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g
or other materials.
Screen
the elbow with a wire mesh screen
no
smaller
than 3/8-inch
square.
(See Fig. 41.)
Crawlspace
ternfinations
require
the open
end of the combustion
air intake pipe to point downward.
Maintain
3 inches (76 ram) of
clearance
below the floor joist insulation
and 12 inches (305 ram)
above the grade.
Screen
the elbow
with a wire
mesh screen
no
smaller
than 3/8-in.
(10 ram) square. (See Fig. 42 and 43.)
CARBON
MONOXIDE
POISONING
HAZARD
Failure
to
follow
the
steps
outlined
below
for
each
appliance
connected
to the venting
system
being placed
into
operation
could
result
in carbon
monoxide
poisoning
or
death.
The following steps shall be followed for each appliance
connected
to the venting
system
being
placed
into
operation,
while all other appliances
connected
to the
venting system are not in operation:
1. Seal any unused openings in venting system.
2. Inspect the venting system
for proper size and
horizontal pitch, as required in the National Fuel Gas
Code, ANSI Z223.1-2006/NFPA
54-2006
or the
CSA
B149.1-05,
Natural
Gas
and
Propane
Installation Code and these instructions. Deternfine
that there is no blockage
or restriction,
leakage,
corrosion and other deficiencies, which could cause
an unsafe condition.
3. As far as practical,
close all building
doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system are
located and other spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes
dryers and
any appliance
not
connected
to the venting
system.
Turn on any
exhaust fans, such as range hoods and bathroom
exhausts, so they are operating at maximum speed.
Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7. Test
for
spillage
from
draft
hood
equipped
appliances at the draft hood relief opening after 5
nfinutes of main burner operation. Use the flame of a
match or candle.
8. If improper venting is observed during any of the
above tests, the venting system must be corrected in
accordance with the National Fuel Gas Code, ANSI
Z223.1-2006/NFPA
54-2006
and/or
CSA
B149.1-05,
Natural Gas and Propane Installation
Code.
9. After it has been deternfined
that each appliance
connected to the venting system properly vents when
tested as outlined
above, return doors, windows,
exhaust
fans,
fireplace
dampers
and
any other
gas-fired
burning
appliance
to
their
previous
conditions of use.
Combustion
Air Termination-Direct
Vent / 2-Pipe
System
Combustion
air pipe must terminate outside
the structure
with the
vent pipe as shown
in Fig. 36. Follow
the clearance
requirements
shown
in Fig. 39. Refer to Vent Termination
section
for complete
details on ternfination
options.
VENT PIPE
General
Furnace vent connection must be attached as shown in Fig. 39.
CARBON
MONOXIDE
POISONING
AND
PROPERTY
DAMAGE
HAZARD
Failure
to follow
this warning
could
result
in personal
iniury or death.
Vent pipes must be airtight.
NOTE:
A 2-in.
(51 ram) diameter
pipe nmst be used within the
furnace
casing.
Make all pipe diameter
transitions
outside
furnace
casing per Fig. 38.
The nfininmm
vent pipe length
for these furnaces
is 5 ft. (I.5M)
Short
pipe
lengths
(5-8
ft. or
1.5M-2.4M)
may
discharge
condensate
droplets.
These
condensate
droplets
may
be
undesirable.
A 12-in.
(305 ram)
nfininmm
offset pipe section
is
recommended
to
reduce
excessive
condensate
droplets
from
exiting
vent pipe outlet. (See Fig. 44.)
Attachment
of Vent Pipe
NOTE:
Vent pipe system
has the same diameter
and same length
as combustion
air pipe as mentioned
in section
"Combustion
Air
Pipe and Vent Pipe Diameter."
[]NIT
DAMAGE
HAZARD
Failure to follow this caution may result in unit component
damage.
Inducer housing
outlet cap nmst be installed and fully
seated against inducer housing. Clamp must be tightened to
prevent any condensate leakage.
Vent pipe must be installed and fully seated against inducer
housing.
Clamp
must
be
tightened
to prevent
any
condensate leakage.
1. Deternfine location of vent pipe connection
to inducer
housing as shown in Fig. 39 for application.
2. Verify synthetic rubber inducer housing outlet cap and
clamp are installed on appropriate unused inducer housing
connection and that clamp is tight.
3. Install vent pipe grommet (factory-supplied
in loose parts
bag) into selected furnace casing vent pipe hole. (See Fig.
28.)
4. Be certain that mating surfaces of inducer housing connec-
tion synthetic rubber coupling, and 2-in. diameter vent
pipe are clean and dry. Assemble the synthetic rubber vent
coupling (with 2 loose clamps) onto inducer housing con-
nection. Insert the 2-in. diameter vent pipe through the
synthetic rubber coupling and fully into inducer housing
connection until it touches a stop inside the inducer hous-
ing outlet. Tighten the screws on both clamps to 15-in lb.
of torque.
5. Install casing hole filler cap (factory-supplied
in loose
parts bag) in unused vent pipe casing hole.
36
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