Decommissioning/dismantling en
Installation and operating instructions Wilo-Rexa UNI 21
▪Installation-/dismantling: The technician must be
trained in the use of the necessary tools and mounting
materials for the relevant construction site.
8.2 Operator responsibilities
▪Locally applicable accident prevention and safety regu-
lations of trade associations.
▪Observe regulations for working with heavy loads and
under suspended loads.
▪Provide the necessary protective equipment and make
sure that the personnel wears it.
▪Provide adequate aeration in closed rooms.
▪Take immediate countermeasures if there is a build-up
of toxic or suffocating gases!
8.3 Decommissioning
The pump is deactivated during decommissioning, but
remains installed. This ensures that the pump is always
ready for operation.
‡ To protect the pump from frost and ice, always im-
merse the pump completely in the fluid.
‡ Temperature of the fluid must always be above +3°C.
1. Switch off the pump at the operating point.
2. Secure the operating point against being switched on
again by unauthorised persons (e.g. lock main switch).
▶ The pump is out of operation and can now be dis-
mantled.
If the pump remains installed after decommissioning,
observe the following:
▪Ensure that the prerequisites for decommissioning are
maintained for the complete period of decommission-
ing. If these prerequisites cannot be guaranteed, dis-
mantle the pump after decommissioning!
▪For an extended period of decommissioning, carry out a
5-minute function test at regular intervals (monthly to
quarterly). CAUTION!A function test may only be car-
ried out under the applicable operating conditions. A
dry run is not permitted! Non-compliance can result
in irreparable damage!
8.4 Removal
DANGER
Danger due to fluids hazardous to health!
If the pump is used in fluids hazardous to health, de-
contaminate the pump after dismantling and before
carrying out any other work! There is danger to life!
Observe the specifications in the work regulations!
The operator must make sure that the personnel has
received and read the work regulations!
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work
can lead to death due to electric shock! Electrical
work must be carried out by a qualified electrician in
accordance with the locally applicable regulations.
DANGER
Potentially fatal danger due to dangerous
autonomous work!
Work in chambers and narrow rooms as well as work
involving risk of falling are dangerous work. Such
work may not be carried out autonomously! A
second person must be present for safety reasons.
WARNING
Risk of burns from hot surfaces!
Motor housing can become hot during operation. It
may cause burns. Allow the pump to cool down at
ambient temperature after switching it off!
NOTICE
Only use lifting equipment in a technically
sound condition!
Only use lifting equipment in a technically sound
condition for lifting, lowering and transporting the
pump. Ensure that the pump does not become
jammed during lifting and lowering. Do not exceed
the max. permissible bearing capacity of the lifting
equipment!
8.4.1 Stationary wet well installation
‡ Pump is decommissioned.
‡ Gate valves on the inlet and pressure side closed.
1. Disconnect the pump from the mains.
2. Attach the lifting equipment to the attachment point.
CAUTION!Never pull on the power supply cable! This
damages the power supply cable!
3. Slowly raise the pump and lift above the guide pipes
from the operating space. CAUTION!The power sup-
ply cable can be damaged while lifting! Hold the
power supply cable slightly taut when lifting!
4. Clean pump thoroughly (see point “Cleaning and disin-
fecting”). DANGER!Disinfect the pump when used in
fluids hazardous to health!
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