Connection Of Discharge Pipe; Adjustment Of Cable Length For Float Switch; Electrical Connection; Operation - Grundfos Unilift CC 5 Installation And Operating Instructions Manual

6.3 Connection of discharge pipe

The discharge pipe can be connected directly to the
pump discharge port or by means of the adaptor.
To prevent backflow through the pump when it stops,
the supplied non-return valve can be fitted in the
adaptor. The non-return valve is fixed when the
adaptor is fitted to the pump discharge port.
Fig. 6 Adaptor and non-return valve
(position and function)
The adaptor enables the connection of a pipe or
hose matching ¾", 1" and 1¼" external pipe thread
(G). Cut off the adaptor so that it matches the dis-
charge pipe diameter. If a system gasket is used
between the discharge pipe and the adaptor, the cut-
off adaptor must have an even and smooth surface.
The approval according to DIN EN 12 056-4 stipu-
lates that the pipe from the fixed installation must be
connected directly to the pump discharge port. If the
supplied adaptor is to be used, the ¾" and 1" sockets
must be cut off.
6.4 Adjustment of cable length for float
switch
The difference in level between start and stop can be
adjusted by changing the free cable length between
the float switch and the pump handle.
• An increased free cable length results in fewer
starts/stops and a large difference in level.
• A reduced free cable length results in more starts/
stops and a small difference in level.
In order that the float switch can start and stop the
pump, the free cable length must be min. 100 mm
and max. 200 mm.
Start
Stop
Fig. 7 Start/stop levels at min. and max. cable
lengths
8
Pump type
Unilift CC 5
Unilift CC 7
Unilift CC 9

6.5 Electrical connection

Supply voltage: 1 x 220-240 V, 50 Hz.
The electrical connection must be carried out in
accordance with local regulations.
Check that the mains voltage and frequency corre-
spond to the values stated on the pump nameplate.

7. Operation

7.1 Self-venting

A vent valve is built into the pump handle. The valve
allows air to escape from the pump in case the free
air flow through the discharge pipe is blocked. Once
the pump is vented, the valve normally closes.
If the pump sucks air or water with a high air content,
the valve may leak a mixture of air and water. This is
no fault but a natural consequence of the opening
and closing of the valve.

7.2 Manual operation

The pump is started and stopped by an external
switch.
To eliminate the risk of dry running, the water level
should be checked regularly during operation. This
can for instance be done by an external level control-
ler.
L
In order that the pump can self-prime when started,
the water level must be at least 25 mm.
When the pump sucks water, it can pump down to
20 mm water level.
For pumping to low level, see section 7.4.
Cable length (L)
min. 100 mm
Start Stop
[mm] [mm]
350 115
350 115
385 150
As a precaution, the pump must be con-
nected to a socket with earth connection.
It is recommended to fit the permanent
installation with an earth leakage circuit
breaker (ELCB) with a tripping current
< 30 mA.
Cable length (L)
max. 200 mm
Start Stop
[mm] [mm]
400 55
400 55
435 90