Graf VS-Control flex M Wartungsanleitung Seite 9

③
Note:
In order to ensure proper operation of retention systems, sufficiently dimensioned filters
should generally be provided. These filters are located in front of the retention system in
the direction of the rainwater flow.
In special cases, multi-stage filter systems with coarse and fine filters are used to clean the
precipitation water.
The positioning of fittings or other devices which hydraulically influence the free water dis-
charge behind the vortex flow control shaft is not permitted. A backlog must always be
ruled out.
In the case of an unforeseen backlog, the orifice has to be placed again level and horizon-
tally in the vortex flow control shaft body.
3. Maintenance and care
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A correct positioning of the orifice is
possible by using a roof batten with an
integrated hook.
The orifice has no upper or under side.
2021-04