Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 119

Further details regarding the individual steps
Vitocal 242
Vitocal 222
1. Drain the DHW cylinder from the
DHW side. For this, close shut-off
valve A (only for the Vitocal 242
internal) and open drain valve B.
!
Please note
Underpressure in the DHW
cylinder can lead to mate-
rial damage.
The air vent valve must
always be open when the
DHW cylinder is being
drained with a vacuum
pump.
2. Remove thermal insulation cover
C.
3. Pull anode protection connector
D from push-on tab E.
4. Remove flange lid F.
Commissioning, inspection, maintenance
(cont.)
5. Remove loose deposits with a
high pressure cleaner.
!
Please note
Pointed or sharp-edged
objects can damage the
DHW cylinder.
Only use plastic cleaning
equipment to clean the
inside.
Note
Manually remove coarse dirt parti-
cles that cannot be flushed out
through the air vent valve.
119