Heating System Inspection And Maintenance; Replacing Fuses; Cleaning Information - Viessmann VITOLIGNO 300-C Operating Instructions For The System User

Heating system inspection and maintenance

Regular maintenance ensures trouble-free, energy effi-
cient and environmentally responsible heating. For
this, we strongly advise you to arrange an inspection
and maintenance contract with your heating contractor.
Boiler
Increasing boiler contamination raises the flue gas
temperature and thereby increases energy losses. The
boiler must therefore be thoroughly cleaned by a heat-
ing contractor twice a year.
DHW cylinder (if installed)
Standards DIN 1988-8 and EN 806 specify that main-
tenance or cleaning should be carried out no later than
2 years after commissioning and as required there-
after.
Only a qualified heating contractor should clean the
inside of a DHW cylinder and the DHW connections.
If any water treatment equipment (such as 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.
Safety valve (DHW cylinder)
Check the safety valve function every six months by
venting, or have it checked by your heating contractor.
The valve seat may become contaminated (see the
valve manufacturer's instructions).
Drinking water filter (if installed)
For reasons of good hygiene:
■ Replace the filter element on non-backwashing filters
every 6 months (visual inspection every 2 months).
On backwashing filters, backwash every 2 months.
■

Replacing fuses

Danger
Contact with 'live' components of the control unit
can lead to fatal injury due to electric shock.
Only a heating contractor may replace fuses.

Cleaning information

Have a heating contractor clean the interior of the
boiler once a year.
Additionally, for DHW cylinders with a sacrificial anode:
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.
Danger
Fire from apertures and hot surfaces can cause
dangerous injuries.
Do not open doors or covers on the boiler dur-
■
ing heating operation.
■ Only open the boiler after it has cooled down.
Maintenance
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