Product Description; Proper Use And Fields Of Application - Wilo Sub TWU 3 Série Notice De Montage Et De Mise En Service

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4 Product description

The product has been manufactured with great care
and is subject to constant quality controls. Trouble-
free operation is guaranteed if it is installed and main-
tained correctly.

4.1 Proper use and fields of application

Submersible motor pumps are suitable for the follow-
ing applications:
• For supplying water from bore holes, wells and cisterns
• For private water supplies and irrigation
• For pumping water without fibrous or abrasive materi-
als
Submersible motor pumps must not be used for
pumping:
• Waste water
• Sewage/feces
• Raw sewage
Beware of electrical current
When using the product in swimming pools or
other accessible pools, there is a risk of fatal
injury due to electrical current. Note the follow-
ing information:
Use is strictly forbidden if there are people in the
pool!
If there are no people in the pool, protective
measures
DIN VDE 0100-702.46
national regulations).
Proper use also includes observation of these instruc-
tions. Any other use is regarded as improper.
4.1.1 Drinking water supply
When used for supplying drinking water, local regula-
tions, laws and guidelines must be checked as to
whether the product is suitable for this purpose.
4.2 Construction
The Wilo-Sub TWU... is a floodable submersible motor
pump, which can be operated both vertically and hori-
zontally when immersed in a stationary installation.
Fig. 1: Description
1 Cable
2 Intake port
3 Motor housing
4.2.1 Hydraulics
Multi-stage hydraulics with radial impellers arranged in
sections. The hydraulic housing and pump shaft are
made from stainless steel, while the rotors are made
from polycarbonate. The discharge-side connection is
designed as a vertical threaded flange with internal
thread and integrated return flow prevention.
The product is not self-priming, which means
that the pumped liquid must flow independently
30
must be taken according
(or the appropriate
4 Hydraulic housing
5 Discharge port
or with intake pressure and a minimum level of
submergence must be ensured at all times.
4.2.2 Motor
Rewindable oil-filled AC motors and three-phase
motors are used for direct start-up. The motor hous-
ing is made from stainless steel. The motors have a 3"
connection.
The motor is cooled by the pumped liquid. The motor
must therefore always be submerged when operated.
The limit values for the maximum media temperature
and minimum flow rate must be adhered to.
The connection cable is longitudinally waterproof and
connected to the motor using a detachable plug. The
design depends on the model type:
• TWU 3-...: Free cable ends
• TWU 3-...-P&P (Plug&Pump): With switching device
and safety plug
Note the IP protection class of the switching
device.
4.2.3 Sealing
The sealing between the motor and hydraulics is made
using a lip seal.
4.3 Functional principle of Plug&Pump systems
4.3.1 Wilo-Sub TWU 4-...-P&P/FC (Economy 1)
to
As soon as a tap is opened, the pressure in the line
drops. The unit starts as soon as the pressure drops
below 2.2 bar.
The unit pumps as long as a minimum pump flow is
present in the line. If the tap is closed, then the unit
switches off automatically after a few seconds.
The automated control mechanism protects the pump
from running dry (e.g. no water in the cistern) by
switching off the motor.
Display elements on the fluid control:
• Red LED lights up: Fault
The unit was switched off by the automated control
mechanism (e.g. dry-run protection). The malfunction
must be reset by pressing the RESET button
• Green LED lights up: Mains voltage is present, system is
ready for operation
• Yellow LED lights up: Unit is running
4.3.2 Sub-Sub TWU 4-...-P&P/DS (Economy 2)
During operation, the diaphragm vessel is filled with
water and condenses the nitrogen contained within.
The unit stops as soon as the set deactivation pres-
sure is reached by the pressure switch on the dia-
phragm vessel.
When a tap is opened, the diaphragm vessel pushes
additional water into the line. If the set activation pres-
sure is reached on the pressure monitor after the water
is drained, then the unit starts up and refills the pipe
and diaphragm vessel.
The pressure switch regulates the water pressure by
starting the unit. The current pressure can be read on
the manometer.
WILO SE 10/2011 V4.1WE