Belimo SM24A-SR Modulating Damper Actuator (20Nm, 24VAC/DC)

Manufaturer:	Belimo
Model:	SM24A-SR

Product code

111-63451

Price 819.97 USD

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Description

air conditioning
Maintenance free, low power consumption, rotary damper/louver actuator, compatible with all major HVAC controls.
Lifespan: 60,000 cycles minimum Stall torque technology requires no end switch Adjustable U-clamp can be used on round or square shafts Visual position indication Push button, manual override Direction switch IP54 rating Motor runtime 150 seconds 1 m pre-wired cable Part number < 504-1236') 504-1236/ and < 504-1242') 504-1242/ includes built-in 1xSPDT 3 (0.5)A 250 V ac auxiliary switch Optional auxiliary switch (Part number < 504-1545') The 504-1545 is suitable for use with LM, NM, SM and GM damper actuators and has two SPDT switches rated at 3 (0.5) A 250 V ac with a 1 m Cable included
Quantity: 1 piece
Maximum damper area: 4m2
Damper spindle compatibility: 10 → 20mm
Power consumption: 2W
Control type: modulation
Power supply voltage: 24V ac/dc
Motor torque: 20Nm
Noise level: 45dB(A)
Maximum damper spindle size: 20mm
Minimum damper spindle size: 10mm
RoHS compliance status: Compliant
Code number: 504-1309
Frequently Asked Questions – Belimo SM24A-SR Modulating Damper Actuator:

1. What type of actuator is the SM24A-SR?

The SM24A-SR is an electronic, spring-return modulating damper actuator designed for HVAC dampers in building automation systems.

2. What torque rating does it deliver?

It provides a continuous torque of 20 Nm, suitable for dampers up to approximately 4 m² in area.

3. Which supply voltages are supported?

The actuator operates on 24 V AC/DC (19.2 … 28.8 V) at 50–60 Hz, making it compatible with standard control panels.

4. What control and feedback signals does it use?
Control: 2 … 10 V DC (input impedance 100 kΩ)
Position feedback: 2 … 10 V DC (max. 1 mA)
5. What is the maximum rotation angle and running time?

It can rotate up to 95° in approximately 150 s (for 90°), allowing fine adjustment of damper position.

6. How do I reverse or manually override the actuator?
Direction: A built-in switch selects clockwise or counter-clockwise drive
Manual override: Push-button allows temporary hand operation; it can be locked to fix position.
7. What power consumption and noise levels can I expect?
Power consumption: 2 W during operation; 0.4 W at rest; 4 VA for wiring sizing
Noise: 45 dB(A) during motor run.
8. What environmental conditions and protection ratings apply?
Ambient temperature: –30 °C to +50 °C (storage –40 °C to +80 °C)
Humidity: up to 95 % RH, non-condensing
Protection: IP54 / NEMA 2; SELV (Safety Extra-Low Voltage).
9. Which mechanical interface does the SM24A-SR use?

It features a universal, reversible shaft clamp for 10–20 mm damper shafts, simplifying installation on round or square shafts.

10. Can I operate multiple SM24A-SR units in parallel?

Yes. Parallel operation is supported for synchronous damper control—ensure total load remains within the actuator’s performance data.

11. What safety and certification standards does it meet?
CE compliant (EMC 2014/30/EU, LVD 2006/95/EC)
UL/cULus to UL 60730-1/-2-14 and CSA E60730-1
VDI 6022 hygienic design for cleanability and low emissions.
12. Where can I find detailed technical documentation?

The complete datasheet, wiring diagrams, and installation instructions are available from Belimo or contact qtetech.com/en. Request document code SM24A-SR for exact specifications.