Cleaning The Dhw Cylinder; Checking And Replacing The Magnesium Anode (If Required) - Viessmann VITODENS 333-F WS3A Service Instructions Manual

Further details regarding the individual steps

Cleaning the DHW cylinder

Note
DIN 1988 requires a visual inspection and (if required) cleaning at latest two
years after the cylinder has been taken into use and thereafter according to
requirements.
1. Drain the DHW cylinder.
2. Remove flange lid A.
3. Disconnect the DHW cylinder from
the pipe system to prevent contam-
ination from entering the pipe sys-
tem.

Checking and replacing the magnesium anode (if required)

Check the magnesium anode. If it is discovered that the anode has degraded to
10 to 15 mm Ø, we recommend replacing the magnesium anode.
Commissioning, inspection, maintenance
(cont.)
4. Remove loose deposits with a high
pressure cleaner.
!
Please note
When cleaning the inside,
only use plastic cleaning
utensils.
5. Use a chemical cleaning agent to
remove hard deposits that cannot
be removed by a high pressure
cleaner.
!
Please note
Never use hydrochloric acid
based cleaning agents.
6. Thoroughly flush the DHW cylinder
after cleaning.
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