3
Park Allé 366, DK-2605 Brondby
Telefon 70 20 19 11; E-mail:[email protected]
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 - 20°C to + 50°C.
FDMC is always equipped by actuating mechanism BFL 24-T (further only "actuating mecha-
nism"). After being connected to power supply AC/DC 24V, 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 140s. If the actuating power supply
is cut off (due to loss of supply voltage, activation of thermoelectrical actuating mechanism 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 16 s. 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 three 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-condition-
ing 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".
Dimensions
POSITION:
1
Damper body
2
Damper blade
3
Actuating mechanism
4
BAT thermoelectrical starting mechanism
5
Inspection hole covering
420
50
50
D
160
55
8
0
Summary of Contents for FDMC Series
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