Mandik FDMS, Manual

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5
The damper can be equipped with electric actuating mechanism. There are several actuators: BELIMO BFL, BFN 230-T (version .40)
or BFL, BFN 24-T (version .50). After connection to the power supply AC/DC 24V or AC230V, the actuating mechanism displaces the
damper blade into operation position "OPEN". At the same time is pre-stretched back spring inside the actuator. When the actuator is
under voltage (on power supply), the damper´s blade is in the position "OPEN". The back spring is pre-stretched. Time needed for full
opening of the damper blade from the position "CLOSED" to the position "OPEN" is maximum 60s. If the power supply of the actuator
is cut off (due to disconnection of power supply, or pressing the reset button on the thermo-electrical starting mechanism BAT (thermal
fuse), the back spring displaces the damper´s blade into the safety position "CLOSED". The time needed for displacing of the blade
from the position "OPEN" to the position "CLOSE" takes maximal 20s. In the case that the power supply is restored again (the blade
can be in arbitrary position), the actuator starts re-displacing the damper´s blade position into the emergency position "OPEN". The
thermos-electrical mechanism BAT, which contains two thermal fuses Tf1 and Tf2, is a part of actuator. These fuses are activated
when tempe72°C has been exceeded. The fuse Tf1 measures the temperature in the outside of the damper and Tf2 measure
the temperature inside the air duct. Both fuses, they are in serial connection. It means in fact, that when one of them is activated, the
power supply of the actuator is cut-off and the actuator displaces the blade in safety position "CLOSED". The signalization of damper
position "OPEN" or "CLOSED" is provided by two limit switches, which are built-in inside the actuator. The thermal fuse BAT can be
also installed separately, into the spiral air duct, outside of the fire damper (order code for this option is .4V or .5V - see the product
code).
1 2 S3 S1 S2 S5 S4 S6
N L1
<5° <80°
BAT
Tf Tf LED
1 2 S3 S1 S2 S5 S4 S6
<5° <80°
BAT
Tf
Tf
LED
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