Pipework Connection; Start-Up; Operation; Minimum Flow Rate - Grundfos SQ Instrucciones De Instalación Y Funcionamiento

Cable termination kit, type KM
Cross-sectional area
1.5 to 2.5 mm²
4.0 to 6.0 mm²
For larger cross-sections, please contact GRUND-
FOS.

5.8 Pipework connection

If a tool, e.g. a chain pipe wrench, is used when the
riser pipe is fitted to the pump, the pump must only
be gripped by the pump discharge chamber.
When connecting plastic pipes, a compression
coupling should be used between the pump and the
first pipe section.
Note: For pumps fitted with plastic pipes, the expan-
sion of the pipes when loaded should be taken into
consideration, when deciding on the installation
depth of the pump.
Where flanged pipes are used, the flanges should
be slotted to take the submersible drop cable.
Figure 11 shows a pump installation with indication
of:
• position of cable clips, pos. 1, and distance be-
tween the clips.
• fitting of straining wire, pos. 2.
• maximum installation depth below the static water
level.
Fig. 11
1
2
5.8.1 Cable clips
Cable clips must be fitted every 3 metres, see fig. 11.
Product number
When connecting plastic pipes, some slackness
96 02 14 62
must be left between each cable clip as plastic pipes
expand when loaded.
96 02 14 73
Where flanged pipes are used, the cable clips
should be fitted above and below each joint.
5.8.2 Installation depths
Maximum installation depth below the static water
level: 150 metres, see fig. 11.
Minimum installation depths below the dynamic
water level:
• Vertical installation:
During start-up and operation, the pump must al-
ways be completely submerged in water.
• Horizontal installation:
The pump must be installed and run at least
0.5 m below the dynamic water level.
If there is a risk that the pump might be covered
by mud, the pump must always be fitted in a flow
sleeve.
5.8.3 When lowering the pump into the
It is recommended to secure the pump by an
unloaded straining wire, see fig. 11, pos. 2.
Slacken the straining wire so that it becomes
unloaded and lock it to the borehole seal by means
of wire locks.
Note: The straining wire must not be used for pulling
the pump with riser pipe out of the borehole.
Note: Do not lower or lift the pump by means of the
motor cable.
3 metres

6. Start-up

Make sure that the well is capable of yielding a mini-
mum quantity of water corresponding to the pump
capacity.
Do not start the pump until it is completely sub-
merged in the liquid.
Start the pump and do not stop it until the pumped
liquid is completely clean, as otherwise the pump
parts and the non-return valve may choke up.

7. Operation

7.1 Minimum flow rate

To ensure the necessary cooling of the motor, the
Max. pump flow rate should never be set to a value lower
than 50 l/h.
150 m
If the flow rate suddenly falls, the reason might be
that the pump is pumping more water than the bore-
hole can yield. The pump must be stopped and the
Max.
fault corrected.
150 m
Note: The pump dry-running protection is effective
only within the recommended duty range of the
pump.
borehole
9