Operation; Switching On The Chlorine Gas Dosing System; Setting The Dosing Flow; Reading The Dosing Flow - Grundfos Vaccuperm VGB-103 Montage- Und Betriebsanleitung

7. Operation

The chlorine gas dosing flow is set at the adjustment knob of the
compact dosing unit, see section

7.1 Switching on the chlorine gas dosing system

1. Close the adjustment knob (2).
2. Open the shut-off valve at the injection unit.
3. Open the motive water valves.
4. Open the motive water supply of the injector.
5. Open the chlorine container valve.
6. Slowly open the adjustment knob (1), until the ball in the
measuring glass indicates the desired gas flow.

7.2 Setting the dosing flow

To increase the dosing flow, turn the adjustment knob very slowly
counter-clockwise.
If the maximum dosing flow is reached, don't turn the
Caution
adjustment knob any further, because there is no
locking.
To reduce the dosing flow, turn the adjustment knob very slowly
clockwise.
1
Fig. 16 Setting the dosing flow
Pos. Description
Turning the adjustment knob counter-clockwise will
1
increase the dosing flow.
Turning the adjustment knob clockwise will reduce the
2
dosing flow.

7.3 Reading the dosing flow

The dosing flow is read at the top of the ball in the measuring
glass.
lbs/day
Fig. 17 Reading the dosing flow
The scale of the measuring glass is adjusted to a gas
temperature of 20 °C.
Note
In case of extremely different temperatures the
dosing flow may differ from the value being shown.
4.1 Description of the device.
2
g/h
7.4 Changing the chlorine container while the system
is running
The red mark (empty indication) at the vacuum regulator shows
that the minimum pressure of the chlorine container is reached.
The container must be exchanged.
Warning
Put on the required protective equipment.
1. Close the chlorine container valve.
2. Let the system run until the measuring glass shows no more
gas flow.
3. Close the adjustment knob (2).
4. Turn off the motive water supply.
5. Close the motive water valves.
6. Close the shut-off valves before and after the injector.
7. Unscrew the compact dosing unit from the connection of the
container.
– Place the unit into the wall support, if existing.
8. Screw the protective cap onto the empty chlorine container;
put the empty container away, and protect it from rolling away
or turning over.
9. Position the new chlorine container, and fix it correctly.
10. Remove the protective cap from the new chlorine container.
– All connections must be absolutely clean and dry.
Warning
Replace the gaskets at any change of chlorine
container.
Never use the compact dosing unit without filter!
11. Insert the gasket at the pressure connection of the compact
dosing unit.
– Exchange the filter, if necessary.
12. Screw the compact dosing unit onto the chlorine container.
Do not align the unit by turning the housing!
Caution
If necessary, hold up with a 13-mm fork wrench.
Warning
Check the tightness before re-starting the system.
13. Check the tightness as described in section
tightness.
14. Re-start the system.
6.1 Checking the
17