Viessmann EVB, Service Instructions For Contractors, Page: 8 / 44

8
F
H
H
A
G
E
B
C
C
D
Fig.1
1. Drain the DHW cylinder from the DHW side.
2. Remove top panel
A
, hood
B
, thermal insulation
mats
C
and thermometer sensor
D
.
3. Remove flange cover
E
and cylinder cap
F
with
stainless steel circular blank G and gaskets H .
4. To prevent cleaning agents and contaminants
entering the pipework, separate the DHW cylinder
from the pipework.
5. Remove loose deposits with a high pressure
cleaner.
!
Please note
Pointed or sharp cleaning tools will damage
the cylinder interior.
Only use plastic tools to clean the inside.
6. Use a chemical cleaning agent to remove hard
deposits that cannot be removed with a high pres-
sure cleaner.
!
Please note
Cleaning agents containing hydrochloric acid
attack the DHW cylinder material.
Never use such cleaning agents.
Danger
Cleaning agent residues can result in poi-
soning .
Always observe the information provided by
the cleaning agent manufacturer.
7. Fully drain all cleaning agent.
8. Flush the DHW cylinder thoroughly after cleaning.
Commissioning, inspection, maintenance
Cleaning the inside of the DHW cylinder
5677 372 GB