Belimo BF24TL-TN-ST
Spring-return actuator for fire and smoke dampers in ventilation and air-conditioning systems. During operation, the motor moves the damper to its operating position and tensions the return spring. If the power supply fails or the thermal release trips, the spring moves the damper to its safety position.
Key features
- Motor torque: 18 Nm; safety function torque: 12 Nm.
- Supply: AC/DC 24 V, 50/60 Hz; power consumption during movement: 8 W, in rest position: 3.5 W; wire sizing power: 11 VA.
- Close/Open control with communication interface; integration with LONWORKS® or BELIMO MP-Bus via a communication and power supply unit.
- Motor running time: <120 s / 90°; safety function running time: 16 s @ 20°C.
- BAT thermal release: fuse trip temperature on the outside and inside of the duct: 72°C.
- Mechanical connection: 12x12 mm form-fit connection, non-through hollow shaft; motor direction selected by L/R mounting.
- Manual override with position stop and mechanical position indicator.
- Auxiliary switches: 2x SPDT; degree of protection: IP54; IEC/EN protection class III, Safety Extra-Low Voltage (SELV).
- Power and control connection: 1 m cable with plug, 4x 0.75 mm², halogen-free; 4-pin plug compatible with BKN230-24LON and BKN230-24MP.
Supplied with: hand crank, indicator, protective cover and insert for the 12/10 mm form-fit connection. The actuator is adapted to the damper and installed by its manufacturer.
