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Operation and mechanisms
BFL(T) Remotely controlled spring return actuator
The spring return actuator BFL(T) is especially designed to operate fire dampers remotely. The BFL(T) variant is intended for fire
dampers with smaller dimensions (CR60, CR120, CR2 with ø ≤ 400 mm, CRS60 with ø ≤ 315 mm, CU2 / CU2-15 / CU4 with B+H ≤
1200 mm or for CU-LT and CU-LT-1s). For Markage FD with H = 200 mm or H = 2200 mm (in combination with BFT motor).
1. locking button
2. plug (ST)
3. access for manual resetting
4. thermo-electric tripping device (T)
1
3
4
2
Unlocking
∎
manual unlocking
: place the locking button on “unlock”. (In case of BFLT: the damper can alternatively be unlocked by pushing
the “test” button on the thermo-electric fuse)
∎
automatic unlocking
: the thermo-electric fuse reacts as soon as the temperature reaches 72°C (type BFLT).
∎
remote unlocking
: by interrupting the power supply.
Caution:
The thermo-electric fuse will not move the damper into its safety position (when the temperature reaches 72°C) if the motor
is not powered.
Resetting
∎
manual resetting
: turn the enclosed handle anti-clockwise. To block the motor, place the locking button on “lock”
∎
motorised resetting
: switch off the power supply for at least 10 seconds. Supply the actuator (respect the prescribed voltage) for
at least 75 seconds. The resetting stops automatically when the end of range is reached (damper open) - it takes about 60 seconds
to reset the damper - or when the power supply is interrupted.
Caution:
Do not use a drill or powered screwdriver.
Stop as soon as the motor is completely rearmed (end of range).
