Commissioning
Adjusting the switch point
17
© Lutz-Jesco GmbH 2018
Subject to technical changes
180321
BA-24721-02-V02
Chlorine gas changeover unit
C 7523
Operating instructions
8 Commissioning
8.1 Checking the vacuum system
NOTE
Operating faults through leakages in the vacuum system
Small leaks in the vacuum system will not be recognised in normal
operation, since no chlorine escapes. Air will enter the system with
moisture. The moisture can combine with the chlorine to create depos-
its and operating malfunctions.
With the injector switched off, there may be a slight chlorine smell.
ð
Check the vacuum system.
ð
Ensure that all action is taken only by personnel with sufficient and
corresponding qualifications.
Precondition for action:
ü
The vacuum system is fully assembled.
ü
All the open connections of the vacuum system were closed.
ü
The injector is ready for operation.
Perform the following working steps:
1.
Interrupt the voltage supply of the changeover unit.
i
The position of the ball valve is adjusted manually during the
check. Error messages are generated if the voltage supply is
activated.
2.
Switch the selection lever on the motor of the changeover unit to
MAN (= manual operation)
3.
Turn the grip on the motor in such a way that the left supply battery is
connected.
4.
Interrupt the chlorine supply from the connected supply battery. To
do so, either connect the tank valve of a valve in the supply line to the
vacuum regulator.
5.
Open the valve on the dosing device to adjust the dosing quantity.
6.
Switch on the injector and wait until the vacuum pressure gauge dis-
plays at least -0.5 bar.
i
A number of dosing devices contain a valve which protects the
injector against too strong a vacuum. If this valve is set e.g. to
0.4 underpressure, a negative pressure of 0.5 bar cannot be
reached during the leak test.
7.
Switch off the injector.
4
The vacuum must stay unchanged for at least five minutes.
8.
If the vacuum collapses quickly, eliminate the leak and repeat the
check on the vacuum system.
9.
Turn the grip on the motor in such a way that the right supply battery
is connected. Repeat steps 4-8.
ü
Vacuum system checked.
NOTE
Damage of the gauge
The search for leaks in the vacuum system often uses compressed air
or nitrogen with a slight positive pressure as the leak point can then be
recognised using a soapy solution. This test damages the contact
gauge.
ð
Dismantle the contact gauge before checking the vacuum system
with positive pressure.
8.2 Turning on the device
Precondition for action:
ü
The device is fully assembled.
ü
The leak test was performed.
Perform the following working steps:
1.
Switch on the voltage supply.
2.
Ensure that the selection lever on the motor is set to AUTO.
è
The motor moves automatically to the operating position last set.
ü
Device switched on.
8.3 Adjusting the switch point
It is rare that the switch point of the contact gauge needs to be adjusted.
Possible reasons for this could include:
n
Very weak performance of the injector.
n
Dosing device with restrictor valve for the vacuum.
Fig. 15: Adjusting the switch point
Perform the following working steps:
1.
Remove the transparent cover (2) from the contact vacuum gauge. To
do so, unscrew the outside ring (1) from the device. Observe the
seal (3).
2.
Move the red marking (4) on the desired switch point.
3.
Refit the transparent lid and tighten the ring nut by hand. Ensure the
correct position of the seal.
ü
Switch point of the contact gauge adjusted.
4
3
2
1
