ABB i-bus
®
KNX
Parameters
AC/S 1.x.1 | 2CDC508198D0211 Rev. A 305
Room involvement
The heating curve, and therefore the supply setpoint temperature, is as standard only a
theoretical value that is exclusively dependent on the outside temperature.
By activating the "Economy mode" function the room setpoint temperatures can also flow
into the calculation; however the actual heat demand from the rooms connected to the heat
generator is not taken into account. Along with the outside temperature, the actual heat
demand is dependent on the sunlight, wind speed and internal heat loads such as people,
electrical equipment and lighting.
With room involvement, the heating curve can be raised and lowered dynamically based on
the actual room demand.
The advantage here is that at any time the optimum supply setpoint for the heating system is
used. In this way during times with low heat demand in the rooms, the heat provided is
reduced to lower the losses and therefore save energy. On the other hand, in times with
increased heat demand from the rooms, the amount of heat provided is increased. In this
way the required comfort temperature is reached more quickly in the rooms.
The current heat demand from the rooms is determined by evaluating the control values
from the room thermostats (e.g. radiator valve position). For this purpose an input socket is
displayed to link the control values. The module determines the highest value from the
control values linked.
Based on the parameters that follow, the module raises or lowers the heating curve and
therefore the supply setpoint temperature over a longer period until the optimum control
value is reached. Here the highest control value is always taken as the reference. If the
control value leaves the optimum value, the adaptation starts again from the beginning.
The current adaptation of the heating curve is displayed on the web user interface for the
module. The calculation takes place every 5 minutes.
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