In order to avoid sticking valves, the Gira KNX servo 3 has a valve flushing function which is carried out regularly and as required and prevents calcification or sticking. The KNX servo 3 comes up with two different concepts for this purpose:
1. Cyclical valve flushing is launched automatically. A cycle time between 1 and 26 weeks can be specified via the ETS. If a time signal is available in the KNX system, valve flushing at night can also be suppressed in order to avoid possible nuisance, in which case the valve flushing will be postponed until the next morning. Unnecessary cyclical valve flushing, e.g. in winter, is avoided by monitoring the minimum valve strokes.
2. With the aid of smart cyclic valve flushing, a flushing process is only started automatically if a defined valve stroke has additionally not been completed for a certain period of time. Flushing processes across an entire valve stroke are therefore only started if they are really necessary. Unnecessary cyclical valve flushing, e.g. in winter, is therefore avoided.