Belimo LF24 US Quick Start Manual

LF24 US - Damper Actuator
On/Off, Spring Return, 24 VAC/DC
Technical Data
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
800-543-9038 USA
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
1395
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])
866-805-7089 CANADA
6.1 6.1 155] 155]
" [ " [
1.69 43] 3.66 3.66 93] 93]
" [ " [ " [
0.26 6.5]
" [
0.98 25] 4.72 120] 0.39 10]
" [ " [ " [
7.66 194.501]
" [
203-791-8396 LATIN AMERICA / CARIBBEAN