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
8
8
Comfortable room temperature controller with temperature sensor
The functional scope of the room temperature controller ranges from simple heating control to
complete air conditioning of a room. The operating modes heating, cooling and heating and cooling
are available for this purpose. As control parameters, the 2-point control, a switching PI control
(PWM) or continuous PI control can be selected. The room temperature controller supports single
and dual-circuit systems in heating/cooling mode. This makes it possible to control air conditioning
systems with a common pipe system as well as systems with two separate pipe systems for heating /
cooling. The temperature is measured by a temperature sensor hidden in the outer edge of the
control panel, which detects the exact room temperature and sends it to the bus. With the
parameter Sensor internal/external, an additional measurement extension unit can be activated. If,
e.g. in large rooms, the average value of two temperatures is to be formed, the parameter is set to
50% internal / 50% external and an optimum room temperature value is obtained. If the external
sensor fails, an error message is generated and the internal sensor is set to 100%. Likewise, an upper
and lower alarm value can be activated, which outputs a 1-bit message if the value is exceeded or
undershot.
Ventilation control
The integrated ventilation control enables fans to be controlled manually in up to 4 stages, via the
control value of the temperature controller or by means of the temperature difference between
setpoint and actual value. In addition, the day/night function ensures individual adjustment of the
ventilation according to the time of day. For example, the ventilation control runs during the day in
up to 4 stages depending on requirements, while a maximum of two stages are available in night
operation to avoid disturbing noise levels and draughts. An anti-fixing function can be selected to
protect the ventilation system. The behaviour of the locking function can be specifically adjusted.
Code lock
The Central Operating Unit Smart is equipped with a code lock with a digit length of 4-6 digits. The
code lock function can be assigned to one of four possible applications. Either as a device lock, in
which case access to the entire Smart control panel is protected and can only be enabled via PIN
code or an external object. Or as key lock, here a direct operating key is locked and only executed
when the key action has been confirmed with the PIN code. Or for controlling the alarm system, here
the alarm system is activated via a direct operating button, protected via PIN code. The Smart control
panel is then completely locked. It can only be released again and the alarm system disarmed via the
PIN code. And finally to protect the time switch from unauthorised modification.
Status displays
Up to 4 status elements can be displayed in the standby mode of the control panel. These status
elements can be any values of the KNX bus, 14 byte status texts, date/time, internal room
temperature, sunrise/sunset and much more. Via the 14 byte status texts, multimedia information
such as playlist, current song, etc. can be visualised and also scrolling texts can be realised.
