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VII. Venting (continued)
E. Vent and Combustion Air Terminals
1. Vent Piping
a. Install fire stops where vent passes through
floors, ceilings or framed walls. The fire stop
must close the opening between the vent pipe
and the structure.
b. Whenever possible, install vent straight through
the roof.
c. Size roof opening to maintain minimum clearance
of 1 in. (25 mm) from combustible materials.
d. Extend vent pipe to maintain minimum vertical
distance for expected snow accumulation.
Provide brace as required.
e. Install storm collar on vent pipe immediately
above flashing. Apply Dow Corning Silastic 732
RTV Sealant or equivalent between vent pipe
and storm collar to provide weather-tight seal.
2. Combustion Air Piping
a. If possible, locate combustion air termination in
the same roof location as the vent termination
to prevent nuisance shutdowns. Combustion air
terminal may be installed closer to roof than vent.
Alternatively, this appliance may be installed
a with vertical roof vent terminal and sidewall
combustion air terminal.
b. Size roof opening to allow easy insertion
of combustion air piping and allow proper
installation of flashing and storm collar to prevent
moisture from entering the structure.
c. Use appropriately designed vent flash when
passing through roofs. Follow flashing
manufacturers' instructions for installation.
d. Extend combustion air pipe to maintain minimum
vertical and horizontal distance of 12 in (300 mm)
from roof surface.
CAUTION
CAUTION
!
Reliable operation of this appliance is not
guaranteed when the terminals are subject to
winds above 40 mph.
F o l l o w i n g t h e r e c o m m e n d e d t e r m i n a l
configurations and required spacing and
dimensions will prevent recirculation of flue
products into the combustion air. Recirculation of
the flue products can cause damage to property
or the appliance.
Methods of securing and sealing terminals to
the outside wall must not restrain the thermal
expansion of the vent pipe.
Exterior run to be included in equivalent vent/
combustion air lengths.
Vertical Venting and combustion air roof
penetrations (where applicable) require the
use of roof flashing and storm collar, which
are not supplied with appliance, to prevent
moisture from entering the structure.
Examine all components for possible shipping
damage prior to installation.
All condensate that forms in vent must be able
to drain back to the Heat exchanger.
The venting system must be free to expand and
contract and must be supported in accordance
with installation instructions included by the
original component manufacturers, whenever
applicable. Polypropylene pipe sections must
be disengaged 1/4 to 5/8 in. (6 mm to 16 mm)
per joint to allow for thermal expansion.
!
Failure to vent this appliance in accordance
with these instructions could cause products of
combustion to enter the building resulting in
severe property damage, personal injury or death.
Do not locate vent termination under a deck, or
where exposed to prevailing winds.
Do not locate combustion air termination where
volatile vapors or other chemicals are present.
Severe corrosion and failure will result.
Do not interchange vent systems or materials
unless otherwise specified.
Do not apply thermal insulation to vent pipe or
fittings.
Do not use a barometric damper; draft hood or
vent damper with this appliance.
Atmospheric venting is prohibited.
28
NOTICE
NOTICE
WARNING
WARNING
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