GM9S96 Service Manual
SYSTEM OPERATION
13
It is the responsibility of the installer to follow the manufactur-
Additionally, it is the responsibility of the installer to ensure
that all piping and connections possess adequate structural
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ing, or sagging during furnace operation.
a non-direct vent (single pipe) or direct vent (dual pipe) ap-
pliance. A non-direct vent installation requires only a vent/
direct vent installation requires both a vent/
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propriate section for details concerning piping size, length,
number of elbows, furnace connections, and terminations.
WARNING
Precautions should be taken to prevent condensate from
exposed to temperatures below 35°F for extended periods
terminations shown in this manual (or in unheated areas)
piping for leaks prior to installing insulation.
The following bullets and diagram describe the restrictions
combustion air intake pipe (when applicable) terminations.
termination construction.
• All terminations must be located at least 12 inches
above ground level or the anticipated snow level.
• Vent terminations must terminate at least 3 feet above
any forced air inlet located within 10 feet.
• This provision does not apply to the combustion
air intake termination of a direct vent application.
• The vent termination of a non-direct vent application
must terminate at least 4 feet below, 4 feet horizontally
from, or 1 foot above any door, window, or gravity air
inlet into any building.
• The vent termination of a direct vent application must
terminate at least 12 inches from any opening through
or gravity air inlet).
• The vent termination of vent pipe run vertically through
a roof must terminate at least 12 inches above the roof
line (or the anticipated snow level) and be at least 12
inches from any vertical wall (including any anticipated
snow build up).
• A vent termination shall not terminate over public
walkways or over an area where condensate or
vapor could create a nuisance or hazard or could be
detrimental to the operation of regulators, relief valves,
or other equipment.
• The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
In Canada, the B149 Fuel Gas Code takes prece-
dence over the preceding termination restrictions.
On upow units secure the combustion air intake pipe directly
to the air intake coupling. On counterow units secure the
combustion air intake pipe to the air intake coupling using the
rubber coupling and worm gear hose clamps provided with
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moval of air intake piping internal to the furnace blower com-
partment. The combustion air intake pipe can also be secured
A minimum of one 90° elbow must be installed on the com-
bustion air intake “coupling” to guard against inadvertent
blockage.
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WARNING
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Refer to the following tables for applicable length, elbows, and
a single 90° elbow must be secured to the combustion air in-
take to prevent inadvertent blockage. The tee or elbows used
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ing the number of elbows in the piping system.