Backfilling; Commissioning And Maintenance - Graf 340143 Notice D'installation Et D'entretien

5. Installation and assembly Drainstar Filter External
5.4.2 Telescope suitable for light traffic
Assemble the telescope as in point 5.4.1. To ensure suitability for traversing by car, the telescope collar
must be lined with lean concrete. The concrete layer for the lining must be at least 20 cm wide and about
30 cm thick.
Caution: Be sure to use the cast steel cover. Loads imposed by heavy goods vehicles are not allowed.
The telescope must be sufficiently lined so that no forces are transferred to the housing under any
circumstances.
5.5

Backfilling

The horizontal position of the filter must always be checked before and during backfilling. The filter casing
is created with layers of round gravel (grain size 8/16 in accordance with DIN 4226-1) to a height of about
300 mm. The individual layers are then compacted with a light compaction device (hand stamper or
similar). Avoid damaging the filter housing when compacting. To ensure that no forces are transmitted to
the filter housing, the telescope must be well lined and compacted. The cover is then placed on top and
closed in a child-resistant manner (Section 1.1 must be observed). The screw on the lid should be
securely tightened so that it cannot be opened by a child!
The entire system is to be checked at least every three months for water tightness, cleanliness and
stability.
The removal device must be oriented at a 90° angle to the inlet before commissioning and after each
maintenance, so that coarse dirt particles do not get caught on the strainer basket handle. The strainer
insert is removed for cleaning, when the basket is thoroughly cleaned with water until all pores are
opened. It is recommended that a visual inspection is carried out every 4 - 5 weeks (in the autumn more
frequently due to falling leaves) and cleaning undertaken if necessary. The cleaning intervals may change
depending on the dirt or connection area.
The strainer basket must be pressed slightly downwards when inserting after each cleaning, so that the
surrounding seal fits snugly.
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6.

Commissioning and maintenance

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