Assortment / System Description

Central applications
Automation station for HVAC supply and demand signals and manual control for lighting and blinds
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Sp Setpoint
TOa Outside temperature
SpTFlDs Flow temperature setpoint for design outside
temperature
70 [°C]
TOaDsgn Design outside temperature -11 [°C]
SpTFlHi Flow temperature setpoint for high outside
temperature
25 [°C]
TOaHi Outside temperature high 15 [°C]
Figure: Characteristic curve for the outside temperature-dependent heating
curve
The heating request setpoint is influenced by the evaluation of valve positions.
HwVlvPosEvl Supply chain hot water valve position evaluation
▶Average of the largest valve position
HwSpCorrTFlHi Supply chain hot water setpoint correction for higher flow temperature
HwSpCorrTFlLo Supply chain hot water setpoint correction for lower flow temperature
Figure: Setpoint heating request
The central function can disable the hot water equipment in the rooms based
on outside temperature. The heating sequences in the group are locked as soon
as the configured value for the outside temperature is reached.
Description Name Default value
Heating limit HLm 16 [°C]
Time constant for heating limit TiConHLm 2 [h]
Hysteresis for heating limit HysHLm 1 [K]
Valve actuators are operated from time to time to prevent them from seizing
after long periods of inactivity (e.g. heating valve during the summer). The valve
actuator is controlled to lose as little heating energy as possible.
The central function for the hot water supply chain performs the valve
protection function and can be changed in the parameters as needed.
Description Name Default value
Kick value KickVal 50 [%]
Kick time TiKick 2 [Min]
Kick cycle KickCyc 500 [h]
Disable
hot water sequences
Valve protection