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(A)
(B)
Diameter (inches)
FIRING RATE (A)
The RL 28/2 - 38/2 - 50/2 Model burners are available
in low-high firing configuration.
LOW FIRE DELIVERY must be selected within area A
of the adjacent diagrams.
HIGH FIRE DELIVERY must be selected within area B.
This area provides the maximum delivery of the burner
in relation to the pressure in the combustion chamber.
The firing rate may be found by plotting a vertical line
from the desired delivery and a horizontal line from
the pressure in the combustion chamber. The inter-
section of these two lines is the firing rate which must
lie within area B.
Important:
the FIRING RATE area values have been obtained
considering a surrounding temperature of 68 °F (20
°C), and an atmospheric pressure of 394" WC above
sea level and with the combustion head adjusted as
shown on page 7.
Note:
The FIRING RATE areas given in figure (A) have been
reduced by 10% with respect to the maximum range that
can be reached.
Consult Appendix on page 20 for operation at different
surrounding temperatures and/or altitudes.
MINIMUM FURNACE DIMENSIONS (B)
The firing rates were set in relation to certified test boil-
ers.
Figure (B) indicates the diameter and length of the test
combustion chamber.
Example:
output 1388 MBtu/hr:
diameter 20 inch - length 4.9 ft.
D2279
D2918
5
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