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the pump can also be put into operation
using a suitable plug.
Level monitoring can be carried out
using various systems. Their specific
characteristics and requirements can
be found in the relevant operating man-
uals.
In accordance with the explo-
sion protection laws and regu-
lations,
JUNG
should never be allowed to run dry or to
operate in "snore" mode.
The pump must switch off when the wa-
ter 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 in-
spection purposes may only take place
outside 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 protect-
ed from frost! A chamber cover must be
selected that is suitable for the intended
use and has the required load-bearing
capacity.
If necessary, the pump housing can
be ventilated by unscrewing the "Luft"
sealing screw. A flushing pipe, avail-
able as an accessory, can be installed to
minimise deposits and the formation of
floating layers in the chamber.
If the pump is malfunctioning, part of
the contents of the oil reservoir could
escape into the pumping medium.
Not EX-pumps. If a hose is used as a
pressure line, care must be taken to en-
sure that for every pumping operation
the hose is completely empty before the
pump is submersed. Any residual liquid
would obstruct the ventilation of the
pump housing and therefore also hin-
der 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 dur-
ing the daily test run.
In these cases, the pump housing must
be ventilated by unscrewing the "Luft"
sealing screw.
SERVICING
We recommend that you service the
equipment in accordance with EN
12056-4 and EN 60074-19.
To ensure continued reliability of ser-
vice, we recommend that you take out a
service contract.
Before carrying out any works:
disconnect the pump and the
controls from the mains and
EX-pumps
take steps to ensure that it cannot be
emergized again.
Check the cable for mechani-
cal or chemical damage. A
damaged or kinked cable must
be replaced.
When using a chain to lift the
pump, please observe the rel-
evant national regulations re-
garding accident prevention. Lifting
gear must be checked regularly by an
expert in accordance with the legal reg-
ulations.
Motors in the EX range con-
form to the "flameproof enclo-
sures" ignition protection cat-
egory. Maintenance works that affect
the explosion protection may only be
carried out by authorised specialists or
by the manufacturer. When carrying out
repairs, all areas next to flameproof
gaps must be checked for damages
and, if necessary, replaced by genuine
parts.
Oil check
The oil reservoir is sealed on the outside
with a sealing screw "Öl" (oil). In order
to check the mechanical seal, the oil,
including any residue, 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 car-
ried 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 mechanical seal as well.
For monitoring the oil reservoir, it is
also possible to retrofit the electrode of
our "DKG" or DKG-Ex" seal leak con-
trol device in place of the "DKG" sealing
screw.
ENGLISH
Changing the oil
To ensure operational liability, the first
oil change should be carried out after
300 operating 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
constituents is being pumped, the oil
changes should be carried out at cor-
respondingly shorter intervals.
Use HLP hydraulic mineral oil, viscosity
class 22 to 46, e.g. Mobil DTE 22, DTE
24, DTE 25, to replace the oil in the oil
reservoir.
The quantity of oil required is 1000 cm³,
except for CW2 pumps, which must be
filled with 1700 cm³.
ATTENTION! The oil reservoir may only
be filled with the specified quantity of
oil. Overfilling will result in the pump
being rendered inoperable.
Cleaning
To clean the open centrifugal impeller
and the volute casing, simply remove
the 4 hexagonal M 10 x 20 screws and
lift the motor unit off the ring housing.
Worn impellers can have sharp
edges.
ATTENTION! If the wrong screws are
unscrewed, the oil will run out of the oil
reservoir.
Tightening torque M
for A2 screw ma-
A
terials
for M 6 M
= 8 Nm
A
for M 8 M
= 20 Nm
A
for M 10 M
= 40 Nm
A
for M 12 M
= 70 Nm
A
for M 16 M
= 160 Nm
A
Checking the pump unit
The housing screws for the pump, and
the connecting and fixing screws of the
installation must be checked to ensure
they are fixed securely. They should be
tightened if necessary.
If the pump performance decreases, or
if increasingly loud noises can be heard
during operation, the open centrifugal
impeller must be checked for wear by
an expert and replaced if necessary.
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