Viessmann Vitodens 050-W Installation And Service Instructions Manual page 5

Safety instructions
Safety instructions
(cont.)
Danger
The simultaneous operation of the
boiler and appliances that extract
air to the outside can result in life
threatening poisoning due to
reverse flow of the flue gas.
Fit an interlock circuit or take suita-
ble steps to ensure an adequate
supply of combustion air.
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