Belimo LF24 US User Manual

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 Aircontrols (USA), Inc.

Belimo LF24 US Specifications

General

Power Supply	24 VAC/DC
Power Consumption Running	2.5 W
Housing Material	UL94-5VA
Angle of Rotation	95°
Voltage	24 VAC/DC
Control Type	On/Off
Running Time	90 s
Protection Class	IP54
Overload Protection	Electronic throughout full stroke
Ambient Temperature Range	-22°F to +122°F (-30°C to +50°C)
Agency Listings	cULus acc. to UL60730-1/-2-14, CAN/CSA E60730-1/-2-14, CE acc. to 2014/30/EU and 2014/35/EU
Servicing	Maintenance free
Type	Actuator
Control Signal	On/Off
Electrical Connection	3 ft
Mounting	Direct mounting on actuator

Summary

Technical Data

Power Specifications

Details electrical power requirements, including supply voltage, running and holding consumption, and transformer sizing.

Mechanical and Performance Data

Covers shaft diameter, electrical connection, overload protection, rotation angle, torque, and running times for motor and fail-safe.

Environmental and Safety Ratings

Includes humidity, ambient/storage temperature ranges, housing rating, agency listings, and noise levels.

Application and Operation

Application Overview

Describes the actuator's use for On/Off, fail-safe control of HVAC dampers, including sizing and mounting.

Operating Principles

Explains the true spring return operation, torque consistency, rotation range, stall capability, and reduced power consumption.

Dimensions and Accessories

Product Dimensions

Provides a diagram with detailed measurements for the actuator in inches and millimeters.

Available Accessories

Lists various accessories for shaft extension, mounting, and control, such as clamps, ball joints, and brackets.

Specifications and Wiring

Typical Specification Requirements

Defines requirements for direct coupling, fail-safe operation, torque, rotation, overload protection, and agency approvals.

Wiring Diagrams and Safety

Illustrates wiring connections and provides critical safety warnings for working with live electrical components.