Bryant 345MAV Installation, Start-Up, And Operating Instructions Manual page 25

ALTITUDE (FT) UNIT SIZE
024040
036040
024060
036060
048060
036080
048080
0 to 2000
060080
048100
060100
060120
ALTITUDE (FT) UNIT SIZE
024040
036040
024060
036060
048060
036080
2001 to 3000
048080
060080
048100
060100
060120
ALTITUDE (FT) UNIT SIZE
024040
036040
024060
036060
048060
036080
3001 to 4000
048080
060080
048100
060100
060120
See notes at end of table
COMBUSTION AIR PIPE
CAUTION: Combustion air must not be taken from
inside a structure that is frequently contaminated by
halogens, which include fluorides, chlorides, bromides,
and iodides. These elements are found in aerosols,
detergents, bleaches, cleaning solvents, salts, air freshen-
ers, adhesives, paint, and other household products.
Locate combustion-air inlet as far as possible from
swimming pool and swimming pool pump house.
Excessive exposure to contaminated combustion air will
result in safety and performance related problems.
NOTE: Furnace combustion-air connections are sized for 2-in.
pipe. The combustion-air pipe will be 2-in. diameter in all
installations.
TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT)
TERMINATION PIPE DIA
TYPE (IN.)*
2 Pipe or 2-in
1-1/2
Concentric
1-1/2
2 Pipe or 2-in
Concentric
1-1/2
2 Pipe or 2-in
Concentric
2-1/2
2 Pipe or 3-in
2-1/2
Concentric
2-1/2 one disk
2 Pipe or 3-in.
Concentric
3† no disk
TERMINATION PIPE DIA
TYPE (IN.)*
1-1/2
2 Pipe or 2-in
Concentric
1–1/2
2 Pipe or 2-in
Concentric
2 Pipe or 2-in
Concentric
2-1/2
2–1/2
2 Pipe or 3-in
Concentric
2 Pipe or 3-in.
3† no disk
Concentric
4† no disk
TERMINATION PIPE DIA
TYPE (IN.)*
1-1/2
2 Pipe or 2-in
Concentric
1–1/2
2 Pipe or 2-in
Concentric
2 Pipe or 2-in
Concentric
2-1/2
2-1/2
2 Pipe or 3-in
Concentric
3† no disk
2 Pipe or 3-in.
Concentric
4† no disk
—25—
NUMBER OF 90° ELBOWS
1 2
1 5 NA
70 70
2 70 70
20 15
2 70 70
10 NA
2 55 50
70 70
2 5 NA
40 30
3 70 70
10 NA
3† 45 40
70 70
NUMBER OF 90° ELBOWS
1 2
67 62
2 70 70
17 12
2 70 67
2 49 44
70 70
35 26
3 70 70
3 14 9
70 70
70 70
NUMBER OF 90° ELBOWS
1 2
64 59
2 70 70
16 11
2 68 63
2 46 41
70 70
33 24
3 70 70
65 58
70 70
See Table 8 for required clearances.
Furnace combustion-air connection must be attached as shown in
Fig. 34. Combustion-air intake housing plug may need to be
relocated in some applications.
Combustion-air pipe must terminate outside of furnace casing with
1 elbow. Orient elbow so that opening faces down for upflow or
downflow applications. Orient elbow so that it faces sideways (left
or right) for horizontal left or horizontal right applications. (See
Fig. 34.) Maintain a 3-in. minimum clearance between the opening
of the combustion-air inlet pipe and any object.
NOTE: All pipe joints must be cemented except attachment of
combustion-air inlet pipe to inlet housing connection, since it may
be necessary to remove pipe for servicing.
Install combustion air inlet pipe as follows:
1. Assemble combustion-air inlet pipe.
3 4 5
NA NA NA
65 60 60
70 70 70
10 5 NA
70 70 70
NA NA NA
35 30 30
70 70 70
NA NA NA
20 20 10
70 70 70
NA NA NA
35 30 25
70 70 70
3 4 5
57 52 52
70 70 70
7 NA NA
66 61 61
30 25 25
70 70 70
16 16 6
70 70 66
NA NA NA
63 56 50
70 70 70
3 4 5
54 49 48
70 70 70
6 NA NA
62 57 57
28 23 22
70 70 70
15 14 5
70 66 61
51 44 38
70 70 70
6
NA
55
70
NA
70
NA
20
70
NA
NA
70
NA
20
70
6
47
70
NA
61
15
70
NA
61
NA
43
70
6
43
70
NA
56
13
70
NA
56
31
70