Grundfos UNILIFT AP35B Installation And Operating Instructions Manual Download Page 9

Page: 9 / 204

English (GB)

4.3 Installation on auto coupling

See figs A and B, pages

and

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
correct positioning. Fasten with heavy-duty
expansion 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 outlet line in accordance with the

generally accepted procedures and without
exposing the line to distortion or tension.

4. Knock the guide rails on to the spigots of the

bottom part of the auto coupling. Bevel the inside
of the guide rails to facilitate installation. The
guide rails must fit tightly on the spigots. We
recommend 3/4" medium size pipes as guide
rails.

5. Adapt the length of the guide rails to fit precisely

the bracket at the top.

6. Unscrew the provisionally fastened guide rail

bracket, fit it on top of the guide rails and finally
fasten it firmly to the pit wall.

7. Clean out debris from the pit before lowering the

pump into the pit.

8. Fit the auto-coupling half on to the outlet of the

pump. Then slide the guide bar of this coupling
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.

9. Hang up the end of the chain on a suitable hook

at the top of the pit.

10. 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
suitable bracket at the top of the pit. Make sure
that the cables are not sharply bent or pinched.

4.4 Free-standing installation

See fig. C, page

198

For free-standing installation of the pumps, fit a 90 °
elbow to the outlet. 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 outlet pipe 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 outlet.
If a rigid pipe is used, the union or coupling, non-
return valve and isolating valve must 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
uneven ground, we recommend that you support the
pump on bricks.

4.5 Setting of level switch

Intermittent operation

For pumps supplied with a level switch, the
difference 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
difference 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

Setting of level switch

Continuous operation

During continuous operation, the pump must always
be completely covered by the pumped liquid.

Note

The guide rails must not have any axial
play as this would cause noise during
pump operation.

Note

The end of the cable must not be
submerged, as water may penetrate
through the cable into the motor.

03 419

2 180

270 mm

Stop