Viessmann VITODENS Operating Instructions Manual page 4

Safety instructions
For your safety
Extractors
Operating appliances that extract air to
the outside (cooker hoods, extractors, air
conditioning units, etc.) can create neg-
ative pressure. If the boiler is operated at
the same time, this can lead to reverse
flow of the flue gas.
Danger
The simultaneous operation of
the boiler and appliances that
extract air to the outside can
result in life threatening poison-
ing due to reverse flow of the flue
gas.
Take suitable steps to ensure an
adequate supply of combustion
air. If necessary, contact your
heating contractor.
Auxiliary components, spare and
wearing parts
!
Please note
Components not tested with the
heating system may damage it or
affect its functions.
Have installation or replacement
work only carried out by qualified
contractors.
4
(cont.)