Belimo LF24-SR US Manuals

Wiring for Damper Actuators and Control Valves July 2011

Technical Data 1405 Power Supply 24 VAC, ±20%, 50/60 Hz, 24 VDC, ±10% Power Consumption Running 2.5 W Power Consumption Holding 1 W Transformer Sizing 5 VA (class 2 power source) Shaft Diameter 3/8” to 1/2” round, centers on 1/2” Electrical Connection 3ft [1m], 18 GA plenum cable with 1/2” conduit connector Overload Protection electronic throughout 0° to 95° rotation Electrical Protection actuators are double insulated Operating Range Y 2 to 10 VDC, 4 to 20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor) Input Impedance 100 k Ω for 2 to 10 VDC (0.1 mA), 500 Ω for 4 to 20 mA Feedback Output U 2 to 10 VDC (max 0.7 mA) for 95° Angle of Rotation Max. 95°, Torque motor Min. 35 in-lbs [4 Nm] Direction of Rotation (Motor) reversible with built-in switch 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) 150 sec Running Time (Fail-Safe) <25 sec @ -4°F to 122°F [-20°C to 50°C], <60 sec @ -22°F [-30°C] Ambient 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) <30 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 fail-safe, modulating control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. 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. The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500Ω 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. 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 LF24-SR US uses a brushless DC motor which is controlled by an Application Specific Integrated Circuit (ASIC) and a microprocessor. The microprocessor provides the intelligence to the ASIC to provide a constant rotation rate and to know the actuator’s exact fail-safe position. The ASIC monitors and controls the brushless DC motor’s rotation and provides a digital rotation sensing function to prevent damage to the actuator in a stall condition. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. Power consumption is reduced in holding mode. 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-SR US - Damper Actuator Modulating, Spring Return, 24 VAC/DC, for 2 to 10 VDC or 4 to 20 mA Control Signal 800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN Date created, 11/29/2017 - Subject to change. © Belimo Aircontrols (USA), Inc.

Actuators for heating, ventilation, air conditioning 2. LF-2-CD Product Information Damper actuators with spring return LF B C i0067712