Viessmann VITODENS 111-W Installation And Service Instructions Manual page 15

Fitting the boiler and making connections
Balanced flue connection
Installation sequence
(cont.)
Fill the flue outlet with at least 0.3 l of
water.
!
Please note
Water in the ventilation air supply
can be detrimental to the com-
bustion quality.
Never pour water into the exter-
nal vent.
Connect the balanced flue.
During installation and positioning of the
flue system, observe building regula-
tions part L and BS 5440.
Flue system installation instruc-
tions.
15