Jung Pumpen MultiFree UAK 25/2 AW /3 Instructions De Service page 5

can be heard during operation. If the rotational
direction is wrong, 2 phases of the supply cable
must be swapped over.
The start-up jolt can be very forceful.
Coil thermostats
ATTENTION! In addition to the overload trip or
protective switch of the motor, the thermostats
integrated in the motor winding must also be
connected. The thermostats are suitable for
250 V / 1.2 A (cos phi = 0.6) and are labelled 30
and 32 for connection purposes.
Thermostat connection without explosion
protection (UAK)
The thermostats are to be connected in such a
way that the motor is switched off via the con-
trol circuit when the response temperature is
reached. The motor is switched on again auto-
matically after the winding has cooled down.
Thermostat connection with explosion
protection (UFK)
The thermostats are to be connected in such
a way that the motor is switched off via the
control circuit when the response temperature
is reached. It must not be possible for the mo-
tor to switch on again automatically after the
winding has cooled down.
After an automatic cut-out via the
temperature limiters, the cause of
the malfunction must first be elimi-
nated. Only then may the motor be switched
on again manually.
The restart interlock must be "non-resetting on
power failure", i.e. the lock must be in place to
prevent restarting even after a power cut (in
Europe: Directive 94/9/EC, Appendix II 1.5, EN
60079-17 Table1, B10).
Operation with frequency converter
Frequency converters may only be used for
controlling the frequency of special models of
three-phase pumps.
ATTENTION! For physical reasons, pumps may
not be operated at a higher frequency than
that shown on the type plate. If the frequency
increases beyond the value on the type plate,
the power input increases and the motor is
then overloaded.
For special models of three-phase pumps that
are designed for frequency converter opera-
tion, the motor type shown on the type plate
is labelled with an additional "K" (e.g. D90-2/75
CK). These pumps also have a sticker on the end
of the cable that indicates their suitability for
use with a frequency converter.
Explosion protected pumps (UFK)
These motors are fitted with PTC thermistors
as winding protectors. Voltages of more than
2.5 V may not be connected to the winding
protection terminals 40 and 41! For explosion
protected pumps, a type-tested tripping unit
that complies with the EC type-testing require-
ments is also necessary.
Installation
ATTENTION! Before the pump can be installed,
the 4 plastic packaging feet must be unscrewed
from the bottom of the pump housing and re-
moved.
The pump must be installed as shown in the
examples. For installations in accordance with
DIN EN 12056-4, the pressure pipe must be laid
in a loop above the local back pressure level
and protected with a back pressure prevention
valve.
Example installation with guide rail system
for pumping stations at a permanent location.
Assembly: Fix the coupling base firmly to the
floor of the collection chamber using plugs
and then mount the guide rails. Next, install
the pressure pipe including the necessary fit-
tings, such as the non-return valve and shut-off
valves.
Finally, fit the pump with the screwed-on cou-
pling catch on to the guide rails and lower it
into place using a chain fixed to the shackle.
A fixing facility for lifting gear should be provid-
ed above the chamber opening at a sufficient
height.
Example of installation with pump base or
retrofitting or mobile operation.
Assembly: The submersible pump is fitted
with a 90° connection and then lowered into
the chamber or collecting pit using a chain. For
English
short-term use, the pump can also be put into
operation using a suitable plug.
Level monitoring can be carried out using vari-
ous systems. Their specific characteristics and
requirements can be found in the relevant op-
erating manuals.
In accordance with the explosion
protection laws and regulations,
UFK-pumps should never be allowed
to run dry or to operate in "snore" mode.
The pump must switch off when the water level
sinks to the upper edge of the pump housing (x
in the illustration), at the very latest. This shut-
down must be implemented via a separate
switching circuit. Dry running for servicing or
inspection purposes may only take place out-
side the potentially explosive area.
A correspondingly larger diameter pipe should
be used for longer pressure pipelines to avoid
pipe friction losses.
Rising pressure pipes must be protected from
frost! A chamber cover must be selected that
is suitable for the intended use and has the re-
quired load-bearing capacity.
If necessary, the pump housing can be venti-
lated by unscrewing the "Luft" sealing screw. A
flushing pipe, available as an accessory, can be
installed to minimise deposits and the forma-
tion of floating layers in the chamber.
If the pump is malfunctioning, part of the con-
tents of the oil reservoir could escape into the
pumping medium.
Only applies to UAK pumps. If a hose is used
as a pressure line, care must be taken to ensure
that for every pumping operation the hose is
completely empty before the pump is sub-
mersed. Any residual liquid would obstruct the
ventilation of the pump housing and therefore
also hinder the pumping operation.
This situation can also occur if the pump runs
dry, pumps down to a lower lever than that
shown in the installation drawing, or runs in
"snore" mode during the daily test run.
In these cases, the pump housing must be ven-
tilated by unscrewing the "Luft" sealing screw.
Servicing
We recommend that you service the equip-
ment in accordance with EN 12056-4 and EN
60074-19.
To ensure continued reliability of service, we
recommend that you take out a service con-
tract.
Before carrying out any works: dis-
connect the pump and the controls
from the mains and take steps to en-
sure that it cannot be emergized again.
Check the cable for mechanical or
chemical damage. A damaged or
kinked cable must be replaced.
5 5