FSTF24.1 US Belimo Actuator

Specifications

• Actuator Type
  • Spring return
• Angle of Rotation
  • 95
• Control Type
  • On/Off
• Degree of Protection
  • IP42, NEMA 2, UL Enclosure Type 2
• Direction of Rotation (Fail-Safe)
  • Reversible with cw/ccw mounting
• Electrical Connection
  • cable
• Power Consumption (Running)
  • 2 W
• Running Time (Fail-safe)
  • <25 s
• Running Time (Motor)
  • 75 s @ 250°F [121°C]
• Safety Function
  • YES
• Shaft Diameter
  • 1/4…1/2″ round, centers on 1/2″
• Torque
  • 18 in-lb [2 Nm]
• Voltage AC/DC
  • AC/DC 24 V

Application

The type FSTF 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. Square footage of operating damper will depend on make and model per damper manufacturer UL testing.

Operation

Mounting of the actuator to the damper axle shaft or jackshaft is via a coldweld 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 antirotation strap or by a stud provided by the damper manufacturer. The actuator is mounted in its fail safe position with the damper blade(s) typically 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.

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