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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Commissioning
IMPORTANT
Seal Test on Coaxial Flue System
(annular gap check)
Legend
A Combustion air aperture
If the test port is not sealed, combustion air is drawn in
from the room. After the leak test, re-seal the test port
with the plug.
For sealed combustion, coaxial vent only
Viessmann strongly recommends that the heating
contractor perform a simplified leak test during boiler
start-up. For this purpose it is sufficient to measure the
CO
2
concentration of the combustion air in the coaxial
gap of the air intake pipe. The vent pipe is considered
sufficiently leak-proof if a CO
2
concentration in the
combustion air no higher than 0.2% or an O
2
concentration
no lower than 20.6% is measured.
If higher CO
2
values or lower O
2
values are measured,
check venting system thoroughly.
Note: The vent pipe adaptor comes with two measurement
ports, one for combustion air intake measurement
and one for flue gas measurement.
Note: This test is not applicable for single-wall venting
systems (non-sealed combustion).
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