Temporary Decommissioning; Decommissioning For Maintenance Work Or Storage - Wilo Sub TWU 3 HS Serie Notice De Montage Et De Mise En Service

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• 3 X2 = Pmax2
Makes it possible to enter a second value for the
maximum pressure: "Pmax2". If, for example,
higher pressure is required at the taps for con-
sumers that are only used occasionally, this pres-
sure can be accessed via a switch. If the switch
is open, the "Pmax" value is used. If the switch is
closed, the "Pmax2" value is used.
6.6.1 Installing the auxiliary contact
Fig. 9: Installation
1 Position of the auxiliary contact
2 Threaded cable connection
The threaded cable connections for the auxiliary
contact are seal as standard. To lead in a cable,
you have to unscrew the cap and drill through or
pierce the seal on the cap's head.
WARNING: Danger of injury to hands!
If the cap is not securely fixed during drilling
or piercing, there is an increased risk of injury!
Fasten the cap so that it is securely held dur-
ing the work and cannot slip. For your own
safety, wear protective gloves!
Fig. 10: Overview of connections
Connection for dual
1
pump operation
Connection for remote
2
operation
To use the unit as a single-pump system, the
auxiliary contact must be set to the
value "1 <->" and a cable may not be connected
to the auxiliary contact!
BEWARE of short-circuits!
An incorrect connection at the auxiliary con-
tact could cause a short-circuit. This can lead
to destruction of the frequency converter.
Connect devices to the auxiliary contact ex-
actly as shown in the wiring diagram!
7 Shutdown/disposal
All work must be carried out with the greatest
care.
Proper protective clothing is to be worn.
When carrying out work in wells and/or tanks,
the respective local protection measures must be
observed in all cases. A second person must be
present for safety reasons.
46
Connection for switch
3
for Pmax2
Only auxiliary lifting devices that are in a techni-
cally perfect condition and lifting gear that has
been officially approved may be used for lowering
and raising the pump.
RISK of death due to malfunction!
Lifting gear and lifting devices must be in a
perfect technical condition. Work may only
commence if the lifting device has been
checked and found to be in perfect working
order. If it is not inspected, fatal injuries may
result!

7.1 Temporary decommissioning

For this type of shutdown, the pump remains
installed and is not cut off from the electricity
supply. In the event of temporary decommission-
ing the pump must remain completely immersed
so that it is protected from frost and ice. Ensure
that the temperature in the operating space and
of the fluid does not fall below +3 °C.
The ambient temperature at the installation
site of the frequency converter must always be
between 4 and 40 °C!
This ensures that the pump is always ready for
operation. For extended downtime, a regular
(monthly to quarterly) 5-minute function test
should be carried out.
CAUTION!
Only perform function runs under the proper
operating and usage conditions. Never run the
machine dry! Violating this can lead to total
damage!
7.2 Decommissioning for maintenance work or
storage
• Switch off the system and secure it against being
switched on again by unauthorised persons.
• Have a qualified electrician disconnect the pump
from the mains.
• Close the slide valves in the discharge pipeline
downstream of the well cover.
You can then begin disassembly.
DANGER due to toxic substances!
Pumps that pump liquids hazardous to health
must always be decontaminated before un-
dertaking any other work! Otherwise there is
a risk of death! Wear the necessary physical
protection equipment!
BEWARE of burns!
The housing parts can heat up to well above
40 °C. There is a risk of burns! After switch-
ing it off, let the pump cool down to ambient
temperature.
SHUTDOWN/DISPOSAL
WILO SE 05-2019 DIN A4