Grundfos DUOLIFT Series, Installation And Operating Instructions Manual

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8
Accessories
We recommend the following accessories.
* The Unilift CC pump is supplied with a non-return
valve.
3. Installing the product
3.1 General guidelines
The guidelines for correct mechanical installation of
lifting station are according to EN 12056-4.
•
If the lifting station is installed in a basement with
recurrent penetration of groundwater, we
recommend that you install a drainage pump in a
separate pump sump below floor level. In some
countries the drainage pump is mandatory. If
there is only a risk of penetrating groundwater,
we recommend that you install a float switch
outside the lifting station and connect it to a
controller which indicates high-level alarm in
case of flooding.
• Fix the tank to the floor.
• We recommend that you connect a diaphragm
pump to the tank to be able to empty the tank
manually.
• All outlet pipes from the lifting station, diaphragm
pump and drainage pump must have a backflow
loop, i.e. a bend above the local backflow level.
Commonly, the highest point of the bend must be
above street level. See fig.
2 .
• Surface water must not be discharged into the
lifting station inside the building. Collect and
discharge surface water outside the building.
• Install a non-return valve at the outlet of the lifting
station to prevent backflow.
• Fit isolating valves at the inlet and outlet of the
lifting station.
• The volume of the outlet pipe above the non-
return valve up to the backflow loop must be
smaller than the effective tank volume. See pos.
7 in figures
1 and 2 .
• In general, a lifting station for black wastewater
must be vented above roof level. However, it is
permitted to lead the vent pipe into the main
building ventilation system. Place special two-
way venting valves outside the building.
• If the wastewater is discharged into a collecting
line, the collecting line must have a filling ratio of
at least h/d = 0.7. The collecting line must be at
least one nominal diameter bigger after the outlet
pipe connection.
• Use 45 ° bends to avoid deposits in the pipes.
Outlet pipe
Designation
Quantity
Unolift Duolift
CC/
KP
APB/
SEG
CC/
KP
APB/
SEG
Non-
return
valve
-* 1 -* 2
Double
nipple
- 1 3 5
Isolating
valve
1 1 1 1
Union nut - - 2 2
T-piece,
PVC, 90 °
- - 1 1
Elbow,
PVC, 90 °
- - 2 2
Pipe,
∅
50, 2 m
- - 1 1
Thread
tape
1 1 1 1