Operation With Direct Vent Using Coaxial Vent System - Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual

Safety
Important Regulatory and Installation Requirements
IMPORTANT
When replacing parts, use original Viessmann or Viessmann
approved replacement parts.
For coaxial and rigid PP(s) venting system only;
Venting material must be ULC S636 listed.
The venting system must be installed by a licensed
professional heating contractor familiar with the operation
and maintenance of heating appliances and venting.
Before installing this product, ensure that the complete
installation literature has been read. Failure to follow
proper installation procedures as stated in these
instructions, including vent pitch and proper appliance
connections, may violate local, provincial/state, or national
codes and cause unsafe conditions which may lead to
severe property damage or personal injury.
The venting system must be installed in accordance with
local building code requirements as well as national codes.
For installations in Canada use CAN/CSA-B149.1 Natural
Gas Installation Code or CAN/CSA-B149.2 Propane
Installation Code as applicable; in the U.S. use the National
Fuel Gas Code ANSI Z223.1 or NFPA Standard 54.
Always use the latest edition of the applicable standard.
To ensure safe operation of the appliance, Viessmann
recommends that the system be inspected once a year by
a qualified service technician.
Every venting system must be planned and installed for
optimum performance and safety. These Installation
Instructions are designed to help you determine venting
requirements and limitations with respect to installation.
Please read and follow these instructions carefully.
It is the responsibility of the installer to contact local
building and fire officials concerning any installation
restrictions and/or inspection requirements that may apply.
Permits may be required before commencement of the
installation.
The vent termination for side wall air intake installations
should be located on a wall that is least affected by
prevailing winds. High winds may affect boiler operation
and/or degrade the exterior finish of the wall. They may
also cause recirculation of the appliance's own flue
products. Recirculation of flue products can result in poor
combustion and inlet condensation problems. If wind
is a problem, steps must be taken to shield the vent
termination from high winds, such as building a fence
or planting shrubs. Ensure that the total equivalent vent
length is not exceeded.

Operation with direct vent using coaxial vent system

IMPORTANT
Side wall vent installations must include Viessmann
protective screen.
Because of its sealed combustion chamber, the Vitodens
gas-fired condensing boiler is suitable for operation with
balanced flue.
8
Vitodens Rigid and Flex Venting Systems Installation
(continued)
The Vitodens boiler, flue gas adaptor and parallel adaptor
(if used) are approved together under CSA 4.9. ANSI
Z21.13 Standard.
The venting system components are tested and listed to
ULC S636 or UL 1738 and are marked and labelled on
each component.
IMPORTANT
DO NOT mix pipe, fittings, or joining methods from
different vent system manufacturers.
DO NOT use adhesives of any kind with this venting system.
The vent length requirements stated in this manual
(starting on page 43 for direct vent installations and page
66 for single pipe vent installations) must be observed.
The combustion air is supplied and the flue gas discharged
via a coaxial double pipe. Combustion air is fed through
the circular gap between the outer aluminum air intake pipe
and the vent pipe. Flue gases are discharged via an inner
pipe constructed from flame-retardant plastic (polypropylene
rated for a maximum temperature of 230ºF (110ºC).
Not all inspection authorities require a leak test of the
vent-air intake system in conjunction with the wall-
mounted gas-fired boiler during system start-up.
In cases where the leak test is not required, Viessmann
recommends that the heating contractor perform
a simplified leak test when starting up the system.
For this purpose, it is sufficient to measure the CO
concentration in the combustion air of the circular gap
of the coaxial vent-air intake pipe. The vent pipe is
considered sufficiently leak-proof if the CO
in the combustion air is no higher than 0.2% and the O
concentration no lower than 20.6%.
If higher CO or lower O
2 2
gas system must be checked for leaks.
The coaxial venting material can be extended (without
exceeding the maximum equivalent length) beyond the
outside wall of the structure, provided that the coaxial
venting material is installed in an enclosed, insulated
and waterproof chase that is acceptable for outdoor
installation. The vent termination location must comply
with the instructions and codes stated in this manual.
IMPORTANT
Potential gaps between the vent-air intake and surrounding
construction which may cause air, rain or flue gases to
leak into the wall or the building, must be sealed with
approved sealant/caulking to prevent leakage of any kind.
2
concentration
2
values are measured, the flue
2