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DTBU damper solution
If you want to run the cooker hood via the ventilation unit, in some cases there may be insufficient air for cooker hood extraction.
An EM-box solution can solve this. However, if there is insufficient space in the installation for an EM-box, the alternative may by to
connect up a DTBU damper in the duct system. It has the same function except from having no integral particle filter. You can, howev-
er, purchase a filter box with a steel filter that you can install in the duct system.
The DTBU damper regulates extraction so that less air is drawn from, for instance, the bathroom or the utility room. This will allow
enough air for the cooker hood to extract sufficiently.
The system works as follows:
When you switch on the cooker hood, User selection 1 will be activated. The ventilation unit increases ventilation and sends an output
signal to the DTBU damper that it is to close for extraction from other rooms. However, the damper does not close completely and a
reduced level of air extraction from other rooms will still take place.
The solution of connecting a DTBU damper is carried out easily by using a Nilan Fire box.
Connect User selection 1 directly to the Nilan Fire box.
Also connect up Modbus and the fire thermostat/external fire automation system through the Nilan Fire box.
You can connect up User selection 2 via S1 and S2 under fire damper connection in the Nilan Fire box.
NB! Wiring for 230V supply to DTBU damper not included.
ATTENTION
The DTBU damper solution cannot be used if the fire automation system has been activated in the software.
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