Venting Tables - A.O. Smith HW 300 Installation & Operation Manual

TABLE 5, COMBINED VENT SIZING TABLES
MODEL HW-300 BOILER
Input: 300,000 Btuh
Required Connector or Smoke Pipe Diameter
Total Vent Height (Measured in Feet Above Draft Hood)
Connector
10
Rise in Feet
1 10
2 10
3 10
4 or more
Total Vent Height (Measured in Feet Above Draft Hood)
Number
Total Input
if Units 10
Btuh x 1000
Combined
2 600 14
3 900 16
4 1200 18
MODEL HW-399 BOILER
Input: 399,000 Btuh
Required Connector or Smoke Pipe Diameter
Total Vent Height (Measured in Feet Above Draft Hood)
Connector
10
Rise in Feet
1 12
2 12
3 12
4 or more 10
Total Vent Height (Measured in Feet Above Draft Hood)
Number
Total Input
if Units 10
Btuh x 1000
Combined
2 798 14
3 1197 18
4 1596 20
MODEL HW-420 BOILER
Input: 420,000 Btuh
Required Connector or Smoke Pipe Diameter
Total Vent Height (Measured in Feet Above Draft Hood)
Connector
10
Rise in Feet
1 12
2 12
3 12
4 or more 10
Total Vent Height (Measured in Feet Above Draft Hood)
Number
Total Input
if Units 10
Btuh x 1000
Combined
2 840 14
3 1260 18
4 1680 20
MODEL HW-520 BOILER
Input: 520,000 Btuh
Required Connector or Smoke Pipe Diameter
Total Vent Height (Measured in Feet Above Draft Hood)
Connector
10
Rise in Feet
1 14
2 12
3 12
4 or more 12
Total Vent Height (Measured in Feet Above Draft Hood)
Number
Total Input
if Units 10
Btuh x 1000
Combined
2 1040 16
3 1560 20
4 2080 22
5 2600 26
6 3120 28
7 3640 30
8 4160 32
Draft Hood Outlet 8"
15 20 30 40 50 60
Connector Diameter (in Inches)
10 10 10 10 10 10
10 10 10 10 10 10
10 10 10 10 10 10
15 20 30 40 50 60
Manifold and Common Vent Diameter (in Inches)
12 12 12 10 10 10
14 14 14 12 12 12
16 16 14 14 14 14
Draft Hood Outlet 10"
15 20 30 40 50 60
Connector Diameter (in Inches)
12 12 12 12 12 12
12 12 10 10 10 10
10 10 10 10 10 10
10 10 10 10 10 10
15 20 30 40 50 60
Manifold and Common Vent Diameter (in Inches)
14 14 12 12 12 12
16 16 14 14 14 14
20 18 16 16 16 14
Draft Hood Outlet 10"
15 20 30 40 50 60
Connector Diameter (in Inches)
12 12 12 12 12 12
12 12 10 10 10 10
10 10 10 10 10 10
10 10 10 10 10 10
15 20 30 40 50 60
Manifold and Common Vent Diameter (in Inches)
14 14 12 12 12 12
16 16 14 14 14 14
20 18 16 16 16 14
Draft Hood Outlet 10"
15 20 30 40 50 60
Connector Diameter (in Inches)
14 14 12 12 12 12
12 12 12 12 12 12
12 12 12 10 10 10
12 12 12 10 10 10
15 20 30 40 50 60
Manifold and Common Vent Diameter (in Inches)
16 14 14 14 14 12
18 18 16 16 14 14
22 20 18 18 18 16
24 22 20 20 18 18
26 24 22 22 20 20
28 26 24 24 22 22
30 28 26 24 24 22
Input: 610,000 Btuh
Connector
80 100
Rise in Feet
1
10 10
2
10 10
3
10 10
4 or more
Number
Total Input
if Units
80 100
Btuh x 1000
Combined
2 1220
10 10
3 1830
12 12
4 2440
12 12
5 3050
6 3660
7 4270
8 4880
9 5490
10 6100
11 6710
80 100
12 7320
12 12
10 10
10 10
Input: 660,000 or 670,000 Btuh
10 10
80 100
Connector
Rise in Feet
12 12
1
14 12
2
14 14
3
4 or more
Number
Total Input
if Units
Btuh x 1000
Combined
2 1220
3 1830
80 100
4 2440
5 3050
12 12
6 3660
10 10
7 4270
10 10
8 4880
10 10
9 5490
10 6100
80 100
11 6710
12 7320
12 12
14 12
14 14
Known: (5) model HW-610 boilers. (See illustration).
Connector rise - 2' (Note 1' is minimum). Total vent
height 30'.
80 100
Problem: Determine diameter of connector, manifold and
12 12
common vent.
12 12
10 10
Procedure: Enter the top of the HW-610 table (total vent height)
10 10
at 30' and the side at 2' (connector rise). A 14"
80 100
connector diameter is indicated for each connector
rise.
12 12
14 14
16 14
To determine the manifold and common vent size, enter table on this
18 18
18 18 page (total vent height) at 30 and the side at 5 boilers. A manifold
20 20
diameter of 24" (610 mm) is indicated.
22 20
17
MODEL HW-610 BOILER
Draft Hood Outlet 12"
Required Connector or Smoke Pipe Diameter
Total Vent Height (Measured in Feet Above Draft Hood)
10 15 20 30 40
Connector Diameter (in Inches)
16 14 14 14 14
14 14 14 14 14
14 14 12 12 12
12 12 12 12 12
Total Vent Height (Measured in Feet Above Draft Hood)
10 15 20 30 40
Manifold and Common Vent Diameter (in Inches)
18 18 16 16 14
22 20 20 18 18
26 24 22 20 20
28 26 26 24 22
32 28 28 26 24
34 32 30 28 26
36 34 32 30 28
38 36 34 30 30
40 38 36 32 30
42 38 38 34 32
44 42 38 36 34
MODEL HW-670 BOILER
Draft Hood Outlet 12"
Required Connector or Smoke Pipe Diameter
Total Vent Height (Measured in Feet Above Draft Hood)
10 15 20 30 40
Connector Diameter (in Inches)
16 14 14 14 14
14 14 14 14 14
14 14 12 12 12
12 12 12 12 12
Total Vent Height (Measured in Feet Above Draft Hood)
10 15 20 30 40
Manifold and Common Vent Diameter (in Inches)
18 18 16 16 14
22 20 20 18 18
26 24 22 20 20
28 26 26 24 22
32 28 28 26 24
34 32 30 28 26
36 34 32 30 28
38 36 34 30 30
40 38 36 32 30
42 38 38 34 32
46 44 40 38 36
50 60 80 100
14 14 14 14
12 12 12 12
12 12 12 12
12 12 12 12
50 60 80 100
14 14 14 14
16 16 16 14
18 18 18 16
22 20 20 18
24 22 22 20
24 24 22 22
26 26 24 24
28 28 26 24
30 28 26 26
30 28 28 26
32 32 30 28
50 60 80 100
14 14 14 14
12 12 12 12
12 12 12 12
12 12 12 12
50 60 80 100
14 14 14 14
16 16 16 14
18 18 18 16
22 20 20 18
24 22 22 20
24 24 22 22
26 26 24 24
28 28 26 24
30 28 26 26
30 28 28 26
34 34 32 30