Exhaust Vent/Air Intake Requirements; Combustion Air Supply - Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual

Vitodens Rigid and Flex Venting Systems Installation

Exhaust Vent/Air Intake Requirements

Combustion Air Supply

The Vitodens boiler is suitable for sidewall, as well as
vertical venting. The Vitodens 100-W, 222-F and 200-W
boilers are approved for both direct vent (sealed
combustion), as well as direct exhaust (non-sealed
combustion) operation in both horizontal and vertical
arrangements. For non-sealed combustion vent systems
(i.e. room-air dependent), see appropriate section under
"Single Pipe Venting" starting on page 53 in this manual.
The boiler must be connected to a direct vent system
in which all air for combustion is taken from the outside
atmosphere and all combustion products are discharged
safely to the outdoors.
The boiler must be vented and supplied with combustion
air and exhaust vent as described in this section. Ensure
the vent and combustion air supply comply with these
instructions.
CAUTION
Do not locate boiler in areas where high dust levels or
high humidity levels 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.
Direct Venting (Two-pipe System)
Inspect all finished exhaust vent/air intake piping to ensure:
Vent/air intake pipe and fittings are of approved material.

Acceptable size, length and number of elbows on

combined vent/air intake system.
Installation is in accordance with prevailing provisions

of local codes.
Installation complies with the requirements of these

instructions, as well as the exhaust vent/air intake
supplier's instructions.
The exhaust vent and combustion air intake system and
terminations may be installed in one of the following type
terminations (2-pipe system):
1. Horizontal air intake and exhaust vent pipes.
2. Vertical air intake and exhaust vent pipes.
3. Horizontal air intake pipe and vertical exhaust vent pipe.
If there is moisture or high humidity existing in the room
where the combustion air intake is installed, condensation
formation on the inlet pipe may occur. Either a type 'B'
(insulated) pipe or an insulated inlet pipe shall be used.
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.
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