Assortment / System Description

Central applications
Automation station for HVAC supply and demand signals and manual control for lighting and blinds
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Central functions permit the central override of all valve in the supply group.
The following parameters can be used.
Description Name Default value
Enable valve position overridden value
0:No
1:Yes
EnVlvPosOvrr 0:No
Enable valve position overridden value VlvPosOvrr 100 [%]
24.1.4 HVAC supply chain hot water over BACnet
The following list includes all data points that can be read and written from a
BACnet primary plant. The items ensure coordination between primary plant
and the room. In addition, appropriate Desigo primary application for the given
room function is mentioned.
Data point name Description Desigo primary application
HReq The central function prepares
one hot water demand
acquisition and evaluation to
the connected rooms for the
primary plant. The enumerate
result can include:
1:Off
2:Heating demand
3:Warm-up
PXC {HGrp65}
SpHReq Setpoint for heating request PXC {HGrp65}
HwTOa BACnet reference for primary
plant: Outside temperature of
the hot water supply chain
Data point outside temperature
of hot water supply chain
Setpoint for heating request influenced by:
● Base setpoint for heating
● Valve position(s) of heating valve in the group
Each DXR2 automation station calculates heating and cooling demand and
makes the results available via a group of the central function to the hot water
supply chain.
The hot water demand setpoint is calculated in the central function using a
heating curve based on the outside temperature.
Centrally override
valves
Setpoint for heating
request.
Heating curve based on
outside air