Graf 107437, Installation And Assembly Instructions, Page: 23 / 48

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4. Assembly of the switch cabinet
4.6 Connecting the air hoses
The aeration system and the three air lift pumps must be connected to the valve strip in the switch
cabinet.
For the lifters, hoses with 13 mm inner diameter are required, while a hose with 19 mm inner diameter is
needed for the aeration hose. When connecting, make sure that the hoses are attached to the correct
connectors.
In order to avoid confusion, the lifters, the ventilation downpipe and the four connectors on the switch
cabinet have all been colour coded:
Red feed lifter Red hose , 13mm
Stainless steel aeration Blue hose
, 19mm
Black discharge lifter Black hose , 13mm
Grey excess sludge lifter Clear hose
, 13mm
As a general rule, the connections with the same colours must be attached to one another and fixed with
hose clamps. Hoses can be supplied in the relevant colours.
Once the hoses have been laid and attached, the empty pipe must be
sealed in order to avoid gas exchange between the wastewater
treatment system and the surroundings of the cabinet (moisture,
odours).
Recommended here is the GRAF empty pipe seal made from PE foam (art. no. 107887). Alternatively,
PU foam can be used.
4.7 Mounting the GRAF empty pipe seal made from PE foam
.
Insert the hoses from the empty pipe into the holes
in the empty pipe seal. Push the hose through the thin top layer. A plug of
material remains stuck in the end of the hose.