Carrier 58SMA Operating Instructions Manual page 26

Table 4—Maximum Allowable Vent Pipe Length (Ft)
ALTITUDE UNIT SIZE
040-08
040-12
060-08
036060
060-16
5001 to 6000† 080-12
080-16
080-20
100-16
100-20
120-20
ALTITUDE UNIT SIZE
040-08
040-12
060-08
036060
060-16
6001 to 7000† 080-12
080-16
080-20
100-16
100-20
120-20
ALTITUDE UNIT SIZE
040-08
040-12
060-08
036060
060-16
7001 to 8000† 080-12
080-16
080-20
100-16
100-20
120-20
ALTITUDE UNIT SIZE
040-08
040-12
060-08
036060
060-16
8001 to 9000† 080-12
080-16
080-20
100-16
100-20
120-20
* 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.
VENT PIPE
DIAMETER (IN.)
1
1-1/2 57
2 70
1-1/2 14
2 60
2 41
2-1/2 70
2-1/2 29
3 70
3* 53
VENT PIPE
DIAMETER (IN.)
1
1-1/2 53
2 70
1-1/2 13
2 57
2 38
2-1/2 70
2-1/2 27
3 68
3* 49
VENT PIPE
DIAMETER (IN.)
1
1-1/2 49
2 66
1-1/2 12
2 53
2 36
2-1/2 66
2-1/2 25
3 63
3* 46
VENT PIPE
DIAMETER (IN.)
1
1-1/2 46
2 62
1-1/2 11
2 49
2 33
2-1/2 62
2-1/2 23
3 59
3* 43
26
Continued
NUMBER OF 90° ELBOWS
2 3 4
52 47 42
70 70 70
9 NA NA
55 54 49
36 23 18
70 70 70
21 12 11
67 62 57
52 50 49
NUMBER OF 90° ELBOWS
2 3 4
48 43 38
70 68 67
8 NA NA
52 50 45
33 21 16
70 68 67
19 10 9
63 58 53
48 47 45
NUMBER OF 90° ELBOWS
2 3 4
44 39 34
65 63 62
7 NA NA
48 46 41
31 19 14
65 63 62
17 8 7
58 53 48
44 43 41
NUMBER OF 90° ELBOWS
2 3 4
41 36 31
60 58 56
6 NA NA
44 42 37
28 17 12
60 58 56
15 7 5
54 49 44
41 39 37
5 6
40 35
70 70
NA NA
48 47
17 8
70 70
NA NA
52 47
48 47
5 6
37 32
66 64
NA NA
44 43
15 6
66 64
NA NA
48 43
44 43
5 6
33 28
60 59
NA NA
40 38
12 NA
60 59
NA NA
43 38
40 38
5 6
29 24
55 53
NA NA
35 34
10 NA
55 53
NA NA
39 34
35 34