Carrier 58MSA Installation, Start-Up, And Operating Instructions Manual page 26

ALTITUDE (FT) UNIT SIZE
0 to 2000
ALTITUDE (FT) UNIT SIZE
2001 to 3000
ALTITUDE (FT) UNIT SIZE
3001 to 4000
ALTITUDE (FT) UNIT SIZE
4001 to 5000†
* 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. Assume two 45° elbows equal one 90° elbow. Long radius elbows are desirable and may be required in some cases.
3. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
4. The minimum pipe length is 5 ft for all applications.
Table 4—Maximum Allowable Vent Pipe Length (Ft)
VENT PIPE
DIAMETER (IN.)
1
040-08
1-1/2
040-12
2
1-1/2
060-08
060-16
2
1-1/2
080-12
080-16 2
080-20
2-1/2
2
100-16
2-1/2
100-20
3
2-1/2
120-20
3*
VENT PIPE
DIAMETER (IN.)
1-1/2
040-08
040-12
2
1-1/2
060-08
060-16
2
080-12
2
080-16
2-1/2
080-20
2-1/2
100-16
100-20
3
120-20 3*
VENT PIPE
DIAMETER (IN.)
1-1/2
040-08
040-12
2
1-1/2
060-08
060-16
2
080-12
2
080-16
2-1/2
080-20
2-1/2
100-16
100-20
3
120-20 3*
VENT PIPE
DIAMETER (IN.)
1-1/2
040-08
040-12
2
1-1/2
060-08
060-16
2
080-12
2
080-16
2-1/2
080-20
2-1/2
100-16
100-20
3
120-20 3*
NUMBER OF 90° ELBOWS
1 2 3
5 NA NA
70 70 65
70 70 70
20 15 10
70 70 70
10 NA NA
55 50 35
70 70 70
5 NA NA
40 30 20
70 70 70
10 NA NA
70 70 70
NUMBER OF 90° ELBOWS
1 2 3
67 62 57
70 70 70
17 12 7
70 67 66
49 44 30
70 70 70
35 26 16
70 70 70
63 62 62
NUMBER OF 90° ELBOWS
1 2 3
64 59 54
70 70 70
16 11 6
68 63 62
46 41 28
70 70 70
33 24 15
70 70 70
59 59 58
NUMBER OF 90° ELBOWS
1 2 3
60 55 50
70 70 70
15 10 5
64 59 58
44 39 26
70 70 70
31 22 13
70 70 67
56 55 54
26
4 5 6
NA NA NA
60 60 55
70 70 70
5 NA NA
70 70 70
NA NA NA
30 30 20
70 70 70
NA NA NA
20 10 NA
70 70 70
NA NA NA
70 70 70
4 5 6
52 52 47
70 70 70
NA NA NA
61 61 61
25 25 15
70 70 70
16 6 NA
70 66 61
61 61 61
4 5 6
49 48 43
70 70 70
NA NA NA
57 57 56
23 22 13
70 70 70
14 5 NA
66 61 56
57 57 56
4 5 6
45 44 39
70 70 70
NA NA NA
53 52 52
21 20 11
70 70 70
12 NA NA
62 57 52
53 52 52