Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 89

Cleaning the DHW cylinder
1.
A B
8x
2.
Fig. 68
1. Remove the thermal insulation. Undo the screws.
Danger
The uncontrolled escape of DHW can cause
scalding and building damage.
Only open DHW and heating water connec-
tions with a depressurised DHW cylinder.
!
Please note
Negative pressure in the DHW cylinder can
cause material damage.
The air vent valve must always be open
when draining the DHW cylinder with a suc-
tion pump.
2. Remove the protective magnesium anode.
Replace the gasket.
Commissioning, inspection, maintenance
(cont.)
3.
3. To prevent contaminants entering the pipework,
separate the DHW cylinder from the pipework.
4. Remove loose deposits with a high pressure
cleaner.
!
!
Please note
Water splashes can cause electrical faults.
Protect the electrical components of the heat
pump from water splashes.
Please note
Pointed or sharp cleaning tools will damage
the cylinder interior.
Only use plastic cleaning equipment to clean
the inside.
89