Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 41

Further details regarding the individual steps
1. Drain the DHW cylinder. For this,
close the on-site shut-off valve and
open drain valve B.
2. Remove thermal insulation hood
B.
3. Pull cable C from anode connec-
tion D.
4. Remove flange lid E.
5. Remove loose deposits with a high
pressure cleaner.
!
Please note
When cleaning the inside,
only use plastic cleaning
utensils.
Commissioning, inspection, maintenance
(cont.)
6. Use a chemical cleaning agent to
remove hard deposits that cannot
be removed by a high pressure
cleaner.
!
Please note
To prevent material losses,
only use plastic tools to
clean the interior; never use
cleaning agents containing
hydrochloric acid.
7. Thoroughly flush the DHW cylinder
after cleaning.
8. Close drain valve A.
41