General; Installation Methods; Installation; Motor Filling - Wilo Sub TWU 3 HS Serie Einbau- Und Betriebsanleitung

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5.1. General

In the event of pumping through longer discharge
pipelines (particularly in the case of longer as-
cending pipes), pressure surges can occur.
Pressure surges can result in destruction of
the pump/system and noise pollution due to
flap knock. Water hammers can be reduced
or prevented by applying suitable measures
(e.g. non-return valves with an adjustable closing
time, electrically actuated shut-off devices, spe-
cial routing of the discharge pipeline).
If you are using level control, make sure that the
minimum water coverage is present. Air pockets
in the hydraulic housing or piping system must
be avoided at all costs and must be removed
using a suitable ventilation system. Protect the
submersible pump from frost.

5.2. Installation methods

• Vertical stationary installation, immersed
• Horizontal stationary installation, immersed –
only in conjunction with a cooling jacket!

5.3. Installation

DANGER of falling!
When installing the pump and its accessories,
work is sometimes performed directly at the
edge of the well or tank. Lack of care and/
or incorrect choice of clothing can result in
falling. There is a risk of fatal injury! Take all
necessary safety precautions to prevent this.
The following information should be taken into
consideration when installing the pump:
• This work must be carried out by a qualified
person and electrical work must be carried out by
an electrician.
• The collector tank must be clean, free of coarse
solids, dry, frost-free and, if necessary, de-
contaminated. It must also be suitable for the
particular pump. There must be sufficient water
inflow for the submersible pump's maximum out-
put in order to prevent dry run and/or air intake.
• When working in tanks, wells or boreholes, a sec-
ond person must be present for safety reasons.
Take the necessary countermeasures if there is
a risk of poisonous or suffocating gases collect-
ing!
• Ensure that lifting equipment can be fitted
without any trouble, since this is required for
assembly and removal of the pump. It must be
possible to reach the pump safely in its operating
and storage locations using the lifting equip-
ment. The machine must be positioned on a firm
bearing surface. For transporting the pump, the
load-carrying equipment must be secured to the
prescribed lifting eyelets. When using chains,
these must be connected to the lifting eyelets
using a shackle. Only structurally approved lifting
gear may be used.
• Power supply cables must be laid out in such
a way that safe operation and trouble-free
36
assembly/dismantling are possible at all times.
The pump must never be carried or dragged by
the power supply cable. Check whether the cable
present is long enough for its cross-section and
its installation type.
• When using switchgears, the corresponding
protection class must be observed. In general,
switchgear must be installed overflow-proof.
• Structural components and foundations must
be sufficiently stable to allow the product to be
anchored securely and functionally. The operator
or the supplier is responsible for the provision of
the foundations and their suitability in terms of
dimensions, stability and strength.
• Check the available planning documentation (in-
stallation plans, design of operating space, inlet
conditions) is complete and correct.
• Please observe all regulations, rules and legal
requirements for working with and underneath
heavy suspended loads. Wear appropriate protec-
tive clothing/equipment.
• Please also observe the applicable national acci-
dent prevention regulations and trade association
safety provisions.
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.

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 sen-
4 sor (to be provided by
the customer)
INSTALLATION
External frequency
5
converter
6 Tap
7 Main switch
Diaphragm expansion
8
tank
WILO SE 05/2014 Ed.04 DIN A4