FSNF24 DAMPER ACTUATOR SPR 24V ON/OFF
Buy Belimo's FSNF24 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 open and close in 15 seconds at 350°F. Square footage of
damper operated will depend on make and model of damper and the temperature
250°F or 350°F.
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.
-FC Models have the same electrical and mechanical characteristics except instead of
a 1/2" conduit connector a 3/8" screw flex connector is supplied.
