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12. External demand
12.1 Room temperature
sensor with set value
transducer
As an option, a room temperature sensor with set value transducer can be connected
to the control unit.
In the case of indoor / supply air cascade control, the room temperature is captured
by the integral room temperature sensor and via the set value transducer the set
room temperature is determined. The set value can be defaulted between 10 - 29 °C.
The room temperature sensor with set value generator can also be used in systems
with supply air temperature control. The integrated room temperature sensor can be
connected and then serves to display or release diverse special operating modes.
The programmed set point in this case is the set point for the supply air temperature.
The room temperature sensor can also be optionally connected for the display
or release of diverse special operating modes in systems with extract-supply air
cascade control. The programmed set point is then the extract air set point.
If the scale needs adjusting, proceed as follows:
- Set rotary selector, for example, to 20 °C.
- Remove the casing cover.
- Carefully pull the rotary selector from the r.h. retainer and insert it into
the l.h. retainer.
- Turn the rotary selector until 20 °C is also displayed by the
programming module (top r.h. corner).
- Carefully return the rotary selector into the r.h. retainer and close the
casing cover.
12.2 External enabling /
stage demand
External enabling:
The system can be enabled by a higher ranking control via an external zero volt
contact (e.g. switch).
The system cannot be started by an external demand if it has been shut down locally
(by using enter key on the programming module).
Special operating modes (backup mode etc.) are no longer active
when the contact is open.
External stage demand:
The fan stages (in addition to and higher ranking than the control via the
programming module) can be activated via two external zero volt contacts (e.g.
switch). The system continues to operate in automatic mode with the preset stages.
This function is effective for multi-stage and variable speed fans.
When the system is shut down, it is started with the activated stage via an external
stage demand (if this has been selected in the standard settings). The system then
operates with the set values for temperature and fresh air proportion programmed in
the standard settings.
For variable speed fans, a speed must be assigned to each stage (see page 13).
Contact 1
Contact 2
External stage demand
Open
Open
None
Closed
Open
Stage 1
Open
Closed
Stage 2
Closed
Closed
Stage 3
The stages are switched via both contacts as follows:
Please note
Please note
