Bryant 355MAV Furnace User Manual


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NOTE: A 2-in. diameter pipe must be used within the furnace casing. Make all pipe diameter transitions outside furnace casing.
g. Drill a 1/8-in. hole in 2-in. combustion-air pipe using hole in intake housing as a guide.
h. Install a field-supplied No. 6 or No. 8 sheet metal screw into combustion-air pipe.
NOTE: DO NOT OVERTIGHTEN SCREW. Breakage to intake housing or fitting may cause air leakage to occur.
NOTE: Do not attach combustion-air intake pipe permanently to combustion-air intake housing since it may be necessary to remove pipe for
service of ignitor or flame sensor.
Combustion-Air Intake Housing Plug Fitting: The combustion-air intake plug fitting must be installed in unused combustion-air intake housing.
This fitting must be attached by using RTV sealant, or by drilling a 1/8-in. hole in fitting, using hole in intake housing as a guide. Install a
field-supplied No. 6 or No. 8 sheet metal screw.
NOTE: DO NOT OVERTIGHTEN SCREW. Breakage to intake housing or fitting may cause air leakage to occur.
A plugged drain connection has been provided on this fitting for use when moisture is found in combustion-air intake pipe and combustion box.
NOTE: Moisture in combustion-air intake may be result of improper termination. Ensure combustion-air intake pipe termination is similar to that
shown in Fig. 39, 40, 41, 42, and 43 so it will not be susceptible to areas where light snow or other sources of moisture could be pulled in.
Table 7—Maximum Allowable Pipe Length (ft) (Continued)
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123 4 5 6
4001 to 5000‡
042040
2 Pipe or 2-in
Concentric
1-1/2 40 35 30 25 20 15
2 707070 70 70 70
042060
2 Pipe or 2-in
Concentric
1-1/2 40 35 30 25 20 15
2 707070 70 70 70
042080
060080
2 Pipe or 2-in
Concentric
1-1/2 23 18 13 8 NA NA
2 707070 70 70 68
060100
2 Pipe or 2-in
Concentric
2 363126 21 16 11
2-1/2 70 70 70 70 70 70
060120
2 Pipe or 3-in.
Concentric
3† 56 55 54 53 52 52
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123 4 5 6
5001 to 6000‡
042040
2 Pipe or 2-in
Concentric
1-1/2 37 32 27 22 17 12
2 707070 70 70 70
042060
2 Pipe or 2-in
Concentric
1-1/2 37 32 27 22 17 12
2 707070 70 70 70
042080
060080
2 Pipe or 2-in
Concentric
1-1/2 22 17 12 7 NA NA
2 707070 70 68 63
060100
2 Pipe or 2-in
Concentric
2 332823 18 13 8
2-1/2 70 70 70 70 70 70
060120
2 Pipe or 3-in.
Concentric
3† 53 52 50 49 48 47
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123 4 5 6
6001 to 7000‡
042040
2 Pipe or 2-in
Concentric
1-1/2 35 30 25 20 15 10
2 707068 67 66 64
042060
2 Pipe or 2-in
Concentric
1-1/2 35 30 25 20 15 10
2 707068 67 66 64
042080
060080
2 Pipe or 2-in
Concentric
1-1/2 20 15 10 5 NA NA
2 707068 67 62 57
060100
2 Pipe or 2-in
Concentric
2 312621 16 11 6
2-1/2 70 70 68 67 66 64
060120
2 Pipe or 3-in.
Concentric
3† 49 48 47 45 44 43
ALTITUDE (FT) UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123 4 5 6
7001 to 8000‡
042040
2 Pipe or 2-in
Concentric
1-1/2 32 27 22 17 12 7
2 666563 62 60 59
042060
2 Pipe or 2-in
Concentric
1-1/2 32 27 22 17 12 7
2 666563 62 60 59
042080
060080
2 Pipe or 2-in
Concentric
1-1/2 18 13 8 NA NA NA
2 666563 62 57 52
060100
2 Pipe or 2-in
Concentric
2 292419 14 9 NA
2-1/2 66 65 63 62 60 59
060120
2 Pipe or 3-in.
Concentric
3† 46 44 43 41 40 38
See notes at end of table.
—35—
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