Cleaning - Viessmann VITODENS Operating Instructions Manual

Maintenance

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 Energy Saving Ordinance [EnEV -
Germany] and the DIN 4755, DVGW-TRGI 2008 and
DIN 1988-8 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 (if installed)
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 heating contractor should clean the
inside of a DHW cylinder and the DHW connections.
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.
In this connection, observe the manufacturer's instruc-
tions.
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.
52
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.
In addition for Vitocell 100:
We recommend that the correct function of the sacrifi-
cial anode is checked annually by your heating con-
tractor.
The function of the sacrificial anode can be checked
without interrupting the system operation. The heating
contractor will check the earth current with an anode
tester.
!
Please note
Overpressure can cause damage.
Do not close the safety valve.