NF24A
Belimo NF24A, SF24A, NF24A-S2, SF24A-S2, NF230A Quick Start Manual
...
Spring return actuator with emergency
function for adjusting air dampers in
ventilation and air conditioning systems
in buildings
• For air dampers up to approx. 2 m
2
• Torque 10 Nm
• Nominal voltage AC/DC 24 V
• Control: Open-close
Technical data
Electrical data
Functional data
Safety
Dimensions / Weight
Technical data sheet NF24A
Nominal voltage AC 24 V, 50/60 Hz / DC 24 V
Nominal voltage range AC 19.2 ... 28.8 V / DC 21.6 ... 28.8 V
Power consumption In operation
At rest
For wire sizing
Connection Cable 1 m, 2 x 0.75 mm
Torque Motor
Spring return
Direction of rotation Can be selected by mounting L / R
Manual override With hand crank and interlocking switch
Angle of rotation Max. 95° , can be limited with adjustable
Running time Motor
Spring return
Sound power level Motor
Spring return
Service life Min. 60,000 emergency positions
Position indication Mechanical
Protection class III Extra low voltage
Degree of protection IP54
EMC CE according to 2004/108/EC
Certication Certied to IEC/EN 60730-1 and IEC/EN 60730-2-14
Mode of operation Type 1.AA
Rated impulse voltage 0.8 kV
Control pollution degree 3
Ambient temperature –30 ... +50°C
Non-operating temperature –40 ... +80°C
Ambient humidity 95% r.h., non-condensating
Maintenance Maintenance-free
Dimensions See «Dimensions» on page 3
Weight Approx. 1.8 kg
6 W @ nominal torque
2.5 W
8.5 VA
2
Min. 10 Nm @ nominal voltage
Min. 10 Nm
mechanical end stop
≤75 s (0 ... 10 Nm)
≤20 s @ –20 ... 50°C / max. 60 s @ –30°C
≤45 dB (A)
≤62 dB (A)
UL Class 2 Supply
NEMA2, UL Enclosure Type 2
cULus according to UL 60730-1A and UL 60730-2-14
and CAN/CSA E60730-1:02
www.belimo.com T2-NF24A • en • v1.1 • 06.2011 • Subject to changes 1 / 3
Safety notes
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Product features
Mode of operation
Technical data sheet NF24A
• The actuator is not allowed to be used outside the specified field of application, especially in
aircraft or in any other airborne means of transport.
• It may only be installed by suitably trained personnel. Any legal regulations or regulations
issued by authorities must be observed during assembly.
• The device may only be opened at the manufacturer's site. It does not contain any parts that
can be replaced or repaired by the user.
• The cable must not be removed from the device.
• When calculating the required torque, the specifications supplied by the damper manufacturers
(cross-section, design, installation site), and the air flow conditions must be observed.
• The device contains electrical and electronic components and is not allowed to be disposed
of as household refuse. All locally valid regulations and requirements must be observed.
The actuator moves the damper to the operating position at the same time as tensioning the
return spring. The damper is turned back to the safety position by spring force if the supply
voltage is interrupted.
Simple direct mounting
Manual override
Adjustable angle of rotation
High operational reliability
Electrical installation
Wiring diagram
Notes
• Connect via safety isolation transformer.
• Parallel connection of other actuators possible.
Note the performance data.
Accessories
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Electrical accessories Auxiliary switch unit S2A-F � � T2 - S2A-F
Mechanical accessories Various accessories
Simple direct mounting on the damper spindle with a universal spindle clamp, supplied with an
anti-rotation strap to prevent the actuator from rotating.
Manual operation of the damper with the hand crank, locking in any position with the interlocking
switch. Unlocking is manual or automatic by applying the operating voltage.
Adjustable angle of rotation with mechanical end stop.
The actuator is overload-proof, requires no limit switches and automatically stops when the end
stop is reached.
Cable colours:
1 = black
2 = red
Description Data sheet
Feedback potentiometer unit P200A-F � � T2 - P200A-F
* further versions on request
www.belimo.com T2-NF24A • en • v1.1 • 06.2011 • Subject to changes 2 / 3
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