4
ENGLISH
APPLICATION
WARNING!
The pump must only be connected to sockets that have been
installed properly in accordance with the regulations and are
protected with at least 10 A (slow) and RCD-safety switches
(30mA).
DANGER!
The pump must never be used when a person is in the water.
Submersible pumps from the U3 and U3 spezial series are suit
-
able for pumping domestic waste water without stones. This
includes also water from household dishwashers and house-
hold washing machines.
The U3 spezial can also pump aqueous solutions with up to 15%
salt content and condensate from gas condensing boilers.
NOTICE!
In outdoor applications, only pumps with at least a
10-metre mains cable must be used.
When using the pumps, the relevant national laws, regulations
and stipulations must be adhered to, for example:
•
Domestic contaminated and waste water
(e.g. EN 12056 in Europe)
•
Installation of low voltage systems
(e.g., VDE 0100 in Germany)
For non-standard utilization conditions, further regulations
must be observed (e.g. VDE 0100 in Germany, part 701: ba-
throoms and shower rooms; part 702: swimming pools and
fountains and part 737: outdoor use).
Temperatures
The pumped medium must have a temperature of max 35 °C.
For a short time 60 °C are permissible (S2: 10 min, S3: 30%).
The submersible pump is frost-resistant down to -20 °C when
stored in dry conditions. When installed, however, it must not
be allowed to freeze in the water.
Transport
The pump must always be lifted by the handle and never by
the power supply cable! The pump should only be lowered into
deeper chambers or pits using a rope or chain.
ELECTRICAL CONNECTION
NOTICE!
Only qualified electricians may carry out electrical
works to the pump or the controls.
WARNING!
Before carrying out any works: disconnect the pump and the
controls from the mains and take steps to ensure that no one
else can reconnect them to the power supply.
The relevant standards (such as EN standards), country-spe-
cific regulations (such as VDE in Germany), and the regulations
of the local power supply companies must be observed.
NOTICE!
Never put the mains plug or a free lead end in water!
If water gets into the plug, this can cause malfunctions and da-
mage.
Observe the operating voltage (see the type plate)!
The pump is provided with a winding thermostat. In case of
unacceptably high temperatures it switches off the pump to
protect it against possible damage. Unacceptably high tem-
peratures may result e.g. from dry running or mechanical or
electrical overload.
CAUTION!
The pump is switched on again automatically after cooling
down - risk of injury!
For this reason, always disconnect the device from the mains
before remedying the fault! In order to do this, unplug from the
mains supply or remove the pre-fuses of the pump controls!
INSTALLATION
The pump must be installed as shown in the examples. For in-
stallations in accordance with EN 12056-4, the pressure pipe
must be laid in a loop above the local backflow level and pro
-
tected with a backflow prevention valve in accordance with EN
12050-4.
A correspondingly larger diameter pipe should be used for
longer pressure pipelines to avoid pipe friction losses.
With any pump that has no automatic switching, the switch-on
and switch-off heights can be set variably with a separate level
control.
Our ready to connect level controls can be installed
without specific electrotechnical skills.
The pump housing is automatically vented via the enclosed
90° elbow. If this is not desired, the ventilation opening can be
closed, e.g. for mobile operation.
Flushing device
The pump can keep the intake section at the bottom of the
chamber clear of deposits to a large extent if you carry out a
small modification
: Lever off the foot strainer with a screwdriver,
unscrew the three red caps and snap the foot strainer back on.
This reduces the performance of the pump only insignificantly.
Low level pumping
Flooded surfaces can be drained down to a residual water level
of a few mm without using any special accessories. To do so,
the foot strainer must be levered off with a screwdriver. In the
case of pumps with an attached control, the float switch must
be locked in the ON position. It is not possible therefore in low
level pumping to operate the pump in switching mode.
