HP (Hewlett-Packard) 422690 I Furnace User Manual


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Page 8 Installer’s Information Manual
Table 1. Maximum Pipe Length--Direct Vent
ALLOWABLE PIPE LENGTH (feet of each pipe)
ALTITUDE FURNACE PIPE
NUMBER OF SWEEP ELBOWS (each pipe) (SEE NOTE 1)
INPUT DIA. 1 2 3 4 5 6 7 8
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
40
40
37
33
30
27
23
20
72,000
3"
40
40
40
40
40
40
40
40
0'
-
1000'
90,000
2"
30
26
22
19
15
11
-
-
90,000
3"
40
40
40
40
40
40
40
40
108,000
3"
40
40
40
40
40
40
40
40
126,000
3"
40
40
40
40
35
30
25
20
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
40
37
33
29
25
21
19
15
72,000
3"
40
40
40
40
40
40
40
40
1001'
-
2000'
90,000
2"
25
22
19
16
12
-
-
-
90,000
3"
40
40
40
40
40
40
40
40
108,000
3"
40
4
0
40
40
40
40
40
40
126,000
3"
40
38
33
28
22
16
11
-
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
35
33
29
25
21
17
13
-
72,000
3"
40
40
40
40
40
40
40
40
2001'
-
3000'
90,000
2"
22
19
16
14
-
-
-
-
90,000
3"
40
40
40
40
40
40
40
40
1
08,000
3"
40
40
40
40
40
40
40
40
126,000
3"
35
30
25
20
15
10
-
-
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
30
28
26
24
22
20
18
17
72,000
3"
40
40
40
40
40
40
40
40
3001'
-
4000'
90,000
2"
15
13
11
-
-
-
-
-
90,000
3"
40
40
40
40
40
40
4
0
40
108,000
3"
40
40
40
40
40
40
40
40
126,000
3"
30
25
20
15
10
-
-
-
126,000
3"
40
40
40
40
35
30
25
20
See Note 2 below.
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
26
22
17
14
12
-
-
-
72,000
3"
40
40
40
40
40
40
40
40
4001'
-
5000'
9
0,000
3"
40
40
40
40
40
40
40
40
108,000
3"
40
40
40
35
30
25
20
15
108,000
3"
40
40
40
40
40
40
40
40
See Note 2 below.
126,000
3"
40
40
40
40
35
30
25
20
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
21
18
14
11
-
-
-
-
72,000
3"
40
40
40
40
40
40
40
40
5001'
-
6000'
90,000
3"
40
40
40
40
40
40
40
40
108,000
3"
40
35
30
25
20
15
10
-
108,000
3"
40
40
40
40
40
40
40
40
See Note 2 below.
126,000
3"
40
40
40
40
35
30
25
20
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
40
40
40
40
3
6
32
28
24
72,000
3"
40
40
40
40
40
40
40
40
6001'
-
7000'
90,000
3"
40
40
40
40
40
40
40
40
See Note 2 below.
108,000
3"
40
40
40
40
40
40
40
40
126,000
3"
40
40
40
40
35
30
25
20
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
40
40
40
37
35
32
28
24
72,000
3"
40
40
40
40
40
40
40
40
7001'
-
8000'
90,000
3"
40
40
40
40
40
40
40
40
See Note 2 below.
108,000
3"
40
40
40
40
40
40
40
40
126,000
3"
40
40
40
40
35
30
25
20
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
40
40
37
34
31
28
24
21
72,000
3"
40
40
40
40
40
40
40
40
8001'
-
9000'
90,000
3"
40
40
40
40
40
40
40
40
See Note 2 below.
108,000
3"
40
40
40
40
40
40
40
40
126,000
3"
40
40
40
35
30
25
20
15
54,000
2"
40
40
40
40
40
40
40
40
72,000
2"
40
37
35
31
27
24
21
18
72,000
3"
40
40
40
40
40
40
40
40
9001'
-
10000'
90,000
3"
40
40
40
40
40
40
40
40
See Note 2 below.
108,000
3"
40
40
40
40
40
40
40
40
126,000
3"
40
35
30
25
20
15
-
-
NOTE 1: The table assumes the use of sweep elbows. If using hard 90? elbows, the vent length should be decreased an
additional 3 feet for every elbow used.
NOTE 2: The shaded portions of the table require the high altitude pressure switch in order to operate the furnace at the listed
vent lengths.
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