Pressure Working Chart; Combustion Chamber Size - Riello 40 Installation, Use And Maintenance Instructions

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.
Pressure
In/wc M/bar
0.40 1.0
0.32 0.8
0.24 0.6
0.16 0.4
0.08 0.2
0.0 0.0
D7411
34,000
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 Fahren-
heit and a melting point of 3000 degrees Fahrenheit.
PRESSURE WORKING CHART
10 20
68,000 102,000
Natural and Propane Gas
30 40
137,000 171,000
13 GB
kW/h
50 60
Btu/h
205,000
2903333