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Exhaust Vent/Air Intake Requirements
Combustion air supply
General requirements
The Vitodens 100-W and
Vitodens 200-W boilers must be
located in such a way that the vent
length is as short as possible and that
the vent can be routed as directly (and
with as few bends) as possible.
The minimum equivalent vent length is
4 ft. / 1.2 m.
See tables 35., 36. and 37. for
maximum and minimum vent lengths.
All products of combustion must be
safely vented to the outdoors.
The Vitodens boiler is not approved for
common-venting applications. Do not
common-vent with any other appliance.
The Vitodens boiler vents under
positive pressure and is a Category IV
boiler.
WARNING
Failure to ensure that all flue gases
have been safely vented to the
outdoors can cause property damage,
severe personal injury, or loss of life.
Flue gases may contain deadly carbon
monoxide.
(continued)
CAUTION
Do not locate boiler in areas where
high dust levels or high humidity level s
are present.
*
CAUTION
Do not install boiler during
construction involving drywall or
heavy dust of any kind. Dust can
accumulate in the burners and cause
sooting. Install boiler after all heavy
dust construction is completed.
*
Typically when the boiler is used as
a temporary heat source during the
building construction phase.
Viessmann recommends that the entire
vent system be checked by a licensed
professional heating contractor at least
once each year following initial
installation.
The stainless steel special venting
system is completely sealed when fully
assembled. Locking bands are used to
reinforce the joints between pipe and
fittings.
WARNING
Different manufacturers offer a
number of different joint systems and
adhesives. Do not mix pipes, fittings
and/or joining methods from different
manufacturers. Failure to comply
could result in leakage, potentially
causing personal injury or death.
Do not install vent pipe such that flue
gases flow downwards. The direction
of flue gas flow must be vertically
upwards or horizontal with an upward
slope.
Ensure there is no flue gas leakage into
the area in which the boiler is installed.
Direct Venting (Two-pipe System)
CAUTION
If the boiler has been exposed to high
dust levels, all burners and the heat
exchanger must be cleaned prior to
use.
CAUTION
If above criteria are not properly
observed and boiler damage results,
any warranty on the complete boiler
and related components will be null
and void.
Check joints for leaks with the gas
supply turned off and the fan running.
Use a soapy solution to check for vent
leaks.
Condensate must drain from the flue
pipe to the boiler. Ensure a suitable
gradient of at least 3º (approx. 2" per
3.3 ft. / 50 mm per 1 m).
No condensate trap is required in the
vent pipe system.
39
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