English (GB)
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9.4.5 Dismantling and reassembling level switch (4.04)
A defective level switch can be dismantled and reassembled as
follows.
Fig. 79
NaClO solution line level switch
1. Switch off the power supply of the Selcoperm electrolyser
control cabinet and make sure that it cannot be accidentally
switched on.
2. Disconnect the electrical plug connection.
3. Unscrew union nut (3).
4. Remove level switch (4) together with sleeve (6), lock nut (5)
and tension sleeve (8) from support (7).
5. Unscrew lock nut (5).
6. Remove level switch (4) from sleeve (6).
Reassembling
7. Screw in level switch (4) into sleeve (6) by hand until the
switch rests on the bottom of the sleeve.
8. Screw on lock nut (5) and tighten it by hand.
9. Insert level switch (4) together with sleeve (6), lock nut (5) and
tension sleeve (8) into support (7).
10. Screw in union nut (3) and tighten it by hand.
11. Connect the electrical plug connection.
12. Check proper functioning. See section
adjusting NaClO level switch (4.04)
.
9.5 Acid cleaning
This task must be performed by certified service persons.
The acid cleaning of the electrodes is performed via a
semi-automatic process controlled by the Selcoperm electrolyser.
The Grundfos acid cleaning station is prepared for electrical
connection to the Selcoperm electrolyser control cabinet. The
special socket is on the left bottom of the Selcoperm electrolyser
control cabinet. A cable with a special plug is pre-assembled on
the dosing pump of the acid cleaning station.
9.5.1 Interval for acid cleaning
The acid cleaning process should only be performed, if significant
scale has built up on the electrodes in the electrolysis cells. How
fast scale builds up on the electrodes depends on the quality of
the softened water and the salt.
Scaled electrodes lead to an increased DC voltage of the
electrolysis cells. If the DC voltage has increased, check the
water and salt quality and consider to perform an acid cleaning.
An improper working water softener can also cause the need for
an acid cleaning.
9.5.2 Performing the acid cleaning
This task must be performed by certified service persons.
TM
06 468
7 231
6
Pos.
Description
3
Union nut
4
Level switch
5
Lock nut
6
Sleeve
7
Support
8
Tension sleeve
3
5
4
6
7
8
A safe process control is only guaranteed, if the
original Grundfos acid cleaning station with special
plug connection to the Selcoperm electrolyser is
used.
WARNING
Chemical hazard
Death or serious personal injury
If acid is mixed with sodium hypochlorite solution,
highly hazardous chlorine gas is released.
- Keep acid away from the sodium hypochlorite
solution and the degassing and storage tank.
- Wear the stipulated personal protective equipment
(protective clothing, goggles, respirator etc.).
- Observe the chemical manufacturer's safety data
sheets (MSDS) and safety instructions of the used
chemicals.
- Only use the original Grundfos acid cleaning
station and always perform the acid cleaning
procedure completely.
