Payne PG9MAB Series A Installation Manual page 42

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UNIT SIZE
ALTITUDE (FT)
(BTUH)
40,000
60,000
80,000
7001 to 8000‡
100,000
120,000
140,000
UNIT SIZE
ALTITUDE (FT)
(BTUH)
40,000
60,000
80,000
8001 to 9000‡
100,000
120,000
140,000
UNIT SIZE
ALTITUDE (FT)
(BTUH)
40,000
60,000
80,000
9001 to 10,000‡
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. Long 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 for all applications.
6. Use 3-in. diameter vent termination kit for installations requiring 4-in diameter pipe.
Table 11—Maximum Allowable Vent Pipe Length (Ft) (Continued)
DIRECT VENT (2-PIPE) ONLY
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
DIRECT VENT (2-PIPE) ONLY
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
DIRECT VENT (2-PIPE) ONLY
TERMINATION PIPE DIA
TYPE (IN.)*
1-1/2
2 Pipe or 2-in
Concentric
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.
Concentric
4† no disk
NON-DIRECT VENT
(1-PIPE) ONLY
PIPE DIA
(IN.)*
1-1/2
2 2
1-1/2
2 2
2 2
2-1/2
2-1/2
3 3
NA
NA 3†
4† no disk
NA
NON-DIRECT VENT
(1-PIPE) ONLY
PIPE DIA
(IN.)*
1-1/2
2 2
1-1/2
2 2
2 2
2-1/2
2-1/2
3 3
NA
NA 3†
4† no disk
NA
NON-DIRECT VENT
(1-PIPE) ONLY
PIPE DIA
(IN.)*
1-1/2
2 2
2 2
2 2
2-1/2
2-1/2
3 3
NA 3†
4† no disk
NA
—42—
NUMBER OF 90° ELBOWS
1 2 3 4
49 44 39 34
66 65 63 62
12 7 NA NA
53 48 46 41
36 31 19 14
66 65 63 62
25 17 8 7
63 58 53 48
20 13 7 NA
46 44 43 41
61 56 51 46
NUMBER OF 90° ELBOWS
1 2 3 4
46 41 36 31
62 60 58 56
11 6 NA NA
49 44 42 37
33 28 17 12
62 60 58 56
23 15 7 5
59 54 49 44
10 NA NA NA
43 41 39 37
35 30 25 20
NUMBER OF 90° ELBOWS
1 2 3 4
42 37 32 27
57 55 53 51
45 40 38 33
30 25 14 9
57 55 53 51
21 13 5 NA
54 49 44 39
39 37 35 33
10 5 NA NA
5 6
33 28
60 59
NA NA
40 38
12 NA
60 59
NA NA
43 38
NA NA
40 38
41 36
5 6
29 24
55 53
NA NA
35 34
10 NA
55 53
NA NA
39 34
NA NA
35 34
15 10
5 6
25 20
49 47
31 29
7 NA
49 47
NA NA
34 29
31 29
NA NA