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Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Venting
Potential gaps between the vent/air intake pipes and
the 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.
This PP(s) vent system is constructed from flame-retardant
plastic [polypropylene rated for a maximum temperature
of 230ºF (110ºC)].
The PP(s) venting system components must be listed
to ULC S636 / UL-1738 (contact one of the venting
suppliers below).
DO NOT mix pipe, fittings, or joining methods from
different vent system manufacturers.
The vent length requirements stated in this manual (on
page 68 for two pipe vent installations and page 73 for
single pipe installations) must be observed.
If using flexible vent or air intake pipe, reduce the max.
equivalent length allowed by 25%.
The PP(s) venting material can be extended (without
exceeding the maximum equivalent length) beyond the
outside wall of the structure, provided that the PP(s)
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.
Requirement for UL/ULC Listed Rigid SS/PP(s) Vent Pipe Material
Requirements for PP(s) and stainless steel
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, 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.
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 vent 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.
Because of its sealed combustion chamber, the Vitocrossal
300, CA3 gas-fired condensing boiler is suitable for
operation with direct vent room air independent operation
(when using air intake system).
Use only material listed in table on page 60, entitled
“Approved venting materials”.
IMPORTANT
IMPORTANT
Side wall vent installations must include a protective
screen.
Vent System Suppliers
Use special venting system (UL/ULC listed for Category
IV) for exhaust vent material of the Vitocrossal boilers.
Contact one of the following suppliers to order parts.
Both suppliers deliver PP(s) rigid and flexible vents
in a variety of sizes.
M&G / Duravent
www.duravent.com
Centrotherm InnoFlue
www.centrotherm.us.com
The remaining space surrounding a chimney liner, gas
vent, or special gas vent or plastic piping installed within
a masonry, metal or factory-built flue shall not be used
to supply combustion air to the boiler. A separate
combustion air intake pipe routed back to the boiler can
be used in the remaining space if required, the boiler
venting system is approved for zero clearance, and can
be run directly beside the combustion air intake pipe.
