Belimo's NF damper actuators are a series of 10 Nm torque actuators with safety function for operating dampers and valves in building installations. NF rotary actuators are suitable for air dampers up to approx. 2 m2. The series includes: NFA, NFA-S2, NF24A, NF24A-S2, NF24A-SR, NF24A-SR-S2.
The NF damper actuator moves the damper into the operating position while charging the return spring. When the power is interrupted, the return spring returns the damper to the safe position. The NF series is easy to mount directly on the damper shaft using a universal mounting clamp, supplied with a tape to prevent the actuator from turning.
The NF actuator can be manually operated with a crank and locked in any position using a lock switch. Unlocking from the position set in this way is done manually or by connecting the supply voltage.
The angle of rotation is adjusted using mechanical stops.
The NF damper actuator is overload protected, requires no limit switches and stops automatically when it reaches the limit stop.
• With a spring,
• Rated torque 10Nm,
• For air dampers with an area of up to approx. 2 m2,
• Mechanical connection, universal mounting clamp: 10...25.4 mm,
• Movement time - 90° motor: from 75 to 150 seconds,
• Working time in the 90° safe position: less than 20 seconds,
• Direction of movement - motor: selectable by mounting L/R,
• IP 54.
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