5
Design with actuating mechanism
The dampers are equipped with Belimo actuating mechanisms with back spring and thermoelectric
actuating device, of range BFL (hereinafter referred to only as the "actuating mechanism"). After
being connected to power supply AC/DC 24V or AC 230V, respectively, the actuating mechanism
moves the damper blade to "OPEN" operation position and at the same time pre-stretches its back
spring. While the actuating mechanism is under voltage, the damper blade is in the "OPEN" position
and the back spring is pre-stretched. The time needed for full opening of the damper blade from
"CLOSED" position to "OPEN" position is 60 seconds at the maximum. if the power supply to the
actuating mechanism is cut off (due to loss of power supply or by pressing the reset button on the
BAT thermoelectric starting mechanism), the back spring will move the damper blade to "CLOSED"
failure position. The time of moving the blade from "OPEN" position to "CLOSED" position takes 20
seconds at the maximum. If the power supply is restored (the blade can be in any position), the
actuating mechanism starts to move the damper blade to "OPEN" position again.
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" and "CLOSE" is provided by two limit switches.
BAT
1(COM) - black wire
2(NC) -
gray wire
4(NO) -
blue wire
AC 230V / 5A
IP 67
-25°C … +120°C
This limit switch is possible to connect in following two versions:
a)
if the arm is moving … connect wire 1+2
b)
if the arm is moving … connect wire 1+4
Actuating
mechanism
