FSNF120-S ACTUATOR SR 120V 70in-lb
Buy Belimo's FSNF120-S at NECC
Application:
The type FSNF spring-return actuator is intended for the
operation of smoke and combination fire and smoke dampers
in ventilation and air-conditioning systems. The actuator will
meet requirements of UL555 and UL555S when tested as an
assembly with the damper and will meet requirements of UBC
for 15 second opening and closing at 350°F. Square footage
of damper operated will depend on make and model and the
temperature required.
Operation:
Mounting of the actuator to the damper axle shaft or jackshaft
(3/8” to 1.05”) is via a cold-weld clamp. Teeth in the clamp
and V-bolt dig into the metal of both solid and hollow shafts
maintaining a perfect connection. The specially designed
clamp will not crush hollow shafts. The bottom end of the
actuator is held by an anti-rotation strap or by a stud provided
by the damper manufacturer.
The actuator is mounted in its fail safe position with the
damper blade(s) closed. Upon applying power, the actuator
drives the damper to the open position. The internal spring is
tensioned at the same time. If the power supply is interrupted,
the spring moves the damper back to its fail-safe position.
