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DTBU (damper option)
The system works as follows:
When the cooker hood is switched on, User selection 2 is activated. The ventilation unit increases the ventilation and at the same time
sends an output signal to the DTBU damper that it must close the damper for extract air from the other rooms. However, the damper
does not close completely in, there will still be extraction from the other rooms, just reduced.
When balancing, the small stop blocks on the damper must be set so that the basic ventilation is maintained from the other rooms.
The DTBU damper is connected to the 8-pin plug. Pin 2: User Selection 2 and Pin 4: GND. The relay output is connected in the 6-pin ter-
minal block. Terminal 4: User selection 2 (Output) and Terminal 5: N (Output) as shown in User selection 2.
Fire thermostat / external fire automation system
The ventilation unit can be connected up to an external fire thermostat that will stop the ventilation unit in the event of fire. The same
input port can be used for connecting an external fire automation system.
The control system registers any disruption of the input signal as fire, and stops. It will only restart once connection to the fire thermo-
stat has been reestablished or the external fire automation system starts signalling again. This must be done manually via the control
panel.
When you connect up an external fire automation system, you will need the ventilation unit to restart automatically. You can set for
this to happen on the control panel. Please consult the software instructions for further information.
The connection is created via a terminal block that is located at the top of the unit. The connection to the terminal block is carried out
at the back of the cover plate. You then run the wires through one of the cable glands.
If it is desired to run the cooker hood over the ventilation system, it may in some cases be difficult
to get enough air for the cooker hood.
To solve that challenge, an EM-box solution can be used. However, if there is not enough space in
the installation for an EM box, you can alternatively connect a DTBU damper in the duct system,
which has the same function, except that it does not have a built-in dirt filter. However, a filter box
with a steel filter can be purchased, which can be mounted in the duct system in a suitable place.
The DTBU damper regulates the extract air so that less air is extracted out of the other rooms, e.g.
bathroom and utility room so that there is enough air for the cooker hood to extract sufficiently.
Connection in the 7-pin terminal block
Terminal 4: GND
Terminal 7: Fire thermostat / external
fire automation system
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