Viessmann Vitocrossal 100 Operating Instructions Manual page 22

Maintenance
Maintenance
Cleaning
All equipment can be cleaned with a commercially
available domestic cleaning agent (non-scouring).
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.
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.
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.
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.
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 and
must not be closed off.
22
You can clean the front of the programming unit with a
microfibre cloth.
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.