The Belimo NF24 US spring return actuator is designed for 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 NF24 US 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 additional applications.
Features
The NF24 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.
The NF24 US provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95° and the actuator may be stalled anywhere in its normal rotation without the need of
mechanical end switches.
Product Specifications
| Control Input Values |
On/Off |
| Weight |
6.6 lbs (3.0 kg) |
| Ambient Temperature |
-22°F to +122°F [-30°C to +50°C] |
| Auxiliary Switch |
No Switch |
| Electrical Connection |
3 ft, 18 GA appliance cable, 1/2" conduit connector
|
| Power Consumption |
running: 5 W, holding: 2.6 W |
| Power Supply |
24 VAC/DC |
| Va Rating |
8 VA |
| Noise Level |
less than 45 dB (A) |
| Servicing |
Maintenance free |
| Shaft Diameter |
1/2" to 1.05" |
| Housing |
NEMA 2 / IP54 |
| Housing Material |
zinc coated steel |
| Angle of Rotation |
95°, adjustable 30 to 95° w/accessories |
| Direction of Rotation |
spring return can be selected by CW/CCW mounting |
| Manual Override |
None |
| Minimum Torque (in-lb) |
60 |
| Running Time (motor) |
< 75 sec. |
| Overload Protection |
electronic throughout 0 to 95° rotation |
| Spring Return Fail Safe |
yes |
| Quality Standards |
ISO 9001 |
| Humidity Rating |
5 to 95% RH noncondensing |
| Storage Temperature |
-40°F to +176°F [-40°C to +80°C] |
| Running Time (Spring) |
< 60 sec. |
| Cable Option |
3 feet |
| Agency Listing |
cULus, CE |
