Grundfos Vaccuperm VGA-117, Инструкция по установке и эксплуатации

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6.6 Stopping the chlorine gas dosing system
Do not stop the chlorine gas dosing system by closing the
rate valve.
The rate valve is an adjusting valve, not a shut-off valve.
6.6.1 Stopping the chlorine gas dosing system in case of
emergency
WARNING
Toxic material
Death or serious personal injury
‐
If gas escapes, immediately leave the room.
‐
Put on personal protective equipment.
‐
Start countermeasures according to local safety regu-
lations.
1. Immediately close the chlorine container valves.
2. Let the system run until all parts are evacuated.
3. Stop the chlorine gas dosing system.
6.6.2 Stopping the chlorine gas dosing system for a short time
1. Close the rate valve at the dosing regulator using the adjusting
knob.
2. Stop the booster pump.
3. Close the motive-water valves.
4. Close the shut-off valve at the injection unit.
6.6.3 Shutting down the chlorine gas dosing system for a long
time
1. Close all chlorine container valves.
2. Let the system run, until the flowmeter of the dosing regulator
shows no flow.
3. Close the rate valve at the dosing regulator using the adjusting
knob.
4. Switch off the booster pump.
5. Close the motive-water valves.
6. Close the shut-off valve at the injection unit.
7. Fault finding
7.1 Maximum dosing flow is not reached
Cause Remedy
Insufficient injector vacuum.
The injector used is not
suitable.
Motive water pressure is too
low.
Backpressure is too high.
The dirt trap before the injector
is soiled. • The injector vacuum for
versions
with differential-
pressure regulator must be at
least 2 mH2O.
• The injector vacuum for
versions
without differential-
pressure regulator must be at
least 5 mH2O.
• Make sure that a suitable
injector type is used.
• Check if the injector functions
properly. Observe the manual
of the injector.
• Make sure that the motive
water pressure is sufficient.
• Make sure that the
backpressure is suitable. See
specification.
• Check the dirt trap before the
injector. Clean it, if necessary.
Leakage in the vacuum line
between dosing regulator and
injector. • Eliminate the leakage.
The vacuum line between
dosing regulator and injector is
too long or the diameter is too
small. • For details on vacuum lines,
see section Selection of
vacuum lines.
Soiled vacuum line. • Replace the vacuum line.
Servomotor does not reach
maximum dosing capacity. • Readjust the servomotor
and/or the external
controller. Observe the
manual of the servomotor.
Soiled filter at the pressure
connection of the vacuum
regulator. • Clean or replace the filter.
Closed chlorine container
valve. • Open the chlorine container
valve.
Empty chlorine container. • Replace the empty chlorine
container by a full one.
Related information
4.1.2 Selection of vacuum lines
7.2 Ball in the measuring glass of the flowmeter is
caught
Cause Remedy
Soiled measuring glass or ball. • Clean the measuring glass
and the ball.
Related information
8.2 Cleaning the measuring glass of the flowmeter
7.3 Water is in the measuring glass of the flowmeter
Cause Remedy
The diaphragm non-return
valve of the injector is
defective. 1. Repair the injector. Observe
the manual of the injector.
2. Disassemble the dosing
regulator, clean it and dry it
well.
3. Dry the vacuum line to the
injector, or replace it.
12
English (GB)