Installation On Auto-Coupling; Free-Standing Installation; Setting Of Level Switch - Grundfos Unilift AP35B Installations- Und Bedienanleitung

When the pipe/hose has been connected, place the
pump in its operating position.
Note: Do not lift or lower the pump by means of the
electric cable.
Position the pump so that the pump inlet will not be
blocked or partly blocked by sludge, mud or similar
materials.
It is recommended to place the pump on a solid
base, see fig. 4.
Fig. 4
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In the case of permanent installation, the pit must be
cleared of sludge, pebbles, etc. before the pump is
installed.

4.3 Installation on auto-coupling

See figs. A and B, pages 99 and 100.
Pumps for permanent installation can be installed on
a stationary auto-coupling and operated completely
or partially submerged in the pumped liquid.
1. Drill mounting holes for guide rail bracket on the
inside of the pit and fasten the guide rail bracket
provisionally with two screws.
2. Place the auto-coupling base unit on the bottom
of the pit. Use a plumb line to establish the cor-
rect positioning. Fasten with heavy-duty expan-
sion bolts. If the bottom of the pit is uneven, the
auto-coupling base unit must be supported so
that it is level when being fastened.
3. Assemble the discharge line in accordance with
the generally accepted procedures and without
exposing the line to distortion or tension.
4. Insert the guide rails in the rings of the auto-cou-
pling base unit and adjust the length of the rails
accurately to the guide rail bracket.
5. Unscrew the provisionally fastened guide rail
bracket, fit it on top of the guide rails and finally
fasten it firmly to the pit wall.
Note: The guide rails must not have any axial play
as this would cause noise during pump operation.
6. Clean out debris from the pit before lowering the
pump into the pit.
7. Fit the auto-coupling half on to the discharge port
of the pump. Then slide the guide bar of this cou-
pling half between the guide rails and lower the
pump into the pit by means of a chain. When the
pump reaches the auto-coupling base unit, the
pump will automatically connect tightly.
8. Hang up the end of the chain on a suitable hook
at the top of the pit.
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9. Adjust the length of the motor cable by coiling it
up on a relief fitting, so the cable is not damaged
during operation. Fasten the relief fitting to a suit-
able bracket at the top of the pit. Make sure that
the cables are not sharply bent or pinched.
Note: The end of the cable must not be submerged,
as water may penetrate through the cable into the
motor.

4.4 Free-standing installation

See fig. C, page 101.
For free-standing installation of the pumps, fit a 90°
elbow to the discharge port. The pump can be in-
stalled 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 sepa-
ration.
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, the union or coupling, non-
return valve and isolating valve should be fitted in
the sequence mentioned, as seen from the pump
side.
Lower the pump into the liquid.
If the pump is installed in muddy conditions or on un-
even ground, it is recommended to support the pump
on bricks.

4.5 Setting of level switch

Intermittent operation:
For pumps supplied with a level switch, the differ-
ence in level between start and stop can be set by
adjusting the free cable between the level switch and
the pump handle.
The longer the length of free cable, the larger the dif-
ference in level between start and stop.
The pump is allowed to run for maximum 5 minutes
per 30 minutes without the motor being submerged
in the liquid.
Fig. 5
Continuous operation:
During continuous operation, the pump must always
be completely covered by the pumped liquid.
Stop
270 mm