Wilo SUB TWU 3- -HS Série Notice De Montage Et De Mise En Service page 37

INSTALLATION
In this installation method, the submersible
pump is installed directly on the ascending pipe.
The installation depth is determined by the length
of the ascending pipe. In narrow well shafts,
a centring device must be used because the pump
must not come into contact with the walls of the
well as this could damage the cable and pump.
Use hoisting gear with sufficient bearing capacity.
The motor must not sit on the bottom of the well
as this can lead to tensions and slagging of the
motor. This would mean that heat dissipation
is no longer guaranteed and the motor could
overheat.
In addition, the pump should not be installed at
the same height as the filter pipe. The intake cur-
rent can draw up sand and solid material, which
would mean that the motor cooling is no longer
guaranteed. This would result in increased wear of
the hydraulics. To prevent this, it may be neces-
sary to use a cooling shroud or install the pump in
the vicinity of unperforated well casings.
NOTE:
The following information must be observed
when installing threaded pipes:
• The threaded pipes must be screwed into each
other leak-tight and firmly. To achieve this, wrap
the spigot with hemp or Teflon tape.
• When screwing in the pipes, make sure that the
pipes are aligned (not tilted) to ensure that the
thread is not damaged.
• Note the submersible pump's direction of rota-
tion and use suitable threaded pipes (right-hand
or left-hand thread) so that the pipes do not
become loose during operation.
• The threaded pipes must be secured against
accidental loosening.
1. Screw the individual pipes together.
2. Extend the power supply cable connected at the
factory to the necessary length, according to the
available space in the borehole, using a shrinkage
hose or cast resin connection:
• TWU 3-...-ECP: to the frequency converter's
installation location
Use a round cable to extend the cable; this
ensures that the cable inlet on the frequency
converter seals properly.
• TWU 3-...-I: to the switchbox/main switch
3. Check the insulation resistance
To check the insulation resistance, use an in-
sulation tester (measuring voltage is 500 V) to
measure the resistance of the motor winding and
the power supply cable. The resistance must not
fall below the following values:
• At initial commissioning: min. 20 MΩ
• During further measurements: min. 2 MΩ
If the insulation resistance is too low, it is possi-
ble that moisture has penetrated into the power
supply cable and/or motor. Do not connect the
pump again and consult the manufacturer.
Installation and operating instructions Wilo-Sub TWU 3/High Speed
4. Fit the piping to the pump's pressure connection.
5. Route the power supply cable along the piping.
Always fasten the cable below and above a pipe
adaptor, using a cable clip.
6. Fit a mounting bracket to the pressure connec-
tion of the last pipe and fit a supporting clamp
below the flange.
Make sure that the cable is not damaged by the
supporting clamp. The cable must always be laid
outside the supporting clamp.
7. Fasten the lifting equipment to the mounting
bracket and hoist the entire unit.
8. Pivot the unit over the borehole and lower it
slowly.
Make sure that the cable and the wall of the
well are not damaged.
9. Place two scantlings over the well shaft. Lower
the unit until the supporting clamp is in resting on
the scantlings.
10. Disassemble the mounting bracket from the
discharge pipe and fit the well closure (e.g. well
cover) on the discharge pipe.
WARNING: Danger of crushing!
During installation, the entire weight of the
unit is borne by the lifting equipment and the
bearer cable maybe under tension. This can
result in severe crushing! Before disassem-
bling the mounting bracket, make sure that
the bearer cable is NOT under tension.
11. Fasten the lifting equipment to the well closure
and hoist the entire unit (consisting of the pump,
piping and well closure).
12. Disassemble the supporting clamp, remove the
scantlings and lay the power supply cable through
the well closure to the outside.
13. Place the unit on the well and fasten the well
closure.
14. Fit the discharge pipeline to the tap on the well
closure and lay the power supply cable to the
switchbox.
Installing piping for deep wells
Long piping is needed for deep wells. With
lengths of 10 m or more, impermissible bending
tension may occur when lifting the piping and it
may become damaged.
To prevent this, the piping must be installed suc-
cessively in short lengths.
To do this, the individual sections (recommen-
dation: max. 3 m) are lowered into the borehole
and installed one after the other. This way, longer
piping can be installed for deep wells without any
problems.
Installing flexible piping
The pump can also be used with flexible piping
(e.g. hoses). In this case, the piping is fitted to the
pressure connection and then lowered into the
borehole together with the pump.
English
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