Intertek ACVC96 Service Instructions Manual page 23

INSTALLATION CONSIDERATIONS
NOTE: This provision does not apply to the combus-
tion 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 horizon-
tally 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
which flue gases may enter a building (door, window,
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 antici-
pated snow build up).
• A vent termination shall not terminate over public walk-
ways 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.
NOTE: In Canada, CAN B149.1 Fuel Gas Code takes pre-
cedence over the preceding termination restrictions.
OTHER THAN
COMBUSTION AIR
TERMINATION INTAKE
NON-DIRECT VENT
VENT/FLUE TERMINATION
10'
12"
3"
GRADE OR HIGHEST
12"
ANTICIPATED
SNOW LEVEL 12"
FORCED AIR
INLET
DIRECT VENT
VENT/FLUE TERMINATION
90% Furnace Vent Termination Clearances
Direct Vent Installations
On upflow units secure the combustion air intake pipe di-
rectly to the air intake coupling. On counterflow units se-
cure the combustion air intake pipe to the air intake cou-
pling using the rubber coupling and worm gear hose clamps
provided with the unit. The counterflow rubber coupling al-
lows service removal of air intake piping internal to the fur-
nace blower compartment. The combustion air intake pipe
can also be secured directly to the counterflow unit air in-
take pipe coupling.
NO TERMINATIONS
ABOVE WALKWAY
4'
4'
12"
NON-DIRECT VENT
VENT/FLUE TERMINATION
Non-Direct Vent Installations
A minimum of one 90° elbow must be installed on the com-
bustion air intake "coupling" to guard against inadvertent
blockage.
T
HE RUBBER ELBOW IS NOT DESIGNED TO SUPPORAT A LOAD.
RUBBER ELBOW IS MOUNTED EXTERNALLY TO THE FURNACE CABINET,
EXTREME CARE MUST BE TAKEN TO ADEQUATELY SUPPORT FIELD-SUPPLIED
VENT/FLUE PIPING, AS DAMAGE CAN RESULT IN LEAKS CAUSING BODILY
INJURY OR DEATH DUE TO EXPOSURE TO FLUE GASES, INCLUDING CARBON
MONOXIDE.
Vent/Flue Pipe Lengths (Non-Direct Vent) and Diam-
eters
Refer to the following table for applicable length, elbows,
and pipe diameter for construction of the vent/flue pipe sys-
tem of a non-direct vent installation. In addition to the vent/
flue pipe, a single 90° elbow must be secured to the com-
bustion air intake to prevent inadvertent blockage. The tee
or elbows used in the vent/flue termination must be included
when determining the number of elbows in the piping sys-
tem.
Vent/Flue and Combustion Air Pipe Lengths and Diam-
eters
Refer to the following table for applicable length, elbows,
and pipe diameter for construction of the vent/flue and com-
bustion air intake pipe systems of a non-direct vent (single
pipe) installation. The number of elbows tabulated repre-
sents the number of elbows and/or tees in each (Vent/Flue
& Combustion Air Intake) pipe. Elbows and/or tees used in
the terminations must be included when determining the num-
ber of elbows in the piping systems.
If the combustion air intake pipe is to be installed above a
finished ceiling or other area where dripping of condensate
will be objectionable, insulation of the combustion air pipe
may be required. Use 1/2" thick closed cell foam insulation
such as Armaflex or Insultube where required.
Vent/Flue Pipe Terminations
The vent/flue pipe may terminate vertically, as through a roof,
or horizontally, as through an outside wall.
Vertical vent/flue pipe termination should be as shown in the
following figures. Refer to Vent/Flue Pipe and Combustion
Air Pipe - Termination Locations section in this manual or
the installation instructions for details concerning location
restrictions. The penetration of the vent through the roof must
be sealed tight with proper flashing such as is used with a
plastic plumbing vent.
WARNING
W
HEN THE
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