Viega 4987.2, Инструкция по эксплуатации, Страница: 11 / 14

Install the base unit horizontally into the base pipeline.
Observe flow direction!
At maximum, line up to the middle of the drainpipe.
Close emergency shut-off (position
"
OFF
‟
).
In this way, damage from flooding can be avoided before commis-
sioning.
3.3 Care and maintenance
3.3.1 Maintenance
DIN 1986-3 requires
"
Maintenance
"
of the system twice a year to ensure
safe operation.
Requirements:
n
Maintenance must be carried out by a professional.
n
Only use original parts for repairs, maintenance and extensions.
n
Replace defective components, do not repair.
n
When using cameras and cleaning devices (cleaning spiral, high-
pressure cleaner), protect the backflow trap against mechanical
damage.
n
Only begin maintenance work when is certain that there is no back
flow situation and the drainage fittings upstream from the Backflow
trap are not being used.
Clean
Handling
Grundfix backflow trap type 1 11 from 14