Belimo LF24 - rotary actuator for dampers with safety function

Belimo LF24 actuator

A rotary actuator with a safety function for positioning dampers in stationary heating, ventilation and air conditioning installations. According to the technical data sheet, it is designed for air dampers with an area of up to approx. 0.8 m².

Key features and specifications

• Motor and safety function torque: 4 Nm.
• Nominal voltage: AC/DC 24 V; frequency: 50/60 Hz.
• Control: On/Off.
• Power consumption while running: 5 W; at rest: 2.5 W; wire sizing power: 7 VA.
• Motor running time: 75 s / 90°; safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Rotation angle: max. 95°; adjustment by means of an integrated mechanical stop.
• Mechanical connection: universal clamp 8...16 mm; power and control connection: 1 m cable, 2x 0.75 mm².
• Position indication: mechanical; manual override: no.
• Protection rating: IP54; ambient temperature: -30...50°C [-22...122°F].

During operation, the actuator moves the damper while tensioning the return spring. When the power supply is interrupted, the spring energy moves the damper to the safety position. The direction of motor and safety-function movement can be selected by L/R mounting.