Wilo Sub TWU 3 HS Serie Notice De Montage Et De Mise En Service page 38

English
NOTE:
• To achieve the necessary cooling, the pump
must always be immersed when in operation.
The minimum water submersion must be en-
sured at all times!
• Never let the pump run dry! If the water level
fluctuates strongly, we recommend installing
additional dry-running protection!
• No additional non-return valve may be used on
the pressure side. This would result in system
malfunction.
• A diaphragm expansion tank (1 – 2 litres) must
be installed between the frequency converter
and the tap. This minimises the number of starts
in the event of small leaks in the pipe system.
• TWU 3-...-ECP:
Before lowering the pump, note the rated cur-
rent specifications on the motor rating plate!
This value marks the maximum permissible
default value for the operating parameter Imax.
When commissioning the pump, Imax must be
entered on the external frequency converter,
also see section 3.5
5.3.1 Motor filling
The motor is filled ex works with food-safe white
oil that is potentially biodegradable. This oil filling
guarantees that the pump is frost-proof at tem-
peratures down to -15 °C.
The motor is designed in such a way that it can-
not be filled from outside. Only the manufacturer
can fill the motor.
5.3.2 Vertical installation of the pump
Fig. 3: Installation
1 Unit
2 1" -> 1¼" adaptor
3 Switchgear
Separate pressure
4 sensor (to be installed
on-site)
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 dissipa-
tion 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
38
External frequency
5
converter
6 Tap
7 Main switch
Diaphragm expansion
8
tank
guaranteed. This would result in increased wear of
the hydraulics. To prevent this, it may be neces-
sary to use a cooling jacket or install the pump in
the vicinity of unperforated well casings.
NOTE:
Note the following when installing
threaded pipes:
• The threaded pipes must be screwed into each
other leak-tight and firmly. To achieve this, wrap
the threaded pin 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 heat-shrink
tubing or a 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 insulation resistance is too low, it is possible
that moisture has penetrated into the power
supply cable and/or motor. Do not connect the
pump again and consult the manufacturer!
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!
INSTALLATION
WILO SE 05-2019 DIN A4