background image

Technical Data

1395

Power Supply

24 VAC ± 20%, 50/60 Hz, 24 VDC ± 10%

Power Consumption Running

5 W 

Power Consumption Holding

2.5 W 

Transformer Sizing

7 VA (class 2 power source)

Shaft Diameter

3/8” to 1/2” round, centers on 1/2”

Electrical Connection

3ft [1m], 18 GA appliance cable with 1/2” 

conduit connector

Overload Protection

electronic throughout 0° to 95° rotation

Electrical Protection

actuators are double insulated

Angle of Rotation

Max. 95°,

Torque

35 in-lbs [4 Nm] minimum

Direction of Rotation (Motor)

reversible with CW/CCW mounting

Direction of Rotation (Fail-Safe) reversible with CW/CCW mounting
Position Indication

visual indicator, 0° to 95°  (0° is full spring 

return position)

Running Time (Motor)

<40 to 75 sec

Running Time (Fail-Safe)

<25 sec @ -4°F to 122°F [-20°C to 50°C], < 

60 sec @ -22°F [-30°C]

Humidity

max. 95% RH non-condensing

Ambient Temperature Range

-22°F to 122°F [-30°C to 50°C]

Storage Temperature Range

-40°F to 176°F [-40°C to 80°C]

Housing

NEMA 2, IP54

Housing Material

zinc coated steel

Agency Listings†

cULus acc. To UL 873 and CAN/CSA C22.2 

No. 24-93

Noise Level (Motor)

<50 dB (A) 

Noise Level (Fail-Safe)

<62 dB (A) 

Servicing

maintenance free

Quality Standard

ISO 9001

Weight

3.1 lb [1.4 kg]

†Rated Impulse Voltage 800V, Type of action 1.AA, Control Pollution Degree 3

Torque min. 35 in-lb, for control of air dampers.

Application

For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing 

should be done in accordance with the damper manufacturer’s specifications. 

Control is On/Off from an auxiliary contact or a manual switch. The actuator is 

mounted directly to a damper shaft from 3/8” up to 1/2” in diameter by means 

of its universal clamp, 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 
applications where the actuator cannot be direct coupled to the damper shaft.

Operation

The LF series actuators provide 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. The LF series provides 95° of rotation and is provided with a 

graduated position indicator showing 0° to 95°. The actuator may be stalled 

anywhere in its normal rotation without the need of mechanical end switches. 

Power consumption is reduced in holding mode. The actuator is double 

insulated so an electrical ground connection is not necessary.

Dimensions (Inches[mm])

2.74" 

[

69.6]

2.25" 

[

57.1]

0.73" 

[

18.54]

3.23" 

[

82]

0.25" 

[

6.25]

1.15" 

[

29.3]

2.3" 

[

58.42]

3.15" 

[

80]

7.66

" [

194.501] 

0.2" 

[

5.08

]

0.98

" [

25] 

4.72

" [

120] 

0.39

" [

10] 

0.97" 

[

24.6]

3.86" 

[

98]

1.69

" [

43] 

3.66

" [

93] 

6.1

" [

155] 

3.66

" [

93] 

6.1

" [

155] 

0.26

" [

6.5] 

LF24 US - Damper Actuator

On/Off, Spring Return, 24 VAC/DC

800-543-9038

 USA

866-805-7089

 CANADA

203-791-8396

 LATIN AMERICA / CARIBBEAN

Date created, 02/16/2017 - Subject to change. © Belimo Air

controls (USA), Inc.

Reviews: