Bryant 340AAV Installation, Start-Up, And Operating Instructions Manual page 36

NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
AIR
FLOW
COMBUSTION- COMBUSTION-
AIR AIR
VENT
VENT
*
†
UPFLOW
COMBUSTION-
AIR
VENT
**
AIR
FLOW
† † †
HORIZONTAL-LEFT DISCHARGE
* For Non-Direct Vent (1-Pipe) system, orient elbow so that its
opening faces down.
** For Non-Direct Vent (1-Pipe) system, orient elbow so that its
opening faces sideways.
† An external trap kit (see furnace product data sheet) must be used.
† †
Bottom combustion-air not allowed for non-direct vent
Fig. 35 - - Combustion-Air and Vent Pipe Connections
Assembly of Combustion Air Pipe (Non-Direct Vent/1-Pipe
System ONLY)
1. Permanently install
(factory-supplied in loose parts bag) in combustion-air
elbow using RTV or by cementing, as shown in Fig. 36.
For 120,000 Btuh size units only: separate the 2 halves of
perforated disk assembly and use only the shouldered disk
half.
2. Determine the length of straight portion of combustion-air
inlet pipe from Fig. 36.
3. Cut field-supplied 2-in. (51 mm) diameter PVC pipe to
length as determined per Fig. 36.
4. Permanently attach elbow/perforated disk assembly to
straight portion of pipe using RTV or by cementing as
shown in Fig. 36.
Assembly of Combustion Air Pipe (Direct Vent - - 2-Pipe
System ONLY)
1. Using Table 11, individually determine the diameter of the
combustion air and vent pipe allowed. If different, pick the
larger of these two diameters and use this diameter for
both combustion- -air and vent pipes.
2. When installing vent systems of short pipe length, use the
smallest allowable pipe diameter. Do not use pipe size
greater than required or incomplete combustion, flame
disturbance, or flame sense lockout may occur.
NOTE: Do not count elbows or pipe sections in terminations or
within furnace (All elbows shown in Fig. 42 and Fig. 43 are not
to be counted).
NOTE: Select 1 vent pipe connection and
1 combustion-air pipe connection.
VENT
VENT
*
†
COMBUSTION- COMBUSTION-
AIR AIR
AIR
FLOW
DOWNFLOW
COMBUSTION-
AIR
VENT
**
AIR
FLOW
† †
†
HORIZONTAL-RIGHT DISCHARGE
A05092
perforated disk assembly
NOTE: The 60,000 model includes an inducer outlet restrictor in
the loose parts bag that must be installed for certain vent system
configurations. Referring to Table 12, locate the altitude for the
installation. Discard the restrictor if the vent length is greater
than that shown in Table 12; install the restrictor if the vent length
is less than or equal. Refer to Fig. 37 for positioning of the
restrictor in the inducer outlet. The restrictor is to be trapped
between the vent pipe and inducer outlet. Certain installations
may require removal of the coupling for easier installation of the
inducer outlet restrictor.
FIELD-SUPPLIED
2-IN. (51 mm) DIA.
PVC 90° ELBOW
COMBUSTION-AIR DISC
(FACTORY-SUPPLIED IN
LOOSE PARTS BAG)
Length of Straight Pipe Portion of
Combustion-Air Inlet Pipe Assembly - - In. (mm)
CASING WIDTH
17---1/2 (445)
21(533)
24---1/2 (622)
Fig. 36 - - Combustion-Air Inlet Pipe Assembly
CAUTION
!
UNIT MAY NOT OPERATE
Failure to follow this caution may result in incomplete
combustion, flame disturbance, or flame sense lockout.
When installing combustion air and vent system of short pipe
length, the smallest allowable pipe diameter must be used.
NOTE: A 2-in. (51 mm) diameter pipe must be used within
furnace casing. Make all pipe diameter transitions outside furnace
casing per Fig. 39.
3. If required per Table 11, insert perforated disk assembly
(factory-supplied in loose parts bag) in intake housing
where combustion air pipe will be connected. If half disk
set is required, install only shouldered disk half.
Attachment of Combustion Air Pipe
1. Determine location of combustion air intake pipe
connection to combustion air intake housing as shown in
Fig. 35 for application.
2. Reposition combustion air intake housing plug fitting in
appropriate unused intake housing connection.
3. Install pipe support (factory-supplied in loose parts bag)
into selected furnace casing combustion-air pipe hole. Pipe
support should be positioned at bottom of casing hole.
4. Insert assembled combustion air inlet pipe into intake
housing as shown in Fig. 35.
- - 36 - -
FIELD-SUPPLIED
2-IN. (51 mm) DIA.
PVC PIPE
A
A96211
A
8---1/2 ±1/2 (216 ± 13)
10---1/2 ±1/2 (267 ± 13)
12 ±1/2 (318 ± 13)