Decommissioning/removal en-US
Installation and operating instructions Wilo-Rexa UNI 21
8 Decommissioning/removal
8.1 Personnel qualifications
▪Operation/control: Operating personnel must be
trained in the operating principle of the complete sys-
tem.
▪Electrical work: A qualified electrician (in accordance
with EN50110-1) must carry out the electrical work.
▪Installation-/dismantling work: The technician must be
trained to handle the necessary tools and required fas-
tening materials for the present building site.
8.2 Operator’s obligations
▪Locally applicable accident prevention and trade asso-
ciation safety provisions.
▪Observe all regulations for working with and under-
neath heavy suspended loads.
▪Make available the required protective equipment and
ensure that the personnel wear the protective equip-
ment.
▪Ensure sufficient aeration in closed rooms.
▪If toxic or suffocating gases build up, immediately initi-
ate countermeasures!
8.3 Decommissioning
During decommissioning the pump is switched off, but
continues to remain installed. This ensures that the
pump is always ready for operation.
‡ In order that the pump is protected from frost and ice,
always completely immerse the pump in the fluid.
‡ The 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 unauthorized
switch-on (e.g. seal off the main switch).
▶ The pump is out of service and can now be disassem-
bled.
If the pump remains installed after decommissioning,
observe the following points:
▪Ensure requirements for decommissioning for the com-
plete time period of decommissioning. If the require-
ments are not guaranteed, remove the pump following
decommissioning!
▪In the case of an extended time period of decommis-
sioning, carry out a 5minute test run (monthly to quar-
terly) at regular intervals. CAUTION!Test runs must
only take place under the applicable operating condi-
tions. Never run the machine dry! This can result in
total breakdown!
8.4 Removal
DANGER
Danger due to fluids which are dangerous to
health!
When the pump is used in fluids which are danger-
ous to health, decontaminate the pump after re-
moval and before all work! There is a risk of fatal in-
jury! Observe information from the work regula-
tions! The operator must ensure that the personnel
have received and read the work regulations!
DANGER
Electrocution hazard!
Improper conduct when carrying out electrical work
causes death due to electric shock! Electrical work
must be carried out by a qualified electrician in ac-
cordance with the local regulations.
DANGER
Danger to life due to dangerous lone work-
ing!
Working in pump chambers and tight spaces as well
as working where there is a danger of falling is dan-
gerous work. This work must not be carried out
alone! A second person must be present for safety
reasons.
WARNING
Danger of burning due to hot surfaces!
The motor housing can get hot during operation. It
can lead to burns. Allow the pump to cool down to
ambient temperature after switching off!
NOTICE
Use only technically flawless lifting equip-
ment!
For lifting, lowering and transporting the pump, use
only technically flawless lifting equipment. Make
sure that the pump does not jam during lifting and
lowering. Do not exceed the maximum permissible
bearing capacity of the lifting equipment!
8.4.1 Stationary wet well installation
‡ Pump decommissioned.
‡ Gate valve on inlet and pressure side closed.
1. Disconnect pump from power supply.
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