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General Installation Information
Recommended venting practice
Leak test (for coaxial venting systems only)
Boiler vent pipe adaptor installation (for WB2 6-24C, 6-24 and WB2 8-32 only)
Fig. 1
Installing the boiler vent pipe adaptor
(continued)
When installing a venting system the
following recommended venting
practices apply:
H Keep length and number of 90º
elbows to a minimum.
H Try not to use back-to-back 90º
elbows.
H Use 45º elbows where possible to
minimize the number of 90º elbows
in case redirection of flue gas is
required.
Viessmann recommends that the
heating contractor perform a simplified
leak test during boiler start-up. For this
purpose it is sufficient to measure the
CO
concentration of the combustion
2
air in the annular gap of the air intake
pipe. The vent pipe is considered
sufficiently leak-proof if a CO
concentration in the combustion air no
higher than 0.2% or an
O
concentration no lower than 20.6%
2
is measured relative to a starting O
concentration of 20.9%.
H The special vent system shall not be
routed into, through, or within any
other vent such as an existing
masonry or factory-built chimney.
Exception:
A masonry chimney flue may be used
to route the venting system only if no
other appliance is vented in the same
flue.
If higher CO
2
are measured, inspect the venting
system thoroughly.
Continuous short cycling of the boiler
can indicate a leaking venting system.
Note that the vent pipe adaptor comes
2
with two measurement ports, one for
combustion air intake measurement
and one for flue gas measurement.
2
1. Apply moderate amount of supplied
lubricant to inner and outer gaskets
of boiler vent pipe adaptor
2. Fully insert boiler vent pipe adaptor
into opening provided.
General Information
values or lower O
values
2
.
11
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