Do Airbus aircraft fitted with ACT have additional fuel system controls? Do Airbus aircraft fitted with ACT (Additional Center Tank) have a push button that controls the fuel transfer to the main center tank? If yes, where is it located?
(Source: Airbus)

Yes they do on the same overhead fuel panel. The additional pb is shown above. If it is not pushed and no fault is shown, then it is in automatic operation, and pushing it allows manual fuel transfer.