Viessmann Vitocell 100-B Service Instructions Manual page 10

Commissioning, inspection, maintenance
Cleaning the inside of the DHW cylinder
A
B
1x
D
Fig. 4
10
7x
E
(cont.)
1. Drain the DHW cylinder on the DHW side.
!
Please note
Material losses may result from draining with
a vacuum pump when the air vent valve is
closed.
Open the air vent valve during draining.
2. Remove cover , flange insulation
A
cover .
E
3. Disconnect the DHW cylinder from the pipework to
prevent cleaning agents and contaminants from
entering the pipework.
4. Remove loose deposits with a pressure cleaner.
!
Please note
Pointed or sharp cleaning tools will damage
the cylinder interior.
Only use plastic tools to clean the inside.
5. Use a chemical cleaning agent to remove hard
deposits that cannot be removed with a pressure
cleaner.
!
Please note
Cleaning agents containing hydrochloric acid
will attack the DHW cylinder material.
Never use such cleaning agents.
Danger
Cleaning agent residues can cause poison-
ing.
Always observe the information provided by
the cleaning agent manufacturer.
6. Fully drain all cleaning agent.
7. Flush the DHW cylinder thoroughly after cleaning.
and flange
B