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PRESSURE WORKING CHART
The chart below shows effects of pressure in the combustion zone on the minimum/maximum burner outputs. In this
example, with a maximum operating pressure of 0.08 inches water column in the combustion zone, you will be able to
obtain a maximum of 120,000 Btu/h burner output.
Pressure
In/wc M/bar
0.32
0.8
0.24
0.6
0.16
0.4
0.08
0.2
0.0
0.0
D7409
Any change from zero (0) pressure in the combustion zone will affect the Btu output of the burner. To supply the
required input to the appliance, manifold pressure will have to be adjusted to compensate for this condition.
COMBUSTION CHAMBER SIZE
Length
cm
In
40
16
35
14
30
12
25
10
20
8
15
6
0
D7410
0
NOTES:
1) Sizes shown above are for cylindrical or wet base boilers, or air cooled heat exchangers.
2) To size the chamber in applications other than wet base boilers, refer to the authority having jurisdiction.
Refer to CAN/CGA B149.1 &. 2, ANSI Z21.8-1984, and ANSI Z223-1-1984.
3) Fire brick or cerafelt chamber materials should have a continuous run temperature rating of 2400 degrees Fahren-
heit and a melting point of 3000 degrees Fahrenheit.
PRESSURE WORKING CHART
Natural and Propane Gas
10
15
38,000
65,000
COMBUSTION CHAMBER SIZE
Recommended Minimum Sizes
20,000
40,000
60,000
5
10
15
20
25
93,000
80,000
100,000
20
25
13
GB
kW/h
30
35
120,000
Btu/h
Diameter = 11 inches
= 280 mm
120,000
Btu/h
Kcal/h
30
2903332
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