Jung Pumpen MultiStream UAK 55/2 B2/2 Instructions De Service page 5

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
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.
English
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.
When using a chain to lift the pump,
please observe the relevant national
regulations regarding accident pre-
vention. Lifting gear must be checked regularly
by an expert in accordance with the legal regu-
lations.
Motors in the UFK range conform to
the "flameproof enclosures" ignition
protection category. Maintenance
works that affect the explosion protection may
only be carried out by authorised specialists or
by the manufacturer. When carrying out re-
pairs, all areas next to flameproof gaps must be
checked for damages and, if necessary, re-
placed by genuine parts.
Oil check
The drain plug is labelled "Öl". In order to check
the mechanical seal, the oil, including any resi-
due, must be drained from the oil reservoir and
collected in a clean measuring container.
• If the oil is contaminated with water (milky),
an oil change must be carried out. Check
again after a further 300 operating hours,
but at the very latest after 6 months!
• However, if the oil is contaminated with
both water and pollutants, then not only
the oil must be replaced, but the mechani-
cal seal as well.
For monitoring the oil reservoir, it is also pos-
sible to retrofit the electrode of our "DKG" or
DKG-Ex" seal leak control device in place of the
"DKG" sealing screw.
Changing the oil
To ensure operational liability, the first oil
change should be carried out after 300 operat-
ing hours, with further oil changes carried out
after every 1000 operating hours.
If the number of operating hours is very low,
an oil change should still be carried out at least
once a year.
If wastewater with strongly abrasive constitu-
ents is being pumped, the oil changes should
be carried out at correspondingly shorter inter-
vals.
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