Belimo modulating valve actuator with spring return 24V - 2-10V - MP-Bus - 4 Nm - LF24-SR

Brand: Belimo

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RRP 374.76

337.28 -10%

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Delivery time: 7 working days

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Good points

Incl. spring return
Open/close, 3-point and MP-Bus
Wi-Fi control
IP54 protection class

Belimo Modulating Actuator with Spring Return 24V - 2-10V - MP-Bus - 4 Nm - LF24-SR

The Belimo LF24-SR is a versatile spring return actuator designed for controlling damper sections in technical building installations. The actuator is operated with a 2-10 V control signal and also provides a 2-10 V feedback signal to the controller or cascade control system. Based on an external measurement signal—such as from a sensor monitoring a relevant parameter like temperature, pressure, or air quality—a control signal is generated that instructs the Belimo motor to adjust the damper position. In addition to modulating control, the actuator also supports on/off, 3-point, and communication control via MP-Bus, making it suitable for both simple and complex building automation systems. In case of power failure, the damper automatically returns to the safe position using spring energy. The motor runtime can be adjusted between 75 and 300 seconds, and the spring return moves the damper back in less than 20 seconds. With a torque of 4 Nm, a standby power consumption of just 0.8 W, and an exceptionally low noise level of 36 dB(A), it is ideal for smaller damper assemblies in commercial and residential installations.

Benefits and Features

Multiple operating modes: The actuator supports modulating (2–10 V), on/off, 3-point, and MP-Bus communication control, allowing a single actuator to be used across various control scenarios without additional hardware.
MP-Bus communication: Up to 16 actuators can be controlled via one shared 3-core cable over MP-Bus, significantly reducing cabling costs and installation time.
2–10 V position feedback: Electrically outputs the actual damper position for use in control strategies such as cascade systems or building management systems (BMS).
Automatic spring return on power loss: The damper returns to the safety position within 20 seconds without requiring an external power source or control signal.
Exceptionally quiet: With a noise level of only 36 dB(A), the actuator is perfectly suited for noise-sensitive environments such as offices, hotel rooms, and healthcare facilities.
Configurable via Belimo Assistant 2: Parameters such as operating range, position feedback, and runtime can easily be adjusted via the Belimo Assistant 2 app on smartphone, tablet, or PC.
Adjustable direction of movement via L/R mounting: The direction of rotation for both the motor and spring return is determined during installation, enabling flexible application across various damper configurations.
Overload protection without limit switches: The actuator automatically stops upon reaching mechanical end stops, preventing wear and simplifying installation.
IP54 protection class: Protected against dust and splashing water from all directions, ensuring durability against daily environmental influences and a long service life.

Installation, Maintenance, and Applications

The actuator mounts directly onto the damper shaft using the supplied universal clamp ring, suitable for shaft diameters from 8 to 16 mm. The shaft must be at least 84 mm long and extend a minimum of 20 mm. An included anti-rotation device prevents the actuator from rotating along with the shaft. The direction of movement for both motor and spring return is set via the mounting orientation (L/R). The rotation angle is mechanically adjustable between 37% and up to a maximum of 95%. The actuator does not include manual override. Electrical connection is via a fixed 1-metre cable with four 0.75 mm² cores. The actuator is configurable via Belimo Assistant 2, maintenance-free, and suitable for modulating and communicative positioning of smaller damper sections in ventilation units, fan coil units, air handling units, and building automation systems in commercial and residential installations.

Brand	Belimo
Category	Belimo damper actuators
GTIN	7630498104916
Manufacturer's item number	LF24-SR
Article number	23010057

Specifications

Category code	101
Width	130 mm
Height	85 mm
Depth	300 mm
Model	Rotating
Housing material	Plastic
Degree of protection (IP)	IP54
Max. electric power input	5 A
Control signal	2 - 10 V
Degree of protection (NEMA)	3
Explosion-proof	No
Ambient temperature (min)	-30 °C
Ambient temperature (max)	50 °C
Supply voltage	24 V AC/DC
Torque	4 Nm
Transmission	With cogwheels
Suitable for air accessory	Yes
Suitable for valve	No
Connection cable length	1 m
Regulation type splitrange	No
Energy consumption in operation	2.5 W
Regulation type on/off	No
Energy consumption at rest	1 W
Regulation type modulating	Yes
Auxiliary contacts optional	Yes
Return at zero supply voltage	Yes
With safety function	Yes
Adjustable operating range	No
Automatic stroke recognition	No
Auxiliary contacts	No
Suitable for manual operation	No
Self-adjusting travel length	No
With direct mount top flange according to ISO 5211	No
End contacts	None
Adjustable position feedback signal	No
Operating time	150 s
With mechanical setting indicator	Yes
Potential free switch contact	No
Deactivated when closed	Yes
Max. angle of rotation	95 °