Belimo LF24-SR US Actuator 24 vac/dc Spring Return

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The LF24-SR is used for proportional modulation of dampers and control valves in HVAC systems. The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500W resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication or master-slave applications.

-10 min. installation simple direct coupling. Actuator Centers on 1/2" shaft (K6-1, 3/4" clamp optional).
-Mechanical spring return - the most reliable
-Clockwise or Counterclockwise Mount
-Easy-to-adjust mechanical stop to limit damper rotation.


Power Supply  24 VAC/DC
Torque 35 lb-in
Running Time 150 Seconds (motor)
< 25 Seconds @ 4°F to 122°F (spring)
< 60 Seconds @ -22°F (spring)
Power Consumption 2.5W (running), 1W (holding)
Control Input Values 2 to 10 VDC 4 to 20 mA
Auxiliary Switch No Switch
Manual Override None