Ground Connection; Safety And Monitoring Devices; Safety Rules During Operation; Pumped Liquids - Wilo SUB TWU 3 Notice De Montage Et De Mise En Service

SAFETY
BEWARE of electromagnetic radiation!
Electromagnetic radiation can pose a fatal risk
for people with pacemakers. Put up appropri-
ate signs and make sure anyone affected is
aware of the danger!

2.7. Ground connection

Our pumps (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 pump
and the pumped liquid (for example on construc-
tion sites), the connection must be additionally
equipped with a residual current circuit breaker.
The pump units are submersible and conform to
protection class iP 58 in terms of the applicable
standards.
The protection class of the installed and/or
supplied switching devices can be found on the
device housing and in the operation manual.

2.8. Safety and monitoring devices

Our pumps can be equipped with mechanical
(e.g. intake strainer) and/or electrical (thermo
sensors, moisture sensors, etc.) safety and mon-
itoring devices. These devices must be attached
and connected.
Electrical devices such as thermo sensors or float
switches must be connected and tested by an
electrician before start-up.
Please note that certain devices require a relay to
function properly, for example a PTC thermistor
and PT100 sensor. This relay can be obtained
from the manufacturer or an electrical supply
dealer.
Personnel must be informed of the systems
used and how they work.
CAUTioN!
Never operate the pump if the safety and
monitoring devices have been removed or
damaged, or if they do not work.

2.9. Safety rules during operation

When operating the pump, always follow the
locally applicable laws and regulations for work
safety, accident prevention and handling elec-
trical machinery. To help to ensure safe working
practice, the responsibilities of employees should
be clearly set out by the owner. All personnel
are responsible for ensuring that regulations are
observed.
The pump has moving parts. During operation,
these parts turn to pump the fluid. Certain ma-
terials in the pumped fluid can cause very sharp
edges to form on the moving parts.
Installation and operating instructions Wilo-Sub TWU 3/High Speed
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 pump
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 compo-
sition, corrosiveness, abrasiveness, dry matter
content and in many other aspects. Generally, our
pumps can be used for many applications. Please
note that if requirements change (density, viscos-
ity or general composition), this can also affect
many parameters of the pump.
When using or replacing the pump in a different
pumped liquid, observe the following points:
• The motor is filled with oil. The pumped liquid
can be contaminated by this oil if the mechanical
shaft seal is defective.
• 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.
• Pumps that have been operated in dirty waste
water must be cleaned thoroughly before being
used for other pumped liquids.
• Pumps 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 pump can be
used at all with another pumped liquid.
• 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 pumps
are not designed for these liquids!

2.11. Sound pressure

Depending on the size and output (kW), the unit
generates a sound pressure of approximately
70 dB (A) to 110 dB (A).
The actual sound pressure, however, depends
on several factors. These include the installation
depth, configuration, fastening of accessories and
pipeline, operating point, immersion depth, etc.
Once the unit has been installed, we recommend
that the operator make additional measurements
under all operating conditions.
CAUTioN: Wear ear protectors!
in terms of the applicable laws and regu-
lations, ear protection must be worn if the
sound pressure is greater than 85 dB (A).
The owner is responsible for ensuring
compliance with these regulations.
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