24
COMBUSTION AIR TERMINA
TION-- DIRECT
VENT/2-- PIPE
SYSTEM
Combustion air pipe must terminate outside the structure with the
vent pipe as shown in Fig. 31. Follow the clearance requirements
show in Fig. 34. Refer to Vent Termination section for complete
details on termination options.
VENT
PIPE
General
Furnace vent connection must be attached as shown in Fig. 25.
CARBON MONOXIDE POISONING AND
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in property
damage, personal injury, or death.
Vent pipes must be airtight.
!
WARNING
NOTE: A 2--in. diameter pipe must be used within the furnace
casing. Make all pipe diameter transitions outside furnace casing
per Fig. 24.
The minimum vent pipe length for these furnaces is 5 ft. Short
pipe lengths (5--8 ft) may discharge condensate droplets. These
condensate droplets may be undesirable. A 12 -- in. minimum
offset pipe section is recommended to reduce excessive
condensate droplets from exiting vent pipe outlet. (See Fig. 30.)
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.”
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component
damage.
Vent pipe must be installed and fully seated against inducer
housing. Clamp must be tightened to prevent any
condensate leakage.
CAUTION
!
1. Determine location of vent pipe connection to inducer
housing as shown in Fig. 25 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 combustion--air pipe grommet (factory-- supplied in
loose parts bag) into selected furnace casing vent pipe
hole. (See Fig. 18.)
4. Be certain that mating surfaces of inducer housing
connection 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
connection. 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 housing outlet. Tighten the screws on both
clamps to 15 -- in-- lb. of torque.
NOTE: Starting at furnace, slope vent pipe a minimum of
1/4--in. per linear ft back toward furnace with no sags between
hangers.
5. Install casing hole filler cap (factory--supplied in loose
parts bag) in unused vent pipe casing hole.
VENT TERMINA
TION
General
Combustion--air (direct vent/2--pipe system only) and vent pipe
must terminate outside structure, either through sidewall or roof.
For vent termination clearance, refer to Fig. 34 for Direct
Vent/2--Pipe system and Fig. 35 for Ventilated Combustion Air
option.
Roof termination is preferred since it is less susceptible to damage
or contamination, and it has less visible vent vapors. Sidewall
termination require sealing or shielding of building surfaces with
a corrosive resistance material due to corrosive combustion
products of vent system.
NOTE: (Direct Vent/2--Pipe system ONLY) A factory accessory
termination kit MUST be used. See section “Vent T ermination Kit
(Direct Vent/2--Pipe System Only)” in this instruction.
When determining appropriate location for termination, consider
the following guidelines:
1. Comply with all clearance requirements stated in Fig. 34
or Fig. 35 per application.
2. Termination or termination kit should be positioned where
vent vapors will not damage plants/shrubs or air
conditioning equipment.
3. Termination or termination kit should be positioned so that
it will not be affected by wind eddy, such as inside
building corners, nor by recirculation of flue gases,
airborne leaves, or light snow.
4. Termination or termination kit should be positioned where
it will not be damaged by or subjected to foreign objects
such as stones, balls, etc.
5. Termination or termination kit should be positioned where
vent vapors are not objectionable.
Extended Exposed Sidewall Pipes
Sidewall combustion air pipe termination (direct vent/2 -- pipe
system only) and vent pipe termination may be extended beyond
areashowninFig.31orinFig.32perapplicationinoutside
ambient by insulating pipe as indicated in Table 7.
1. Determine combustion air pipe diameter (direct
vent/2-- pipe system only) and vent pipe diameter, as stated
above, using total pipe length and number of elbows.
2. Using winter design temperature (used in load
calculations), find appropriate temperature for your
application and furnace model.
3. Determine required insulation thickness for exposed pipe
length(s).
NOTE: Pipe length(ft) specified for maximum pipe lengths
located in unconditioned spaces cannot exceed total allowable
pipe length as specified in Table 8.
Vent Termination Kit (Direct Vent/2--Pipe System Only)
NOTE: Always refer to the instructions in termination kit for the
latest version.
Combustion air and vent pipes MUST terminate outside structure.
A factory accessory termination kit must be installed as shown in
Table 6. There are four options of vent/combustion air
termination kits available as shown in Table 6.
58UVB
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