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Operation and mechanisms
Operation and mechanisms
ONE Spring return actuator for remote control
The spring-return actuator ONE is designed to easily operate Rf-t fire dampers of all sizes, automatically or remotely. Five models are
available, 24 or 230 volt, with FDCU or FDCB position switches; and 24 volt with plug (ST).
1. unlocking button
2. blade position indicator
3. LED
4. battery compartment to reset motor
5. plug (ST)
2
1
3
4
Unlocking
∎
manual unlocking
: shortly press the unlocking button (1) once.
∎
automatic unlocking
: the fusible link reacts as soon as the temperature in the duct reaches 72°C.
∎
remote unlocking
: by interrupting the power supply.
Resetting
∎
manual resetting
: open the battery compartment (4) and press a 9V battery against the contact springs. Hold this position until
the LED (3) emits a continuous light. Check whether the indicator (2) shows that the damper blade is in the open position. Remove
the battery, the LED fades away. Close the battery compartment.
∎
motorised resetting
: switch off the power supply for at least 5 sec. Power the actuator (respect the prescribed voltage) for at least
75 sec. The resetting stops automatically when the end of range is reached (damper open).
Caution:
If the LED (3) flickers fast (3x/sec.), the battery is discharged: use a new battery.
If the LED (3) flickers slowly (1x/sec), the resetting is in progress.
If the LED (3) is continuously on, the resetting is complete and the motor is powered.
If the actuator detects voltage on the power cable, a brief contact of the battery is enough to start the resetting process.
The power supply of this actuator cannot be individually replaced. If the cable is damaged, the whole unit must be discarded
and replaced.
The housing of the mechanism contains a temperature sensor. When the temperature in the housing exceeds 72°C, the
mechanism unlocks. The LED flashes twice per second. When the temperature drops below 72°C, the mechanism can only be
reset in a motorised manner after a manual reset (with a battery).
The end of range switches need 1 second after operation to adopt a stable position.
Make sure the thermal trigger device is present in the actuator. The actuator might not function properly if this is not the case.
