Cable Clips; Lowering The Pump; Installation Depth - Grundfos SP Installation And Operating Instructions Manual

8.6 Cable clips

Fit cable clips every 3 metres to fix the submersible drop cable and
the straining wire, if fitted, to the riser pipe of the pump.
Grundfos supplies cable clip sets on request.
1. Cut off the rubber band so that the piece with no slit becomes as
long as possible.
2. Insert a button in the first slit.
3. Position the wire alongside the submersible drop cable as
shown in fig. Fitting the cable
Fitting the cable clips
4. Wind the band once around the wire and the cable. Then wind it
tightly at least twice around the pipe, wire and cable.
5. Push the slit over the button, and cut off the band.
When cables with a large cross-section are used, it will be
necessary to wind the band several times.
When plastic pipes are used, some slackness must be left between
each cable clip as plastic pipes expand when loaded.
When flanged pipes are used, the cable clips must be fitted above
and below each joint.

8.7 Lowering the pump

DANGER
Electric shock
Death or serious personal injury
‐
Switch off the power supply before starting any work
on the product.
‐
Make sure that the power supply cannot be
accidentally switched on.
Do not lower or lift the pump by means of the motor cable.
Grundfos recommends checking the borehole by means of an
inside calliper before lowering the pump to ensure unobstructed
passage.
Lower the pump carefully into the borehole, taking care not to
damage the motor cable and the submersible drop cable.
clips.

8.8 Installation depth

The dynamic water level must always be above the suction
interconnector of the pump. See section
and fig. Comparison of various water
Minimum inlet pressure is indicated in the NPSH curve for the
pump. The minimum safety margin must be 0.5 metre head.
We recommend that you install the pump so that the motor part is
above the well screen in order to ensure optimum cooling. See
section Liquid temperatures and motor
When the pump has been installed to the required depth, the
installation must be finished by means of a borehole seal.
Loosen the straining wire so that it becomes unloaded and lock it to
the borehole seal by means of wire locks.
For pumps fitted with plastic pipes, the expansion of the
pipes when loaded must be taken into consideration,
when deciding on the installation depth of the pump.
Related information
5.2 Positional requirements
5.4 Liquid temperatures and motor cooling
9.1 Startup
Positional requirements
levels.
cooling.
21