Inspection And Maintenance - Viessmann Vitodens 100-W Operating Instructions Manual

Cleaning
The appliances can be cleaned with a commercially
available domestic cleaning agent (non-scouring).
Clean the surface of the programming unit with a
microfibre cloth.

Inspection and maintenance

The inspection and maintenance of a heating system
is prescribed by the German Energy Saving Ordinance
[EnEV] and the DIN 4755, DVGW-TRGI 2018,
DIN 1988-8 and EN 806 standards.
Appliance
Increased contamination raises the flue gas tempera-
ture and thereby increases energy losses. We recom-
mend the appliance is cleaned annually.
DHW cylinder
Standards DIN 1988-8 and EN 806 specify that main-
tenance and cleaning should be carried out no later
than 2 years after commissioning and as required
thereafter.
Only a qualified contractor should clean the inside of
the DHW cylinder and the DHW connections.
Safety valve (DHW cylinder)
The function of the safety valve must be checked
every six months by the user or a contractor through
venting (see valve manufacturer's instructions). The
valve seat may become contaminated.
Water may drip from the safety valve during a heat-up
process. The outlet is open to the atmosphere.
Potable water filter (if installed)
To maintain high hygienic standards, proceed as fol-
lows:
■ Replace filter element on non-back flushing filters
every six months (visual inspection every
two months).
On back flushing filters, back flush every
■
two months.
Regular maintenance ensures trouble-free, energy effi-
cient, environmentally responsible and safe heating.
Your heating system must be serviced by an author-
ised contractor at least every 2 years. For this, it is
best to arrange an inspection and maintenance con-
tract with your local heating contractor.
If any water treatment equipment (e.g. a sluice or
injection system) is installed in the cold water supply of
the DHW cylinder, ensure this is refilled in good time.
For this, observe the manufacturer's instructions.
!
Please note
Overpressure can cause damage.
Do not close the safety valve.
Maintenance
35