Product Description - Wilo Sub TWU 4 Serie Instrucciones De Instalación Y Funcionamiento

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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
The submersible motor pumps are suitable for:
• Water supplies from drilled holes, wells and cisterns
• Private water supplies, sprinkler and flood irrigation
• Increasing the pressure
• Lowering the water table
• Pumping water without long-fibered and abrasive
components
The submersible motor pumps must not be used for
pumping the following:
• 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 any persons are in the
pool!
If the pool is unoccupied, protective measures
must be taken according to DIN VDE 0100-
702.46 (or the appropriate national regulations).
Proper use also includes observation of these instruc-
tions. Any other use is regarded as improper.
4.1.1 Pumping of drinking water
When using to pump drinking water, the locally appli-
cable guidelines/laws/regulations should be reviewed
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
Multistage hydraulics with radial or semi-radial rotors in
a sectional design. The hydraulic housing and pump
shaft are made of stainless steel; the rotors are made
of Noryl. The discharge side connection is designed as
a vertical threaded flange with inner thread and inte-
grated backflow preventer.
The product is not self-priming, in other words,
the pump medium must flow with primary pres-
34
4 Hydraulic housing
5 Discharge port
sure or taper automatically and a minimum level
of submergence must always be ensured.
4.2.2 Motor
AC or three-phase motors filled with a water-glycol
mixture are used for direct start-up. The motor hous-
ing is made of stainless steel. The motors have a 4"
Nema connector.
The motor is cooled by the pumped medium. The
motor must therefore always be submerged when
operated. The thresholds for max. liquid temperature
and minimum flow speed may not be exceeded.
The connection cable is longitudinally water-proof and
fixedly connected to the motor. The version will
depend on the particular type:
• TWU 4- ...: with free cable ends
• TWU 4-... P&P (Plug&Pump): with switching device and
shockproof plug
• TWU 4-... QC: Connection cable with QuickConnect
linkage for fast and easy installation of QuickConnect
cable assembly kits; cables with free ends
Note the IP protection class of the switching
device.
4.2.3 Sealing
The seal between motor and hydraulics is made by a
rotary shaft seal, or a floating ring seal (for motors of
2.5 kW or greater).
4.3 Functional principle of Plug&Pump systems
4.3.1 Wilo-Sub TWU 4-...-P&P/FC (Economy 1)
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
WILO SE 10/2011 V4.1WE