3254
13
GB
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 0.16 inches water column in the combustion zone, you will be
able to obtain a maximum of 165,500 Btu/h burner output.
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.
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 Fahr-
enheit and a melting point of 3000 degrees Fahrenheit.
PRESSURE WORKING CHART
Natural and Propane Gas
Pressure
In/wc M/bar
Btu/h
kW/h
0.32
0.24
0.16
0.08
0.0
0.8
0.6
0.4
0.2
0.0
10 20 30 40
34,000 68,000 137,000 171,000
D7411
0.40 1.0
102,000 205,000
6050
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