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DTBU (damper option)
Fire thermostat / external fire automation system
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.
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 ex-
tract air from the other rooms. However, the damper does not close com-
pletely 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 PCB board via the electrical dia-
gram.
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 port can be used for con-
nection of an external fire automation system.
The control system identifies a broken input signal as fire, and stops. It will only
restart once connection to the fire thermostat has been established or the ex-
ternal fire automation system starts signaling again. This must be done manual-
ly via the control panel.
When you connect up an external fire automation system, it will be necessary for
the ventilation unit to restart automatically. You can set for this to happen on
the control panel. Please consult the software instructions for further informa-
tion.
The connection is made on the expansion PCB via the electrical diagram.
ATTENTION
If this function is not used, a jumper must be established on the expansion PCB. Otherwise there will be a fire alarm in
the control system.
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