Pressure-type Chlorine Changeover Unit C 7520
BW 2 24 04 / 3
Lutz-JescoGmbH
Improvedchangesarealwaysreservedwithoutnotice.
4. Operation
As the chlorine supply battery empties, the
decreasing pressure causes the contact of the
pressuregaugeto make(withexistingliquidchlorine
phasethecontainer pressure amountsto6.8bar at
20°C and to 4.5 bar at 5°C - if the liquid phase is
used up, the container pressure drops rapidly on
further withdrawal). The corresponding LED at the
control unit changes from green to red. The
changeoverisinitiatedbytheservomotors. Whenit
iscomplete,thegreenLEDlightsupfortheoperation
of the now active chlorine supply battery. The LED
for the status of the motor valve shows green for
open,yellow duringthechangeoverprocessand red
forclosed.
Afterreplacingthe empty chlorine containersbyfull
ones, the RESET button for the corresponding
chlorinebatterymust be pressed atthecontrolunit.
The corresponding LED changes back from red to
green and indicates that this battery is again ready
for operation when required.
Manual changeover to the desired cylinder battery
is possible by pressing the corresponding key (left
or right cylinder).
Important!
Automatic changeover can only be made if the
cylinderRESETbutton is pressed after exchanging
the cylinders. If both Ready indicators are red, the
changeover unit will remain on the side connected
last until a RESET button is pressed.
Adjustment of the switch contact
The switch contact of the pressure gauge is set to
approx. 4 bar by the manufacturer. The switching
point may have to be brought into line in the plant.
The front panel of the pressure gauge must be
unscrewedforthispurpose.The switching point can
thenbeadjustedbymovingtheredmarkbetween1
and6bar.
Manual changeover (emergency operation)
The changeover valve can be operated by hand if
necessary(e.g.power failure). For thispurpose the
switch lever for manual / automatic operation at
the drive is shifted to manual. Now automatic
changeover is not possible. In any case please
switch back to automatic operation afterwards.
Slightly turn the lever until it locks.
Chlorine gas alarm
In the case of an chlorine gas alarm (only with an
alarm contact connected) both motor valves are
closedto preventfurtherchlorinegasfrom escaping.
All LEDs are flashing red. For resetting press the
RESET button. Depending on which button is
operated the changeover unit switches to the
correspondingchlorinecontainer.
5. Shutdown
Chlorinegasis hygroscopic and formshydrochloric
acid when exposed to atmospheric humidity.
Hydrochloric acid has a destructive effect on the
meteringequipment. Forthisreason,allconnections
must be sealed carefully when shutting down the
chlorination plant. All piping and valves should be
flushedwith dryair or nitrogen.
It is advisable to store the devices in a heated, dry
room if the system is to be shut down for extended
periods of time. The lines have to be tightly sealed
forthereasonsstatedabove before dismantling the
devices. When recommissioning the system,
attention must be paid in particular to any
condensation in the lines.
If necessary, this water must be expelled with dry
airor nitrogen.
6. Maintenance
ThetypeC7520 chlorine changeover unitisalmost
maintenance-free. During the annual maintenance
work,onlyavisualandfunctionaltestmustbecarried
out.Thesealsat the compression glands andinthe
ball valves must be replaced or regreased, if
necessary.
Important!
Seals may only be greased slightly with silicone
grease! Vaseline hardens in contact with chlorine
gas and will cause the ball valve to become stiff.
Particles may also be entrained by the flow of
chlorine gas and impair the correct functioning of
other valves in the system.
