FIRE DAMPERS
366
367
Design changes reserved
BELIMO
BLF230
Damper is delivered in closed position. When electric actuator is connected to the power supply damper will open. When the damper
reaches the end position (damper open), in which is it blocked, the electromotor will stop. Closing fire damper takes place automati-
cally when a power failure occurs. Thermal tripping device that comes with fire damper causes power circuit break at a temperature
of 72 °C (inside or outside duct). If checking is needed for proper fuctioning of fire damper, pushing the switch on the thermal tripping
device will close damper. When switch on tripping device is released, the damper will open.
Damper can be opened without connecting to a voltage with enclosed handle turning in the direction of the arrow on electric acuator
(clockwise). Damper can be locked in the desired position by fast turning back handle a quarter of a turn (counterclockwise).
To unlock the electromotor, turn handle clockwise for a quarter of a turn. If the handle is released, damper will be closed by return
spring. When damper is opened manually, electric actuator will not move the damper into closed position after power failure (ther-
moelectric fuse).
switch for checking for
proper functioning
handle for manual opening
Belimo BLF24-T i BF24-T supply via
safety isolation transformer
1
negative (direct-current) or neutral (alternating current)
2
positive (direct-current) or faze (alternating current)
S1
common micro switch closed damper
S2
normally closed micro switch closed damper
S3
normally open micro switch closed damper
S4
common micro switch open damper
S5
normally closed micro switch open damper
S6
normally open micro switch open damper
Tf1
temperature sensor on the outer side of the duct (ambi-
enttemperature) max. 72°C
Tf2
temperature sensor on the inner side of the duct (tem-
perature in the duct) max. 72°C
Tf3
temperature sensor on the inner side of the duct (tem-
perature in the duct) max. 72°C
Type of Belimo actuator
BLF24-T
BLF230-T
Nominal
voltage /
power con-
sumption
voltage
AC/DC 24V, 50/60Hz
AC 230V, 50/60Hz
opening
5 W
8 W
holding
2,5 W
3 W
for wire sizing
7 VA
12,5 VA
End switch
1 mA...3 A (0,5 A),
DC 5 V...AC 250V
1 mA...3 A (0.5 A),
DC 5 V...AC 250 V
Running
time
motor
40...75 s
40...75 s
spring-return
~20 s
~20 s
Ambient temperature range
max. 50°C
S1 S2 S3 S4 S5 S6
<5°
<80°
2
1
–
+
T
~
BAE72B-S
Tf1
Tf2
Tf3 LED
Electrical characteristics and wiring scheme for Belimo electrical actuator
