Ground Connection; Safety And Monitoring Devices; Safety Rules During Operation; Pumped Liquids - Wilo Sub TWU 4 Serie Instrucciones De Instalación Y Funcionamiento

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equipment may cause malfunctions in the sys-
tem.
Beware of electromagnetic radiation!
Electromagnetic radiation can pose a fatal risk
for people with pacemakers. Put up appropriate
signs and make sure anyone affected is aware of
the danger!

2.7 Ground connection

Our products (unit including protective devices and
control station, auxiliary hoisting gear) must always be
grounded. If there is a possibility that people can come
into contact with the product and the pumped liquid
(e.g. at construction sites), the connection must be
additionally equipped with an earth leakage protection
device.
The pump units are submersible and conform to
protection class IP 68 in terms of the applicable
standards.
The protection class of the installed switching
devices can be found on the device housing and
corresponding operation manual.

2.8 Safety and monitoring devices

Our products can be equipped with mechanical (e.g.
intake strainer) and/or electrical (e.g., thermo sensors,
moisture sensors, etc.) safety and monitoring devices.
These devices must be attached or connected.
Electrical devices such as thermo sensors, float
switches, etc. must be connected and checked by an
electrician for proper functioning before start-up.
Please note that certain devices require a relay to func-
tion properly, e.g. PTC thermistor and PT100 sensor.
This relay can be obtained from the manufacturer or an
electrical supply dealer.
Personnel must be informed of the installations
used and how they work.
Caution!
Never operate the product if the safety and
monitoring devices have been removed or dam-
aged, or if they do not work.

2.9 Safety rules during operation

When operating the product, always follow the locally
applicable laws and regulations for work safety, acci-
dent prevention and handling electrical machinery. To
help to ensure safe working practice, the responsibili-
ties of employees should be clearly set out by the
owner. All personnel are responsible for ensuring that
regulations are observed.
The product has moving parts. During operation, these
parts turn to pump the fluid. Certain materials in the
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pumped fluid can cause very sharp edges to form on
the moving parts.
Beware of rotating parts!
The rotating parts can crush and sever limbs.
Never reach into the hydraulics or the moving
parts during operation. Switch off the product
and let the moving parts come to a stop before
maintenance or repair work!

2.10 Pumped liquids

Each pumped liquid differs in respect of composition,
corrosiveness, abrasiveness, dry matter content and in
many other aspects. Generally, our products can be
used for many applications. Please note that if require-
ments change (density, viscosity or general composi-
tion), this can also affect many parameters of the
product.
When using or replacing the product in a different
pumped liquid, observe the following points:
• When used in drinking water applications, all the parts
that come into contact with the fluid must be suitable
for use with drinking water. This must be checked
according to local laws and regulations.
• Products that have been operated in dirty waste water
must be cleaned thoroughly before being used for
other pumped liquids.
• Products that have been operated in sewage water
and/or fluids that are hazardous to health must be
decontaminated before being used with other pumped
liquids.
It must be clarified, whether the product can be
used at all with another pumped liquid.
• If a product is operated with a lubricant or cooling fluid
(such as oil), the pumped liquid can be contaminated
by these substances if the mechanical shaft seal is
defective.
• It is strictly prohibited to pump explosive or highly
flammable liquids in pure form!
Danger - explosive liquids!
It is strictly prohibited to pump explosive liquids
(gasoline, kerosene, etc.). The products are not
designed for these liquids!

2.11 Sound pressure

Depending on the size and capacity (kW), the prod-
ucts produce a sound pressure of approximately 70 dB
(A) to 110 dB (A).
The actual sound pressure, however, depends on sev-
eral factors. These include, for example, the installation
depth, configuration, fastening of accessories and
pipeline, operating point, immersion depth, etc.
Once the product has been installed, we recommend
that the operator make an additional measurement
under all operating conditions.
Caution: Wear ear protectors!
In terms of the applicable laws and regulations,
ear protection must be worn if the sound pres-
sure is greater than 85 dB (A)! The operator is
responsible for ensuring compliance with these
regulations!
WILO SE 10/2011 V4.1WE