The cables are connected to control housings mounted on the thermal actuators.
Operation:
The damper is fully opened by applying electrical power to actuator V1 for one minute (diagram 1), after which the power is released (diagram 2).
The damper is fully closed by applying electrical power to actuator V2 for one minute (diagram 3), after which the power is released (diagram 4).
Power must remain off for at least five 5 minutes between opening and closing of the flap.
The only time there is electrical power to the damper, therefore, is during opening or closing. |
For safety protection, provide a 1A phase+neutral circuit breaker.
Before undertaking any work on the dampers, isolate them electrically at the main switchboard.

The flap position is shown by an indicator on the spindle:
closed position ( ) or open position ( ).
|