User Manual

Control concept
Desigo room automation
5
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The available operating modes determine both operation and basic control strategy in the automation and
control system at three different levels:
● The room operating modes determine the operation of HVAC equipment in a room in terms of current
use by the user. The room operating modes defined for the room are available in all HVAC control
applications in the room.
● The HVAC plant operating modes determine the operation the HVAC plant in the room with regard to
existing, physical plant processes. The HVAC plant operating modes are defined specifically for 1 HVAC
plant in the room.
● The device operating modes determine the operation of the HVAC devices in a room by predefining
their tasks and implementation method. The device operating modes are defined specifically for each
individual HVAC device.
Plant and device operating modes of a plant with heating coil, cooling coil, and fan
Project-specific adaptations of both plant and device operating modes can be implemented by adapting the
operating mode table.
Plant operating mode Fan operating mode Heating coil operating mode Cooling coil operating mode
Off Off Off Off
Comfort Modulating Modulating Modulating
PreComfort Modulating Modulating Modulating
Economy Modulating Two-position Two-position
Protection Modulating Two-position Off
Heat up Modulating Two-position Off
Cool down Modulating Off Two-position
In addition, setpoints and setpoint limits define room and device operating modes. They can vary
depending on the selected HVAC plant operating mode. Four different setpoints are provided for heating
and cooling in the room.
Neither CoolingHeating
SpH SpC
100%
0%
Speed 3
Plant operating mode Economy
FanSpdMin=Off
Speed 2
Speed 1
AirFlReqHeat
TREff
AirFlReqCool
VlvPos
CclChw01
HCSta
FanSpd
VlvPos
HclHw01
FanMultiSpd01
Cool 1Heat 1 Cool 2Heat 2