17
If a backflow occurs due to a drain blockage/defect of the lift pumping station, reaching into the process water storage tank of
the
Watermanager GWM
, the water is drained through the side emergency overflow slit of the process water storage tank into
the installation room. This free overflow is required to protect the drinking water line in accordance with DIN EN 1717.
Figure 13: Type AB emergency overflow
5.9.
Emergency overflow due to Type AB drinking water feed
The installation room must have a suitable floor drain/sump to securely drain away the overflowing water in case
of back-flooding via the emergency overflow slit.