Free-Standing Installation; Adjustment Of Cable Length For Float Switch; Operation; Starting - Grundfos Unilift AP35B Notice D'installation Et De Fonctionnement

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 Free-standing installation

See fig. A, page 29.
For free-standing installation of the pumps, fit a 90 °
elbow to the discharge port. The pump can be
installed with a hose or rigid pipe and valves.
In order to facilitate service of the pump, fit a flexible
union or coupling to the discharge line for easy
separation.
If a hose is used, make sure that the hose does not
buckle and that the inside diameter of the hose
matches that of the discharge port.
If a rigid pipe is used, fit the union or coupling,
non-return valve and isolating valve in the order
mentioned, as seen from the pump side.
Lower the pump into the liquid.
If the pump is installed in muddy conditions or on
uneven ground, we recommend you to support the
pump on bricks.
8.5 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"
(100 mm) and max. 14" (355 mm).
The stop level must be above the pump inlet 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
500 mm
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

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 pump must be below the
surface of the liquid. See fig. 6.
• The pump is placed on a base so that the pump
inlet 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 8.5 Adjustment
of cable length for float switch.
Start
10.5" (267 mm)
Cable length Cable length
Min. 4"
(100 mm)
Start Stop Start
19.7" 11.8" 21.7"
300 mm 550 mm
Stop
10.5"
Max. 14"
(355 mm)
Stop
4"
100 mm