Grundfos Unilift CC 5 Installation And Operating Instructions Manual page 5

2.2.5 Connecting the non-return valve
To prevent backflow through the pump when it stops,
fit the non-return valve supplied in the adapter. The
non-return valve is fixed when the adapter is fitted to
the pump top outlet port.
Fig. 8 Adapter position and non-return valve
function
2.2.6 Using the side outlet port
If you want to use the side outlet port, proceed as
follows:
1. Remove the non-return valve and adapter from
the top outlet port.
2. Remove the side plug and screw it on the top
outlet port.
3. Fit the 90 ° bend adapter in the side outlet port.
Use thread sealing tape or similar material.
4. Fit the non-return valve in the vertical part of the
90 ° bend.
5. Connect the outlet line directly to the outlet port.
Position the non-return valve in the vertical
part of the 90 ° bend. If positioned in the
horizontal part of the 90 ° bend, the non-
return valve may not function correctly.
Fig. 9 Correct position of non-return valve
2.2.7 Adjusting the float switch cable length
To make sure that the float switch can start and stop
the pump, the free cable length must be min. 100
mm and max. 200 mm. Adjust the start and stop level
by changing the free cable length between the float
switch and the lifting handle.
• An increased free cable length results in fewer
starts and stops and a large difference in level.
• A reduced free cable length results in more starts
and stops and a small difference in level.
Start
Stop
Fig. 10 Start and stop levels with float switch at
minimum and maximum cable lengths
Cable length (L)
min. 100 mm
Pump type
Start
[mm]
Unilift CC 5 350
Unilift CC 7 350
Unilift CC 9 385
L
Cable length (L)
max. 200 mm
Stop Start Stop
[mm] [mm] [mm]
115 400 55
115 400 55
150 435 90
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