Viessmann VITOLIGNO 300-P Operating Instructions Manual page 56

Maintenance
Inspection and maintenance
Regular maintenance ensures a trouble-free, energy-efficient and environmentally
responsible heating operation. For this, we strongly advise you to arrange an
inspection and maintenance contract with your local heating contractor.
Boiler
Increasing boiler contamination raises
the flue gas temperature and thereby
increases energy losses. All boilers
should therefore be cleaned annually.
DHW cylinder (if installed)
Standards DIN 1988-8 and EN 806
specify that maintenance and cleaning
should be carried out no later than two
years after commissioning and
thereafter as required.
Only a qualified heating contractor
should clean the inside of a DHW
cylinder and the DHW connections.
Refill any water treatment equipment
(e.g. a lock or injection equipment) in
good time, if such equipment is installed
in the cold water supply of the DHW
cylinder. In this connection, observe the
manufacturer's instructions.
In addition for Vitocell 100:
We recommend that the correct function
of the sacrificial anode is checked
annually by your heating contractor. The
anode function can be checked without
interrupting the system operation. The
heating contractor will check the earth
current with an anode tester.
56
(cont.)
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 (where installed)
For hygiene reasons:
■ Replace filter insert on non-back
washing filters every six months
(visual inspection every two months)
■ On back washing filters, back wash
every two months.