The Belimo LF24 US LF Damper Actuator is designed for On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. On/Off control from an auxiliary contact, digital output, or a manual switch. The LF24 US is mounted directly to a damper shaft, measuring between 3/8” up to 1/2” in diameter, by means of its universal clamp, with 1/2” shaft centered at delivery. For shafts up to 3/4” use K6-1 accessory. A crank arm and several mounting brackets are available for other applications.
The LF24 US actuator provides true spring return operation for reliable fail-safe application and positive close off on air tight dampers. The spring return system provides consistent torque to the damper with, and without, power applied to the actuator. Also provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°.
Product Specifications
| Control Input Values |
On/Off |
| Ambient Temperature |
-22°F to +122°F [-30°C to +50°C] |
| Weight |
3.1 lbs (1.40 kg) |
| Auxiliary Switch |
No Switch |
| Electrical Connection |
3 ft, 18 GA appliance cable, 1/2"
conduit connector |
| Power Consumption |
running: 5 W, holding: 2.5 W |
| Power Supply |
24 VAC/DC |
| Va Rating |
7 VA |
| Noise Level |
less than 50 dB(A) running, spring
return less than 62dB(A) |
| Servicing |
Maintenance free |
| Shaft Diameter |
3/8" to 1/2" (standard), 1/2" to 3/4"
with K4-1 clamp acc. |
| Housing |
NEMA 2 / IP54 |
| Housing Material |
zinc coated steel |
| Angle of Rotation |
max. 95°, adjustable with mechanical
stops |
| Direction of Rotation |
spring return can be selected by CW/CCW
mounting |
| Manual Override |
None |
| Minimum Torque (in-lb) |
35 |
| Running Time (motor) |
< 40 to 75 sec. |
| Overload Protection |
electronic throughout 0 to 95°
rotation |
| Spring Return Fail Safe |
yes |
| Quality Standards |
ISO 9001 |
| Humidity Rating |
5 to 95% RH non-condensing |
| Storage Temperature |
-40°F to +176°F [-40°C to +80°C] |
| Running Time (Spring) |
<25 sec @ -4°Fto122°F[-20°Cto50°C] <60
sec @ -22°F[-30°C] |
| Cable Option |
3 feet |
| Agency Listing |
cULus, CE |
