Riello G400 - Pressure Working Chart; Combustion Chamber Size

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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 0.6 inches water column in the combustion zone, you will be able to
obtain a maximum of 370,000 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.
COMBUSTION CHAMBER SIZE
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
Pressure
In/wc
Btu/h
kW/h
2.0
1.0
0.0
49.8 108.461.5 73.8 85.0 96.7
410,000
3.0
4.0
370,000330,000290,000250,000210,000170,000
120.1
COMBUSTION CHAMBER SIZE
Recommended Minimum Sizes
Length
26
22
18
14
10
30
Inches
Btu/h400,000350,000300,000250,000200,000150,000
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