Damper Design - Mandik FDMC Manual

Operation of the dampers does not depend on the direction of air circulation. The dampers can
be located in an arbitrary position.
Dampers are suitable for systems without abrasive, chemical and adhesive particles.
Dampers are designed for macroclimatic areas with mild climate according to EN 60 721-3-3.
Temperature in the place of installation is permitted to range from - 30°C to + 50°C.
Design with actuating mechanism
FDMC is always equipped by electric actuating mechanism BFL (further only "actuating
mechanism"). After being connected to power supply AC/DC 24V or 230V, the actuating
mechanism displaces the damper blade into operation position "OPEN" and at the same time it
pre-stretches its back spring. When the actuating mechanism is under voltage, the damper blade
is in the position "OPEN" and the back spring is pre-stretched. Time needed for full opening of the
flap blade from the position "CLOSED" to the position "OPEN" is maximum 60 sec. If the actuating
power supply is cut off (due to loss of supply voltage, or pushing the reset button on the
thermoelectrical starting mechanism BAT), the back spring displaces the damper blade into the
breakdown position "CLOSED". The time of displacing the blade from the position "OPEN" to the
position "CLOSED" takes maximum 20 sec. In case that the power supply is restored again (the
blade can be in any position), the actuating mechanism starts to re-displace the damper blade
into the position "OPEN".
A thermoelectrical starting mechanism BAT, which contains two thermal fuses Tf1 and Tf2, is a
part of the actuating mechanism. These fuses are activated when temperature +72 °C has been
exceeded (the fuse Tf1 when the temperature around the damper and the fuses Tf2 when the
temperature inside the air-conditioning piping has been exceeded). After the thermal fuse Tf1 or
Tf2 has been activated, the power supply is permanently and irreversibly cut off and the actuating
mechanism, by means of the pre-stretched spring, displaces the damper blade into the
breakdown position "CLOSED".
Signalisation of damper blade position "OPEN" a "CLOSE" is provided by two limit switches.
BAT
Actuating mechanism
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