Minimax ® -Filter External; Laying Connections; Placing And Filling - Graf MINIMAX Notice D'installation Et D'entretien

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5. Installation and assembly
®
5.2 MINIMAX -Filter external
5.2.1 Excavation
So that sufficient working room is available and the filter can be evenly embedded, the surface area of the
excavation should exceed the filter dimensions on all sides by approximately 300 mm.
The excavation slope is according to DIN 4124. The installations excavation must be level and smooth.
The depth of the excavation must be measured so that the maximum installation depth (970 mm from the
top surface of the filter) is not exceeded. For an all year round utilisation of the system it is necessary that
the water transporting parts of the installation and equipment are installed in a frost free environment,
precise data regarding this should be requested from the appropriate administrative authority.

5.2.2 Laying connections

All supply and run off pipes must have a gradient of at
least 1% (subsequent settling of the fill materials should
be taken into account). The connection is made to the
moulded pipe connections on the filter housing. To
reduce the flow rate of the water the inlet pipe should be
laid level for approximately the last 2 m before joining
the filter.
The German DIN 1986 must be complied with, this
means Ø inlet and < Ø outlet.
If only one of the two tank supply pipe connections be
connected then the filter should be inclined
approximately 1% towards the pipe so that no water may
remain standing at the opposite connection.

5.2.3 Placing and filling

The filter is to be installed without damage in the
prepared excavation. Before back-filling with smooth sand the position of the filter should be checked and
then embedded in layers of not more than 30 cm.
Each layer must be well compacted with a hand held tamper. Care must be taken during the embedding
to ensure the filter is not damaged. Under no circumstances should powered compacting machines be
used. The surrounding back fill must be at least 30 cm wide.
5.2.4 Telescope installation
The telescope is pressed into the filter housing
from above. It is important to pay attention that the
inlet pipe is not obstructed in any way by the
telescope when installed. Before pushing in the
telescope the profiled sealing ring is placed in the
housings recess. The telescope and the sealing
ring must be thoroughly coated with the lubricating
soap included in the delivery (use no lubrication
that is mineral oil based). Attention: If the
lubricating soap
becomes dry and the telescope becomes difficult
to move then there is the danger that the sealing ring will be forced out of its recess. Before filling the
sealing ring must be checked once again that it is seated correctly in position. The telescope must be
sufficiently embedded and supported that no forces are transferred to the housing.
The filter may under no circumstances be traversed by traffic and is only to be installed in green areas.
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