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7. Laying the air hoses
7.1
Connecting the air hoses
The ventilation device and the air lift pumps must be connected to the valve strip inside the control cabi-
net.
When connecting, make sure that the hoses are attached to the correct connectors. To prevent mistaking
the connections, the air lift pumps and the downpipe of the ventilation into the tank as well as the four
connection points on the control cabinet are colour coded as follows:
Feed lift pump (red)
Ventilation (stainless steel)
Drainage lift pump (black)
Excess sludge lift pump (grey)
The connections must be joined according to their correct colours and then secured with hose clamps.
Hoses are also available in the corresponding colours.
We recommend the GRAF empty conduit cap made of PE foam (Item no. 107887); alternatively PU foam
can be used.
7.2
Assembling the GRAF empty conduit cap made of PE foam
Insert the hoses from the empty conduit into the
corresponding holes in the empty conduit cap.
7. Laying the air hoses
After the hoses have been installed and connected, the empty conduit
ends must be closed off to prevent an exchange of gases between the
wastewater treatment system and the environment of the control cabinet
(dampness, odours).
red hose
blue hose
black hose
white (transparent) hose
Push the hose through the thin top layer. A plug of
material remains stuck to the end of the hose.
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