Kessel Ecolift XL Instructions De Pose Et D'utilisation page 29

Fix the optical probe on the backwater flap(s)
Depending on the model type, there are either one or two
optical probes for backwater detection included in the scope
of delivery.
These are fitted as follows:
Cable marking
none
yellow
Backwater flap probe
Fix the optical probe (1) on the backwater flap (a) and
optionally (B), to do this:
Remove the sealing cap (2).
Use the screws of the sealing cap to fit the probe (without
yellow adapter).
Redundant valve probe
Fix the optical probe (1) on the backwater flap (a) and
optionally (B), to do this:
Unscrew the screws of the sealing cap (2) and remove
the sealing cap.
Insert the yellow adapter (3).
Use the sealing cap screws to fit the probe.
Compressor set for air bubbling
If special installation conditions prevail, a compressor set for air bubbling should be fitted.
Special installation conditions
Length of pressure hose > 10m
Laying of the pressure hose with continual upward gradient not possible
Condensate formation in the pressure hose
Connect the pressure hose in accordance with the enclosed installation instructions.
010-694
Function
Backwater flap
Redundant valve
Backwater lifting station / Installation and operating instructions 29 / 116