Pressure-type Chlorine Changeover Unit C 7520
BW 2 24 04 / 3
Lutz-Jesco GmbH
Improved changes are always reserved without notice.
4. Operation
As the chlorine supply battery empties, the
decreasing pressure causes the contact of the
pressure gauge to make (with existing liquid chlorine
phase the container pressure amounts to 6.8 bar 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
changeover is initiated by the servomotors. When it
is complete, the green LED lights up for the operation
of the now active chlorine supply battery. The LED
for the status of the motor valve shows green for
open, yellow during the changeover process and red
for closed.
After replacing the empty chlorine containers by full
ones, the RESET button for the corresponding
chlorine battery must be pressed at the control unit.
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
cylinder RESET button 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
unscrewed for this purpose. The switching point can
then be adjusted by moving the red mark between 1
and 6 bar.
Manual changeover (emergency operation)
The changeover valve can be operated by hand if
necessary (e.g. power failure). For this purpose 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
closed to prevent further chlorine gas from escaping.
All LEDs are flashing red. For resetting press the
RESET button. Depending on which button is
operated the changeover unit switches to the
corresponding chlorine container.
5. Shutdown
Chlorine gas is hygroscopic and forms hydrochloric
acid when exposed to atmospheric humidity.
Hydrochloric acid has a destructive effect on the
metering equipment. For this reason, all connections
must be sealed carefully when shutting down the
chlorination plant. All piping and valves should be
flushed with dry air 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
for the reasons stated above 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
air or nitrogen.
6. Maintenance
The type C 7520 chlorine changeover unit is almost
maintenance-free. During the annual maintenance
work, only a visual and functional test must be carried
out. The seals at the compression glands and in the
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.
