The Belimo NF120 US direct mount damper actuator is designed for the On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. The NF120 US is On/Off from an auxiliary contact, or a manual switch, and the actuator may be 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 other applications.
The NF120 US provides true spring-return operation for reliable fail-safe 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. Provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°. May be stalled anywhere in its normal rotation without the need of mechanical end switches.
Product Specifications
| Power supply |
120 VAC ± 10% 50/60 Hz |
| Power consumption |
running 7 W, holding 4 W |
| Transformer sizing |
9.5 VA |
| Electrical connection |
3 ft, 18 GA appliance cable, 1/2”
conduit connector |
| Overload protection |
Electronic throughout 0 to 95°
rotation |
| Electrical protection |
Auxiliary switches are double
insulated |
| Angle of rotation |
95°, adjustable 30 to 95° w/
accessories |
| Torque |
60 in-lb [7 Nm] constant torque |
| Direction of rotation |
reversible with CW/CCW mounting |
| Position indication |
visual indicator, 0° to 95°, (0° is
spring return position) |
| Running time motor |
< 75 sec |
| Running time (nominal) spring |
< 60 sec |
| Humidity |
5 to 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 type 2 / IP54 |
| Housing material |
zinc coated steel |
| Agency listings |
cULus acc. to UL 873 and CAN/CSA C22.2
No. 24-93 |
| Noise level |
max. 45 dB (A) |
| Servicing |
maintenance free |
| Quality standard |
ISO 9001 |
| Weight |
7.3 lbs (3.3 kg) |