Viessmann SDIO Installation And Service Instructions For Contractors page 5

Electronics module
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Safety instructions
Safety instructions
(cont.)
Danger
The simultaneous operation of the
boiler and appliances that exhausts
air to the outside can result in life
threatening poisoning due to a
reverse flow of flue gas.
Fit an interlock circuit or take suita-
ble steps to ensure an adequate
supply of combustion air.
5

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