Installation And Assembly Drainstar Filter External; Preparation Of The Excavation Pit; Insertion And Making Connections; Insertion Of The Filter Basket - Graf Drainstar Instrucciones De Instalación Y Mantenimiento

5.
5.1

Preparation of the excavation pit

To ensure that sufficient workspace is available and the filter can be evenly compacted, the base area of
the excavation must overtop the filter dimensions on each side by 500 mm. The bank shall be laid in
accordance with DIN 4124. The foundation soil must be horizontal and level. The depth of the pit shall be
such that the installation depth to the filter bottom is a maximum of 1050 mm. A layer of compacted
rounded gravel (grain size 8/16 in accordance with DIN 4226-1, thickness about 100 mm) shall be spread
out as a base.
Important: The footprint for the shaft must be absolutely horizontal in order to ensure optimum
performance.
5.2

Insertion and making connections

The filter is inserted into the prepared pit and connected to the corresponding pipes. It is important to
ensure that all pipes are installed with a fall in the flow direction of minimum 1 % with no deflection. The
emergency overflow should be connected in order to prevent a backflow into the supply line.
Important: DIN 1986 must be observed, i. e. ∅ Inflow = ∅ Outflow.
5.3

Insertion of the filter basket

The strainer basket must be pressed slightly downwards when inserting, so that the surrounding seal fits
snugly. In addition, care must be taken to ensure that the removal device is oriented at a 90 ° angle to the
inlet before commissioning and after each maintenance, so that coarse dirt particles do not get caught by
the strainer basket handle.
5.4

Assembly of telescope

5.4.1 Telescope pedestrian resistant
The telescope is inserted into the filter housing from above.
For pit depths < 930 mm the telescope and possibly the
shaft housing must be shortened. It is essential to ensure
that the incoming pipe cannot be blocked fully or partially by
the telescope in its final installed state. Before pushing in,
the profile seal is inserted into the seal groove of the
housing. The telescope and the seal must be generously
lubricated with the soft soap supplied (do not use mineral oil-
based lubricants)
Caution: If the soft soap dries, the telescope becomes difficult to move and there is a risk that the seal
may slip out of the seal groove. Before backfilling, the seal must be checked for a correct fit. The
telescope must be sufficiently lined so that forces can under no circumstances be transferred to the
housing.

Installation and assembly Drainstar Filter External

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Concrete
(for vehicle loading)
Gravel
Filter housing
9 / 20
Telescope
Profile seal