Kessel Aqualift S XL Instructions De Pose Et D'utilisation page 42

7.4 Level sensor
Cleaning the level sensor
Pull the level sensor out of the protective tube (1).
Clean the level sensor and make sure that the inside of
the protective tube (1) is free of soiling.
Insert the level sensor back into the protective tube (1)
and make sure that the dimension (L) (see "Level sen-
sor", page 36) is set up.
7.5 Backflow preventer
Polymer fitting
Move the ventilation device (5) on the backflow preventer (2) to a horizontal position.
The accumulated wastewater can flow back from the pressure pipe into the system tank.
Remove and clean the backflow preventer (2)
Undo screws (1) and (3), push out the backflow preventer(2) from the side and clean it.
Remove the flap catch (4).
Pull the non-return flap off, check for wear, remove any blocking parts if necessary and flush through.
Fit the parts again in reverse order.
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