3 Connection upper floor
4 Area at risk of backflow
5 Protection against backflow through backflow trap
The connection of the upper floor (3) onto the underground pipe must
be made between the backflow trap and sewer within the building (5) –
only then is it possible to ensure that the wastewater system can func‐
tion faultlessly. To ensure that drainage is permanently guaranteed,
backflow traps may not be employed as the central safeguard for a
building with drainage equipment installed above the backflow level (1) –
in the event of backflow, it would lead to flooding in the building due to
wastewater being unable to drain away (4).
See
‘Regulations from section: Place of installation and installation
Backflow protections and their control units should be installed in such
a way that they are always accessible.
The backflow sensor reacts at accumulation heights of
100 mm, measured from the upper edge of the base pipe‐
line.
Therefore, when planning, the installation heights of the
existing floor drains, out of which water could flow in the
case of backflow, must be taken into account.
If a backflow trap is retro-fitted in a base pipeline, the
height difference of 30 mm between connection pipe and
sleeve must be taken into account.
2.3.3
Maintenance
A monthly inspection must be carried out to ensure safe operation. See
Chapter 3.6.1 ‘Inspection’ on page 33
Maintenance must be carried out twice a year to ensure safe operation.
See
Chapter 3.6.2 ‘Maintenance’ on page 34
Product information
Grundfix Plus Control backflow trap type 3
10