912SD: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
43
A11335
HORIZONTAL RIGHT-RIGHT VENT CONFIGURATION
Fig. 57 – Horizontal Right (Appearance may vary)
See “Notes for Venting Options”
NOTES FOR VENTING OPTIONS
1. Attach vent pipe adapter with gasket to furnace casing.
2. Align notches in rubber coupling over standoffs on adapter. Slide
clamps over the coupling.
3. Slide vent pipe through adapter and coupling into vent elbow.
4. Insert vent pipe into vent elbow.
5. Torque all clamps 15 lb.-in.
6. Attach combustion air pipe adapter with gasket to furnace.
7. Attach combustion air pipe to adapter with silicone. Pilot drill
a
1/8
-in. hole in adapter and secure with a #7 x
1/2
-in. sheet metal
screw.
Table 15 – Maximum Allowable Exposed Vent Lengths in Unconditioned Space Table - Ft.
Maximum Allowable Exposed Vent Length in Unconditioned Space (Metric)
ALTERNATE
COMBUSTION
AIR CONNECTIONS
Winter
Design
Temp
°F
Unit Size
40,000* BTUH
60,000 BTUH
Uninsulated
3/8-in.
Insulation
1/2-in.
Insulation
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia. in. 1 ½
2
2 ½ 1 ½
2
2 ½ 1 ½
2
2 ½
1 ½
2
2 ½ 3
1 ½
2
2 ½
3
1 ½
2
2 ½ 3
20
20
20
20
20
50
45
20
60
50 20
30
30
25
20
75
65
60
20
85
75
65
0
10
5
5
20
25
20
20
30
25 15
15
10
10
20
40
30
25
20
45
40
30
-20
5
20
15
10
20
20
15 10
5
20
25
20
15
20
30
25
20
-40
15
10
5
15
15
10 5
20
15
15
10
20
20
15
10
Winter
Design
Temp
°F
Unit Size
80,000 BTUH
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia. in.
1 ½
2
2 ½
3
4
1 ½
2
2 ½
3
4
1 ½
2
2 ½
3
4
20
15
40
40
35
30
15
50
90
75
65
15
50
70
70
70
0
15
20
15
10
5
15
50
45
35
30
15
50
50
40
35
-20
15
10
5
15
35
30
20
15
15
40
30
25
15
-40
10
5
15
25
20
15
5
15
30
25
20
10
Winter
Design
Temp
°F
Unit Size
100,000 BTUH
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia. in.
2
2 ½
3
4
2
2 ½
3
4
2
2 ½
3
4
20
20
50
40
35
20
80
95
80
20
80
105
90
0
20
20
15
10
20
55
45
35
20
65
55
45
-20
15
10
5
20
35
30
20
20
45
35
25
-40
10
5
20
25
20
10
20
30
25
15
Winter
Design
Temp
°F
Unit Size
120,000 BTUH
140,000 BTUH
Uninsulated
3/8-in. Insulation 1/2-in. Insulation
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia. in. 2 ½
3
4
2 ½
3
4
2 ½
3
4
2 ½
3
4
2 ½
3
4
2 ½
3
4
20
10
50
40
10
75
95
10
75
105
5
55
50
5
65
105
5
65
125
0
10
20
15
10
55
45
10
65
50
5
25
15
5
65
50
5
65
60
-20
10
10
10
35
25
10
45
30
5
10
5
5
45
30
5
50
40
-40
10
5
10
25
15
10
30
20
5
5
5
30
20
5
35
25
Winter
Design
Temp
°C
Unit Size
40,000* BTUH
60,000 BTUH
Uninsulated
3/8-in.
Insulation
1/2-in.
Insulation
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia.
mm
38
51
64 38
51
64 38
51
64
38
51
64 76
38
51
64 76
38 51
64 76
-7
6.1 6.1 6.1 6.1 15.2 13.7 6.1 18.3 15.2
6.1 9.1 9.1 7.6 6.1 22.9 19.8 18.3 6.1 25.9 22.9 19.8
-18
3.0 1.5 1.5 6.1 7.6 6.1 6.1 9.1 7.6
4.6 4.6 3.0 3.0 6.1 12.2 9.1 7.6 6.1 13.7 12.2 9.1
-29
1.5
6.1 4.6 3.0 6.1 6.1 4.6
3.0 1.5
6.1 7.6 6.1 4.6 6.1 9.1 7.6 6.1
-40
4.6 3.0 1.5 4.6 4.6 3.0
1.5
6.1 4.6 4.6 3.0 6.1 6.1 4.6 3.0
