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Technical Manual – Room Temperature Controller SCN-RT1
The dynamic range for an additional level is shown at the following chart (the setting options are
shown, when an additional level is activated):
ETS-text
Direction of controller
Control value
Distance (in K)
Table 38: Additional level
An additional level can only be chosen for heating. The direction of the controller can be chosen for
the additional level, too. The control value can be chosen as PI-control switching (PWM) or 2-Step
control. So the communication object for the additional level has always the size of 1 Bit.
The distance in K describes the setpoint of the additional level. The adjusted distance is deducted
from the setpoint of the basic level; the resulting value is the setpoint for the additional level.
Example: The controller has the operating mode comfort, with the basic comfort setpoint of
21°C. The distance is adjusted as 2,0K. So the setpoint for the additional level is 21°C-
2,0K=19,0°C.
An additional level can be used at carry systems to reduce the warm up time. For example can a
radiator be used as additional level for reducing the war up time of an underfloor heating.
The following chart shows the relevant communication object:
Number
Name
9
Control value additional
heating
Table 39: Communication object additional level
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40
Phone: +49-2263-880 • Fax: +49-2263-4588 • knx@mdt.de • www.mdt.de
Dynamic range
[default value]
▪ normal
▪ inverted
▪ 2-Step control (switching)
▪ PI control switching (PWM)
1,0K – 10,0K
[2,0K]
Length
Usage
1 Bit
control value for the additional level
comment
indicates the controlling behavior at
rising temperature (4.5.5)
Setting of the used control value
Distance between the setpoints of the
normal controlling and the setpoint for
the additional level
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