Viessmann Vitodens 333 Service Instructions Manual page 24

Initial start-up, inspection, maintenance
Further details regarding the individual steps
Cleaning the DHW cylinder
Note
DIN 1988 requires a visual inspection and (if necessary) cleaning evey two
years after the cylinder has been taken into use and thereafter according to
requirements.
24
(cont.)
1. Remove cover A.
2. Pull earth cable B from connecting
tab C.
3. Connect the tester (up to 5 mA) in
series between connecting tab C
and earth cable B.
&
The anode is OK if the indicated
current is > 0.3 mA.
&
Visually inspect the anode, if the
current measures < 0.3 mA or if
there is no current at all (see
page 25).
1. Drain the DHW cylinder.
2. Remove flange lid A.
3. Disconnect the DHW cylinder from
the pipework to prevent cleaning
agents and contaminants entering
the pipe system.
4. Remove loose deposits with a high
pressure cleaner.
!
Important information
For cleaning the inside, only
use plastic cleaning utensils.