Description And Function; Electrical Connection - Wilo Sub TWU 4 Instrucciones De Instalación Y Funcionamiento

• WILO-ER switchgear (motor protection + water
level monitor)
• Motor cable:as a kit (including plug) or by the
metre (without plug)
• Shrinkage hoses or encapsulation sleeves (for
extending the motor cable)
• Pressure vessel, tank

6 Description and function

6.1 Description of the pump (Fig. 4)
Item Component description
1 Pump Wilo-Sub TWU4", DM type
2 Submersion electrode dimensions
3 Low water submersion electrode
4 Upper level submersion electrode
5 Connecting cable
6 Dynamic level (pump in operation)
7 Static level (pump switched off)
8 ER switchbox (with dry-running protection
system)
9 Electrical supply connection
10 Pressure switch with pressure gauge
11 Pressure vessel/tank
12 Check valve
13 Non-return valve
Fully submersible, multistage submersible pump
with radial (size 02.. and 04..) or semi-axial (size
08.. and 16..) impellers in a sectional construction.
Pressure housing, jacket pipe, graduated jacket
and suction strainer in stainless steel. Built-in
non-return valve in pump head. All the parts in
contact with the fluid are made in a corrosion-free
material.
Corrosion-free AC or three-phase motor with lac-
quer-insulated windings in hermetically sealed
stator for direct starting with self-lubricating
bearings
The motor is cooled by transmitting the waste
heat to the fluid around the outside jacket of the
motor. The minimum flow speed of the fluid along
the motor is 10cm/sec.
7 Installation and electrical connection
DANGER! Mortal danger
Incorrect installation and electrical connection
can be fatal.
• Installation and electrical connection work may
only be done by qualified personnel in accord-
ance with the regulations in force.
• Accident prevention regulations must be
observed
Installation and operating instructions Wilo-Sub TWU4
7.1 Installation.
CAUTION! Risk of damage!
The product may be damaged if it is not handled
correctly.The boreholes or pump stations must
be made and installed according to the general
technical rules in force.
CAUTION! Risk of damage!
In the case of an installation in a > 4" borehole, a
horizontal tank or >4" deep well, a water control
jacket must be fitted around the pump and
motor in order to guarantee adequate cooling of
!
the motor (Fig. 5)
• The water supply in the borehole or well must be
adequate for the flow rate of the pump.
• The pump is lowered with the aid of a block and
pulley with chain and tripod. A cable winch must
be used for heavy pumps.
• The pump must never be allowed to run
dry.Therefore, it must be ensured that even in dry
periods, the water level never drops below the top
surface of the unit.
• A constant inside pipe diameter of 4" must be
guaranteed to make sure that the pump can be
lowered freely.
• The pump must never be lowered or raised by the
electric cable.
• The electrical connection and also the extension
of the motor cable must be done before the pump
is lowered.
• The pump must be installed at least 0.30 m above
the bottom of the well or borehole.(Fig. 4).
• The installation type plate must be located in the
vicinity of the borehole in order to have access to
the technical data of the installation.
• Before lowering the pump (and during lowering in
the case of deep boreholes), the insulation resist-
ance must be checked at the motor and at the
Ω
cable (min. 2 M ).
• For series TWU 4 with high flow rate, it is advanta-
geous to install a 6" borehole.
• The pump can be used by means of a rigid or flex-
ible pipe with a nominal diameter of 1¼" or 2",
depending on the pump type.
• If flexible pipes are used, the pump must be held
by a securing cable. Use the two steel eyes on the
pump head.
• It is recommended that an additional non-return
valve and also a check valve are provided at the
borehole outlet.
CAUTION! Risk of damage!
With increased water pressure (>180 m water
column), a non-return valve must be installed
directly at the pump outlet. The non-return
valve must be designed for an admissible oper-
ating pressure of at least 20 bar.

7.2 Electrical connection

DANGER! Mortal danger
If the electrical connection is not made cor-
rectly, there is a risk of a fatal shock.
Only allow the electrical connection to be made
by an electrical contractor approved by the
English
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