Switching On/Off; Conduct During Operation; Decommissioning/Disposal; Temporary Decommissioning - Wilo Rexa PRO Serie Instrucciones De Instalación Y Funcionamiento

DECOMMISSIONING/DISPOSAL

• Clean the piping on the suction side – flush with
clean water to prevent deposits causing clogging.
• Open all slide valves on the pressure and suction
sides
If the slide valves on the suction and pressure
sides are closed during operation, the fluid in the
hydraulics housing is heated up by the pumping
movement. This heating creates strong pressure
in the hydraulics housing. The pressure can result
in the pump exploding. Before switching on the
pump, ensure that all the slide valves are open and
open any closed slide valves.

6.5.2. Switching on/off

The pump is switched on and off using a separate
operating point (on/off switch, switchgear) provided
by the customer.
During the start-up procedure, the rated current is
temporarily exceeded. After the start-up procedure
is finished, the current must not exceed the rated
current again.
If the motor does not start up, it must be switched
off without delay. Before switching it on again,
wait for the specified start pause and make sure to
rectify the fault.

6.6. Conduct during operation

When operating the pump, always follow the
locally applicable laws and regulations for work
safety, accident prevention, and handling electrical
machinery. To help ensure safe working practice,
the responsibilities of employees should be clearly
specified by the operator. All personnel are respon-
sible for ensuring that regulations are observed.
Due to their design, centrifugal pumps have rotating
parts that are easily accessible. Depending on the
operating conditions, sharp edges can develop on
these parts.
WARNING: danger of crushing and amputation
of limbs!
Sharp edges can form on the rotating parts in
the hydraulics. These can result in crushing and
amputation of limbs. Never reach into the hy-
draulics when the machine is in operation.
The following must be checked at regular intervals:
• Operating voltage (permissible deviation +/-5%
of the rated voltage)
• Frequency (permissible deviation +/- 2% of the
rated frequency)
• Current consumption (permissible deviation be-
tween phases is a maximum of 5%)
• Voltage difference between the individual phases
(max. 1%)
• Switching frequency and switching pauses (see
technical data)
• Avoid air entry in the inlet; a deflector plate
should be fitted if necessary
• Minimum water submersion
Installation and operating instructions Wilo-Rexa PRO
• Switching points for level control or dry-running
protection
• Smooth running
• All slide valves must be open.
If the slide valves on the suction and pressure
sides are closed during operation, the fluid in the
hydraulics housing is heated up by the pumping
movement. This heating creates strong pressure
in the hydraulics housing. The pressure can result
in the pump exploding. Make sure that all slide
valves are open during operation.
7. Decommissioning/disposal
• All work must be carried out with the greatest care.
• Proper protective clothing is to be worn.
• When carrying out work in basins and/or tanks, the
applicable local protection measures must be ob-
served. A second person must be present for safety
reasons.
• Only lifting equipment that is in a technically per-
fect condition and load carrying equipment that has
been officially approved may be used for lowering
and raising the pump.
RISK of fatal injury due to malfunctions!
Load carrying and lifting equipment must be in
a perfect technical condition. Work may only
commence once the lifting equipment has been
checked and found to be in perfect working or-
der. If it is not checked, fatal injuries may result.

7.1. Temporary decommissioning

For this type of deactivation, the pump remains
installed and is not cut off from the electricity
supply. In the event of temporary decommissioning
the pump must remain completely immersed so that
it is protected from frost and ice. Ensure that the
temperature of the fluid and in the operating space
does not fall below +37 °F (+3 °C).
This ensures that the pump is always ready for oper-
ation. For extended downtime, a regular (monthly to
quarterly) 5 minute test run should be carried out.
CAUTION!
Only perform test runs under the proper operat-
ing and usage conditions. Never run the machine
dry! This can result in irreparable damage!
7.2. Decommissioning for maintenance work or stor-
age
The system must be switched off and the pump
must be disconnected from the power supply by
an electrician and secured against being switched
on again without permission. Pumps with plugs
must be unplugged (do not pull the cable!). Work
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