17
Operation and mechanisms
BFN(T) Remotely controlled spring return actuator
The spring return actuator BFN(T) is specially designed to remotely control fire dampers. The BFN(T) model is intended for fire
dampers with large dimensions (ø > 400 mm (CR2) or W+H > 1200 mm (CU2, CA2, CU2-15, CU4)) or for dampers CU-LT(-1s), CR60,
CR120 with a production date before 1 July 2015.
1. locking button
2. plug (ST)
3. access for manual resetting
4. thermo-electric tripping device (T)
1
3
4
2
Options - at the time of order
SN2 BFL/BFN
Auxiliary limit switch ‘open/closed’
IXI-R1
Universal field module (Modbus, BACnet or analog connection), pre-mounted on the damper.
IXI-R2-24
Universal field controller (Modbus, BACnet), pre-mounted on the damper and with a connection for a second damper.
IXI-R2-230
Universal field controller (Modbus, BACnet), pre-mounted on the damper and with a connection for a second damper.
Unlocking
∎
manual unlocking
: place the locking button on “unlock”. (In case of BFNT: 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 BFNT).
∎
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).
Caution:
The mechanism may never be tested on its own, without being attached to the damper. Such a test might damage the
mechanism or the operator might be injured.
prod. < 1/7/2015
prod. ≥ 1/7/2015
CR60(1s)
CR120
CU-LT
CU-LT-1s
CR2≤400
CU2≤1200
CR2>400
CU2>1200
CR60(1s)
CR120 (1s)
CU-LT
CU-LT-1s
CR2≤400
CU2≤1200
CR2>400
CU2>1200
Kit BFL
Kit BFN
Kit BF
