Occupied Room is occupied, DXR2 switches room
operating mode to Comfort.
Unoccupied Room is occupied, DXR2 switches plant
operating mode to Pre-Comfort.
Together with supply signals night cooling, precooling, and preheating, result in
the following plant operating mode.
Room operating
mode
Presence Window contact Night cooling
signal from
supply
Precooling from
supply
Preheating from
supply
Resulting plant
operating mode
- - Open - - - Protection
Protection - Closed - - - Protection
Economy - Closed False False False Economy
- Closed True False False Night cooling
- Closed - - True Heat up
- Closed - True False Cool down
Pre-Comfort - Closed - True - Cool down
- Closed - False - Pre-Comfort
Present Closed - - - Comfort
Absent Closed - False - Pre-Comfort
Absent Closed - True - Cool down
Comfort - Closed - - - Comfort
Present Closed - - - Comfort
Absent Closed - False - Pre-Comfort
Absent Closed - True - Cool down
Control using window
contact
Control using a
presence detector