Description
The Belimo SF24A-S2 rotary actuator is a robust and reliable solution designed for adjusting air dampers in technical building installations. It is ideal for use in HVAC systems, offering fail-safe functionality to ensure continuous operation even in the event of a power failure. This actuator is capable of handling air dampers up to approximately 4 m² in size, making it a versatile choice for various applications.
Electrical Data
- Nominal Voltage: AC/DC 24 V
- Nominal Voltage Frequency: 50/60 Hz
- Nominal Voltage Range: AC 19.2...28.8 V / DC 21.6...28.8 V
- Power Consumption in Operation: 5 W
- Power Consumption in Rest Position: 2.5 W
- Power Consumption for Wire Sizing: 7.5 VA
- Connection Supply / Control: Cable 1 m, 2x 0.75 mm²
- Connection Auxiliary Switch: Cable 1 m, 6x 0.75 mm²
- Parallel Operation: Yes (note the performance data)
Functional Data
- Torque Motor: 20 Nm
- Torque Fail-Safe: 20 Nm
- Direction of Motion Motor: Selectable by mounting L/R
- Direction of Motion Fail-Safe: Selectable by mounting L/R
- Manual Override: By means of hand crank and locking switch
- Angle of Rotation: Max. 95°
- Angle of Rotation Note: Adjustable starting at 33% in 2.5% steps (with mechanical end stop)
- Running Time Motor: 75 s / 90°
- Running Time Fail-Safe: <20 s @ -20...50°C / <60 s @ -30°C
- Sound Power Level: 45 dB(A)
- Mechanical Interface: Universal shaft clamp 10...25.4 mm
- Position Indication: Mechanical
- Service Life: Min. 60,000 fail-safe positions
Safety Data
- Protection Class IEC/EN: III, Safety Extra-Low Voltage (SELV)
- Power Source UL: Class 2 Supply
- Protection Class Auxiliary Switch IEC/EN: II, reinforced insulation
- Degree of Protection IEC/EN: IP54
- Degree of Protection NEMA/UL: NEMA 2
- Enclosure UL: Enclosure Type 2
- EMC: CE according to 2014/30/EU
- Low Voltage Directive: CE according to 2014/35/EU
- Certification IEC/EN: IEC/EN 60730-1 and IEC/EN 60730-2-14
Additional Safety Data
- UL Approval: cULus according to UL60730-1A, UL60730-2-14 and CAN/CSA E60730-1
- Hygiene Test: According to VDI 6022 Part 1 / SWKI VA 104-01, cleanable and disinfectable, low emission
- Type of Action: Type 1.AA.B
- Rated Impulse Voltage Supply / Control: 0.8 kV
- Rated Impulse Voltage Auxiliary Switch: 2.5 kV
- Pollution Degree: 3
- Ambient Humidity Max.: 95% RH, non-condensing
- Ambient Temperature: -30...50°C [-22...122°F]
- Storage Temperature: -40...80°C [-40...176°F]
- Servicing: Maintenance-free
- Weight: 2.3 kg
Operating Mode: The actuator moves the damper to the operating position while tensioning the return spring. The damper returns to the fail-safe position by spring force when the supply voltage is interrupted.
Simple Direct Mounting: Direct mounting on the damper shaft with a universal shaft clamp, including an anti-rotation device.
Manual Override: The damper can be manually actuated and locked in position using the hand crank and locking switch. Unlocking is manual or automatic when operating voltage is applied.
Adjustable Angle of Rotation: Adjustable with mechanical end stops.
High Functional Reliability: The actuator is overload protected and stops automatically when the end stop is reached.
Flexible Signalling: One auxiliary switch with a fixed setting and one adjustable auxiliary switch for signalling 10% or 11...100% angle of rotation.
Electrical Accessories
- Auxiliary Switch: 2x SPDT (Type: S2A-F)
- Feedback Potentiometer: 1 kΩ (Type: P1000A-F)
Mechanical Accessories
- Shaft Extension: 240 mm ø20 mm for damper shaft ø8...22.7 mm (Type: AV8-25)
- End Stop Indicator: (Type: IND-AFB)
- Shaft Clamp: Reversible, for central mounting, for damper shafts ø12.7 / 19.0 / 25.4 mm (Type: K7-2)
- Ball Joint: Suitable for damper crank arm (Type: KH8 / KH10 KG10A)
- Damper Crank Arm: Slot width 8.2 mm, clamping range ø10...18 mm (Type: KH8)
- Actuator Arm: For 3/4" shafts, clamping range ø10...22 mm, Slot width 8.2 mm (Type: KH-AFB)
- Form Fit Insert: 10x10 mm, Multipack 20 pcs. (Type: ZF10-NSA-F), 12x12 mm, Multipack 20 pcs. (Type: ZF12-NSA-F), 15x15 mm, Multipack 20 pcs. (Type: ZF15-NSA-F), 16x16 mm, Multipack 20 pcs. (Type: ZF16-NSA-F)
- Mounting Kit: For linkage operation for flat and side installation (Type: ZG-AFB)
- Baseplate Extension: (Type: Z-SF)
- Anti-Rotation Mechanism: 230 mm, Multipack 20 pcs. (Type: Z-ARS230L)
- Hand Crank: 63 mm (Type: ZKN2-B)
Notes
- The SF24A-S2 actuator is intended for use in stationary heating, ventilation, and air-conditioning systems and should not be used outside these specified applications.
- Ensure that installation is carried out by authorised specialists and that all applicable regulations are followed.
- The device contains electrical and electronic components and must not be disposed of as household waste. Follow local regulations for disposal.
- The combination of power supply voltage and safety extra-low voltage in the auxiliary switches is not permitted.
For more information and to explore our range of Belimo products, visit our website at https://ecospares.co.uk/collections/belimo. If you need any assistance, please contact us.
