Belimo Damper Actuator, Fail-Safe Spring Return, 240V, On/Off

Belimo Damper Actuator Fail-Safe On/Off 240V Spring, 90in-lb, On/Off, UP

Torque min. 90 in-lb, for control of air dampers
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