Pump Location; Adjustment Of Cable Length For Float Switch; Operation; Starting - Grundfos Unilift AP12 Installation And Operating Instructions Manual

8.3 Pump location

The pump can be used in the vertical or the
horizontal position with the discharge port as the
highest point of the pump. See fig. 4.
During operation, the suction strainer must always
be completely covered by the pumped liquid.
Fig. 4 Pump positions
When the pipe/hose has been connected, place the
pump in its operating position.
Do not lift the pump by the power cable.
Lift the pump by means of a wire or
Caution
chain secured to the pump handle.
Position the pump so that the suction strainer will not
be blocked or partly blocked by sludge, mud or
similar materials.
In the case of permanent installation, the well must
be cleared of sludge, pebbles, etc. before the pump
is installed.
We recommend you to place the pump on a solid
base, see fig. 5.
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Fig. 5 Pump placed on a plate
8.4 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 will result in fewer
starts/stops and a large difference in level.
• A reduced free cable length will result in more
frequent 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. 4" and
max. 14".
The stop level must be above the suction strainer to
prevent the pump from taking in air.
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Fig. 6 Start/stop levels
The start/stop levels vary according to the cable
length.
Unilift AP
Manual operation can be achieved in one of two
ways:
• Unplug both the pump and float switch from the
wall socket. Insert the pump plug into the wall
socket.
• Keep the float switch in a high position by fixing it
to the discharge pipe/hose.

9. Operation

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9.1 Starting

Before starting the pump, check that the following
requirements are fulfilled:
• The pump is submerged in the liquid. During
normal operation, the suction strainer must be
below the surface of the liquid.
• The pump is placed on a base so that the suction
strainer is not blocked by silt, mud or similar
materials.
• The pipe/hose connection is tight.
• The discharge pipe is open (hose not bent, etc.).
• The pump is connected to the power supply in
accordance with the instructions.
• The float switch can move freely.
After start-up:
1. Switch on and check:
– that the pump is operating properly
– that water is being pumped.
2. Check that the float switch will allow the pump to
pump down to a level of approximately 4". To
pump out below this level, fasten the float switch
in the manual position. See 8.4 Adjustment of
cable length for float switch.
Min./max.
cable length
Start
Stop
Cable length Cable length
Min. 4" Max. 14"
Start Stop Start
19.7" 11.8" 21.7"
Stop
4"
7