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• The "Switching-over between heating and cooling" parameter on parameter page "Controller functions" is set
to "via object":
Independent of the dead zone, the control option is then controlled via the "Control option switch-over" object
35. This type of switch-over may be required, for example, in case of heating and cooling via a single-duct
system (combined heating and cooling system). For this purpose, the temperature of the medium in the single-
duct system must be changed beforehand by the system control. Afterwards, the control option is set via the
object (often the single-duct system uses cold water for cooling during the summer, hot water for heating
during the winter).
The "Control option switch-over" object has the following polarity: "1": heating; "0": cooling. After a reset, the
object value "0" and the "Control option heating/ cooling after reset" parameter will be activated.
The "Control option heating / cooling after reset" parameter determines which control option will be activated
after a reset. The "heating" or "cooling" setting causes the controller to activate the parameterized control
option directly after the initialization phase. Setting the "Control option before reset" parameter will activate the
control option that was selected before the reset.
If a switch-over takes place via the control option object, the controller will first switch-over into a control option
that was set after the reset. The controller will switch-over, if applicable, into the other control option only after
the device has received an object update.
Notes on the "control option before reset" setting:
• Frequent adjustments of the control options during ongoing operation (e.g. several times a day) may affect
the product life of the device as in this case the non-volatile storage (EEPROM) is only designed for less
frequent write access.
Heating / cooling message:
Depending on the selected control option it is possible to output the information via separate objects whether
heating or cooling energy is currently required, i.e. whether heating or cooling operation is in progress.
As long as the actuating variable for heating (cooling) is > "0", a "1" telegram is transmitted via the "heating"
("cooling") signalling object. The message telegrams will be reset only if the actuating variables = "0" ("0" telegram
will be transmitted).
Exception: In case of a 2-state control, the LEDs "heating" or "cooling" will light up or the signalling objects for
heating and cooling will already become active as soon as the temperature falls short of the temperature setpoint
in case of heating or exceeds the temperature setpoint in case of cooling. In this case, the parameterized
hysteresis is not being considered.
Heating and cooling at the same time is not possible!
The signalling objects may be enabled via the "Heating message" or the "Cooling message" parameter on the
"Actuating variable and status output" parameter page.
The signalling objects are controlled by the control algorithm. It has to be considered that the actuating variable is
calculated only every 30 seconds (thus updating the signalling objects every 30 seconds).
07/17
Subject to change without notice
instabus KNX/EIB System
Sensor
2100-xx/2101 xx Page 35/82
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