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Technical Manual
–
Central Operation Unit Smart
MDT technologies GmbH •
51766 Engelskirchen • Papiermühle 1
Phone: +49-2263-
880 • Fax: +49-2263-4588 • [email protected] • www.mdt.de
55
55
Dead zone
If the control mode is set to heating and cooling, a parameter for the dead zone between heating and
cooling is displayed:
ETS-Text
Dynamic range
[Default value]
Comment
Dead zone between heating
and cooling (K)
1,0 K
–
10,0 K
[2,0 K]
Setting range for the dead zone (range
in which the controller activates neither
the heating nor the cooling process)
Table 52: Settings - Dead zone
The settings for the dead zone are only possible if the controller type is set to heating and cooling. As
soon as this setting is made, the dead zone can be parameterised.
The dead zone is the area in which the controller does not activate either the heating or cooling
process. Consequently, the controller does not send any value to the control value in the area of the
dead zone and therefore the control value remains switched off. When setting the dead zone, please
note that a low value leads to frequent switching between heating and cooling, whereas a high value
leads to a large fluctuation of the actual room temperature.
If the controller is set to heating and cooling, the basic comfort value always forms the setpoint for
the heating process. The setpoint for cooling is calculated by adding the base comfort value and the
dead zone. So if the base comfort value is set to 21°C and the dead zone to 3K, the setpoint for the
heating process is 21°C and the setpoint for the cooling process is 24°C.
The dependent setpoints for heating and cooling, i.e. those for the standby and night operating
modes, can again be parameterised independently of each other in the controller mode Heating and
Cooling. The setpoints are then calculated as a function of the basic comfort value, the setpoint for
the comfort operating mode, for the heating and cooling process.
The setpoints for heat and frost protection are independent of the settings for the dead zone and the
other setpoints.
The following diagram shows again the relationship between dead zone and the setpoints for the
individual operating modes:
The following settings were selected for this example:
Basic comfort value: 21°C
Dead zone between heating and cooling: 3K
Increase and reduction Standby: 2K
Increase and reduction Night: 4K