Viessmann VITODENS 050-W Installation And Service Instructions Manual page 8

Safety instructions
Safety instructions
Extractors
Operating appliances that
exhaust air to the outside
(extractor hoods, extrac-
tors, air conditioning units,
etc.) can create negative
pressure. If the boiler is
operated at the same
time, this can lead to a
reverse flow of flue gas.
8
(cont.)
Danger
The simultaneous
operation of the
boiler and appliances
that exhausts air to
the outside can result
in life threatening poi-
soning due to a
reverse flow of flue
gas.
Fit an interlock circuit
or take suitable steps
to ensure an ade-
quate supply of com-
bustion air.