Damper Actuator, 90 in-lb [10 Nm], Spring return, AC 24...240 V / DC 24...125 V, On/Off, 2 x SPDT

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Application:

For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. Control is On/Off from an auxiliary contact, or a manual switch. The actuator is mounted directly to a damper shaft up to 1.05” in diameter by means of its universal clamp. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft.

Operation

The NFB and NFX series actuators provide true spring return operation for reliable failsafe application and positive close off on air tight dampers. The spring return system provides constant torque to the damper with, and without, power applied to the actuator. The NFB and NFX series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. The NFBUP-S and NFXUP-S versions are provided with two built-in auxiliary switches. These SPDT switches provide safety interfacing or signaling, for example, for fan startup. The switching function at the fail-safe position is fixed at +10°, the other switch function is adjustable between +10° to +90°. The NFBUP, NFBUP-S, NFXUP and NFXUP-S actuator is shipped at +5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.

Technical Data and Specifications

Power supply: 24...240 VAC -20% / +10%, 50/60 Hz 24...125 VDC ±10%
Power consumption: running 6 W holding 2.5 W
Transformer sizing:
- 6 VA @ 24 VAC (class 2 power source)
- 6.5 VA @ 120 VAC
- 9.5 VA @ 240 VAC
Electrical connection: Two 3 ft, 18 gauge appliance cables with 1/2” conduit connectors
Overload protection: electronic throughout 0 to 95° rotation
Control: on/off
Torque: 90 in-lb [10 Nm] minimum
Direction of rotation: spring reversible with CW/CCW mounting
Mechanical angle of rotation: 95° (adjustable with mechanical end stop, 35° to 95°)
Running time:
- Motor: < 75 seconds
- Spring: 20 seconds @ -4°F to 122°F [-20°C to 50°C]; < 60 seconds @ -22°F [-30°C]
Position indication: visual indicator, 0° to 95° (0° is full spring return position)
Manual override: 5 mm hex crank (³⁄₁₆" Allen), supplied
Humidity: max. 95% RH non-condensing
Ambient temperature: -22°F to 122°F [-30°C to 50°C]
Storage temperature: -40°F to 176°F [-40°C to 80°C]
Housing: Nema 2, IP54, Enclosure Type2
Housing material: zinc coated metal and plastic casing
Agency listings: † cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EC & 2006/95/EC
Noise level: <50dB(A) motor @ 75 seconds ≤62dB(A) spring return
Auxiliary switches: 2 x SPDT 3A (0.5A) @ 250 VAC, UL approved one set at +10°, one adjustable 10° to 90°

Resources:

BELIMO NFBUP-S Spring Return Actuator Technical Literature