Viessmann VITOCROSSAL Service Instructions Manual page 5

Single boiler: 80 to 318 kw. twin boiler: 240 to 636 kw. gas condensing boiler with matrix cylinder burner. open flue and room sealed operation

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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.

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