Bryant 340AAV Installation, Start-Up, And Operating Instructions Manual page 42

ALTITUDE UNIT SIZE
(BTUH)
FT (M)
40,000
60,000
80,000
9001 to 10,000‡
(2743 to 3048)
100,000
120,000
140,000
* Disk usage-Unless otherwise specified, use perforated disk assembly (factory-supplied in loose parts bag).
# If one disk is stated, separate 2 halves of perforated disk assembly and use shouldered disk half. When using shouldered disk half, install screen side toward inlet box.
† Wide radius elbow.
‡ Vent sizing for Canadian installations over 4500 ft (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction. NA-Not Allowed;
pressure switch will not make.
NOTES:
1. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
2. Size both the combustion-air and vent pipe independently, then use the larger diameter for both pipes.
3. Assume two 45° elbows equal one 90° elbow. Wide radius elbows are desirable and may be required in some cases.
4. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
5. The minimum pipe length is 5 ft (1.5 M) for all applications.
6. Use 3-in. (76 mm) diameter vent termination kit for installations requiring 4-in (102 mm) diameter pipe.
Table 12 – Vent Length for Outlet Restrictor Usage (60,000 btu model only) - - Ft (M)}
ALTITUDE --- FT (M)
0 --- 2000 (0 --- 610)
2001 --- 3000 (610 --- 914)
3001 --- 4000 (914 --- 1219)
4001 --- 5000 (1219 --- 1524)
5001 --- 6000 (1524 --- 1829)
6001 --- 7000 (1829 --- 2134)
7001 --- 8000 (2134 --- 2438)
8001 --- 9000 (2438 --- 2743)
9001 --- 10000 (2743 --- 3048)
Discard outlet restrictor if vent lengths or elbows exceed the above table Discard restrictor if using 11/2---in. (38mm) diameter pipe. See Fig. 37 and 38 for
}
proper installation.
Table 11—Maximum Allowable Pipe Length - - Ft (M) (Continued)
DIRECT VENT (2-PIPE) ONLY
TERMINATION PIPE DIA
TYPE IN. (mm)*
2 Pipe or 2-in 1-1/2 (38)
Concentric 2 (51)
2 Pipe or 2-in
2 (51)
Concentric
2 (51)
2 Pipe or 2-in
Concentric
2-1/2 (64)
2-1/2 (64)
2 Pipe or 3-in
Concentric
3 (76)
NA
2 Pipe or 3-in.
Concentric
4 (102)† no
disk
DIRECT VENT
(2---PIPE)
UNIT SIZE
PIPE DIA.
(IN / mm)
2---in. (51)
2---in. (51)
2---in. (51)
2---in. (51)
60,000 2---in. (51)
2---in. (51)
2---in. (51)
2---in. (51)
2---in. (51)
NON-DIRECT
VENT (1-PIPE)
ONLY
PIPE DIA
1
IN. (mm)*
42
1-1/2 (38)
(12.8) (11.3)
57
2 (51)
(17.4) (16.8)
45
2 (51)
(13.7) (12.2)
30
2 (51)
(9.1)
57
2-1/2 (64)
(17.4) (16.8)
21
2-1/2 (64)
(6.4)
54
3 (76)
(16.5) (14.9)
39
3 (76)†
(11.9) (11.3)
10
4 (102)† no disk
(3.0)
NA
NON---DIRECT
VENT
(1---PIPE ONLY)
PIPE DIA.
1
(IN / mm)
2---in. (51) 28 (8.5)
2---in. (51) 24 (7.3)
2---in. (51) 21 (6.4)
2---in. (51) 17 (5.1)
2---in. (51) 14 (4.2)
2---in. (51) 10 (3)
2---in. (51) 6 (1.8)
2---in. (51)
2---in. (51)
- - 42 - -
NUMBER OF 90° ELBOWS
2 3 4 5
37 32 27 25
(9.8) (8.2) (7.6)
55 53 51 49
(16.2) (15.5) (14.9)
40 38 33 31
(11.6) (10.1) (9.4)
25 14 9 7
(7.6) (4.3) (2.7) (2.1)
55 53 51 49
(16.2) (15.5) (14.9)
13 5
NA NA
(4.0) (1.5)
49 44 39 34
(13.4) (11.9) (10.4)
37 35 33 31
(10.7) (10.1) (9.4)
5
NA NA NA
(1.5)
NO. OF 90_ ELBOWS
2 3 4
20 (6) 15 (4.2) 10 (3)
17 (5.1) 12 (3.6) 7 (2.1)
13 (3.9) 8 (2.4)
10 (3) 5 (1.5)
6 (1.8)
6
20
(6.1)
47
(14.3)
29
(8.8)
NA
47
(14.3)
NA
29
(8.8)
29
(8.8)
NA
5