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9.2 Fitting the sleeve
1. Fold the sleeve and insert it into the hole (from the outside of
the pit).
2. Unfold the sleeve so that it lies evenly in the hole.
3. LM50/100 sleeves: Pull the sleeve outwards until its collar
touches the inside of the pit all around the hole.
L965 sleeves: Pull the sleeve outwards until its collar touches
the inside of the pit at the positions 3 and 9 o'clock.
See fig. 20.
4. Lubricate the inside of the sleeve with a water-based lubricant.
5. Chamfer the pipe and press it home.
LM50/100 sleeves: Push the inlet pipe through the sleeve.
See fig. 18.
As it must be possible to pull the pump up
Note
through the pit, the inlet pipe must not project
beyond the sleeve by more than 5 cm.
Pit side
Max. 5 cm
Fig. 18 Pipe with LM50/100 sleeve, seen from side
L965 sleeves: Push the inlet pipe into the sleeve and against the
stop. See fig. 19.
Pit side
Fig. 19 Pipe with L965 sleeve, seen from side
Pit side
Fig. 20 Pipe with L965 sleeve, seen from top
9.3 Installation of pump
Some versions come without the pump installed. For installation
and start-up of the pump, see the installation and operating
instructions of the pump.
Lower the pump carefully into the pit in order to
Caution
avoid damage to pump and pit.
12
9.4 Pipework with flange connections
If the pit is to be installed at a temperature below
0 °C, slacken all bolts of the flange and retighten
Note
them when the pit has been installed.
This prevents stress in the pipes.
9.5 Fitting the chain
In the case of pumps on auto coupling, we recommend to fit the
chain in the foremost lifting eye of the lifting bracket. The number
of lifting eyes depends on the pump.
Fig. 21 Chain fitted to pump
Warning
The lifting equipment used for lifting the pump
must be rated for the weight of the pump and
approved according to local regulations.
10. Pump control
When installing the level switches, the following points should be
observed:
•
To prevent air intake and vibrations in the pump, the stop level
switch must be fitted in such a way that the pump is stopped
before air is sucked into the pump.
•
In the case of 1-pump operation, the start level switch should
be installed in such a way that the pump is started at the
required level; however, the pump must always be started
before the liquid level reaches the lower edge of the bottom
inlet pipe.
•
In the case of 2-pump operation, the start level switches
should be installed in such a way that pump 2 is started before
the liquid level reaches the lower edge of the bottom inlet pipe
to the pit, and so that pump 1 is started correspondingly
earlier.
•
The high-level alarm switch should always be installed about
10 cm above the start level switch; however, the alarm must
always be given before the liquid level reaches the inlet pipe.
For further settings, see the installation and operating instructions
for the pump controller selected.
10.1 Start and stop levels
The effective volume of the pump pit must be so large that the
number of starts does not exceed the maximum permissible
number. See the installation and operating instructions of the
pump.
10.2 Installation of level controller
See the installation and operating instructions of the controller.
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