Fire & Smoke Actuator
133 in-lb Torque
For two position control of UL555S rated dampers in HVAC. Actuator sizing should be done in accordance with the damper manufacturerÛªs specifications.
The actuator is mounted directly to a damper shaft or jackshaft 3/8Û to 1.05Û in diameter by means of its universal clamp. A crank arm and mounting brackets are available if the actuator cannot be direct coupled to the jackshaft or damper shaft.
Square footage of damper operated will depend on make and model of damper. Typically 12 sq.ft. minimum up to 24 sq.ft maximum will be operated for UL555S applications.
The FSAF series actuators provide true spring return operation for reliable fail-safe application and positive close-off on UL555S dampers. The spring return system provides constant torque to the damper with, and without, power applied to the actuator.
The FSAF series provides 95å¡ of rotation and is provided with a graduated position indicator showing 0 to 95å¡. The FSAF has a manual positioning mechanism which allows the setting of any damper position within its 95å¡ of rotation.
The actuator is shipped in the zero fail-safe position to provide automatic compression against damper gaskets for tight shut-off. When power is applied, the manual mechanism is released and the actuator drives toward the open position where it stops rotating.
The manual override can also be released physically by the use of a crank supplied with the actuator.