Description Belimo LR24A-SR Modulating Rotary Actuator – 5 Nm, 24V
The Belimo LR24A-SR
This actuator is part of Belimo’s renowned product family, trusted globally for their reliability, durability, and advanced technical performance. By incorporating the LR24A-SR into your system, you benefit from proven engineering, reduced maintenance requirements, and energy efficiency.
Key Features of the Belimo LR24A-SR
5 Nm torque output for accurate control of ball valves in HVAC systems.
Modulating control signal 0…10 V for precise positioning.
Position feedback 2…10 V for monitoring and coordination with other devices.
Compact and lightweight design with a weight of only 0.48 kg.
Low noise level at just 35 dB(A), ideal for noise-sensitive environments.
Manual override with push-button for easy intervention and system testing.
Maintenance-free construction with overload protection and no need for limit switches.
Universal mounting directly on ball valves with central screw and selectable orientation in 90° steps.
Technical Data
Electrical Data
Nominal Voltage: AC/DC 24 V
Voltage Frequency: 50/60 Hz
Voltage Range: AC 19.2…28.8 V / DC 19.2…28.8 V
Power Consumption (Operation): 1.5 W
Power Consumption (Rest): 0.4 W
Power Consumption (Wire Sizing): 3 VA
Connection Supply/Control: 1 m cable, 4 x 0.75 mm²
Parallel Operation: Supported (performance data must be observed)
Functional Data
Torque Motor: 5 Nm
Operating Range (Y): 2…10 V
Input Impedance: 100 kΩ
Position Feedback (U): 2…10 V (max. 1 mA)
Position Accuracy: ±5%
Running Time: 90 s / 90°
Sound Power Level: 35 dB(A)
Manual Override: Push-button, lockable
Position Indication: Mechanical, pluggable
Safety Data
Protection Class: IEC/EN III, Safety Extra-Low Voltage (SELV)
UL Power Source: Class 2 Supply
Degree of Protection: IP54 / NEMA 2
EMC Compliance: CE 2014/30/EU
Certification: IEC/EN 60730-1 and IEC/EN 60730-2-14
UL Approval: cULus according to UL60730-1A and UL60730-2-14, CAN/CSA E60730-1
Type of Action: Type 1
Rated Impulse Voltage: 0.8 kV
Pollution Degree: 3
Environmental Data
Ambient Temperature: -30…50°C
Storage Temperature: -40…80°C
Ambient Humidity: Up to 95% RH, non-condensing
Servicing: Maintenance-free
Weight: 0.48 kg
Product Benefits
Precision Control
The Belimo LR24A-SR actuator provides continuous modulating control, allowing the ball valve to be adjusted to any position required by the system. This ensures accurate water or air regulation, optimising comfort, efficiency, and energy savings.
Compact and Versatile Design
With its small size and light weight, the LR24A-SR is ideal for installations where space is limited. It mounts directly on ball valves using a central screw and can be oriented in 90° steps, offering flexibility during installation.
Ease of Use
The actuator is equipped with a manual override push-button , which disengages the gear train when pressed. This feature makes commissioning and troubleshooting simple, allowing engineers to manually position the valve without additional tools.
Reliability and Safety
Belimo’s actuators are known for their maintenance-free operation . The LR24A-SR includes built-in overload protection, ensuring long service life without the need for external limit switches. Its IP54 protection rating ensures it is safeguarded against dust and splashing water, making it reliable even in demanding conditions.
Accessories
A wide range of accessories is available to expand the functionality of the LR24A-SR:
Auxiliary Switches :
S1A (1 x SPDT add-on)
S2A (2 x SPDT add-on)
Feedback Potentiometers :
P140A (140 Ω)
P200A (200 Ω)
P500A (500 Ω)
P1000A (1 kΩ)
P2800A (2.8 kΩ)
P5000A (5 kΩ)
P10000A (10 kΩ)
These accessories make the actuator adaptable for different control strategies and feedback requirements.
Installation and Electrical Setup
The actuator requires supply from an isolating transformer. Parallel connection with other actuators is possible, provided that the performance data is observed. The rotation direction switch is covered, with the factory setting as Y2. The direct mounting method ensures a secure and straightforward connection to ball valves, reducing installation time and labour costs.
Applications in HVAC Systems
The Belimo LR24A-SR rotary actuator is used in HVAC systems where precise control of ball valves is required. Typical applications include:
Chilled water circuits for cooling systems.
Heating systems where accurate water flow control is critical.
Ventilation systems requiring consistent airflow management.
Industrial process control where precise valve regulation ensures efficiency.
By enabling modulating control, the LR24A-SR contributes to improved system stability, reduced energy use, and greater occupant comfort.
Why Choose the Belimo LR24A-SR?
Compact design makes it easy to install in tight spaces.
Modulating control improves accuracy and efficiency compared to on/off actuators.
Position feedback allows integration with advanced building automation systems.
Maintenance-free operation reduces lifecycle costs.
Backed by Belimo’s reputation for quality and innovation.
Related Products
Belimo NM24A-SR – 8 Nm rotary actuator
Belimo LM24A-SR – 5 Nm compact actuator
Belimo SM24A-SR – 20 Nm damper actuator
About Us
At Eco Spares, we specialise in supplying reliable HVAC components and accessories throughout the UK. Our product range includes actuators, valves, controls, and spare parts sourced directly from leading manufacturers.
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