Assortment / System Description

Central applications
Operating strategy for blinds
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24 Central applications
The configurable DXR2 room automation provides the following central
functions. The functions are used to coordinate supply and demand signals for
the entire building or large sections thereof between the rooms and generation
plants.
● Central operating groups including room operating mode, setpoints, and
seasonal compensation, lighting, shading, and emergency commands
● Demand-dependent hot water supply system with temperature setpoint
● Demand-dependent cooling water supply system with temperature setpoint,
adjustment to prevent condensation, and calculating free cooling
● Demand-dependent 2-pipe supply system for heating/cooling water
including temperature setpoint, changeover, and calculation of free cooling
● Demand-dependent air handling unit (supply and extract air) including
temperature setpoint, maximum humidity setpoint, pressure setpoint,
maintaining a minimum central air flow, calculating air flow deviation, and
cumulative air flow setpoints
● Demand-dependent heat pump supply system
● VAV emergency group including shutdown, fume hood, pressure
development, or purge
● Information of central weather station includes outside air temperature,
outside brightness, solar radiation, wind speed, and precipitation
● Central facade functions for shading, including brightness calculation,
central operating group for facade, or anti-glare protection calculation
● Central shading protection group for wind, precipitation, and frost
protection, staged distribution of blinds commands in large buildings
The central functions are available to the DXR2.E/M18. This application type is
not preloaded at the factors, but rather must be downloaded for a specific
project to one or more DXR2.E/M18s.
As a rule, all central functions can be configured on a DXR2. All central
functions can be selected and configured on the application type for central
functions. Various aspects on a project define how many DXR2 are used with
central functions:
The planned use of onboard inputs for the applicable central functions (e.g.
outside temperature sensor for HVAC supply function, wind sensor for facade
protection function, etc.) determines possible distribution of central functions
to multiple automation stations.
One DXR2 with central functions can control the following number of supply
groups:
● 4 x controls for a facade with 4 facade segments each (3 of which can be
delayed)
● 4 x groups for distributing room operating mode to rooms
● 2 x hot water supply groups
● 2 x chilled water supply groups
● 1 x air supply group (based on demand)
● 1 x heat pump supply group
● 2 x HVAC emergency controls (off, positive pressure, negative pressure, or
purge)
● 2 x groups for central control of light and all facades with 4 facade
segments each (3 of which can be delayed)
Central functions
Load central functions
on a DXR2.E/M18
Required I/Os
Required supply groups