Firing Rates; Minimum Furnace Dimensions - Riello RL 70/M Installation, Use And Maintenance Instructions

(A)
(B)
Diameter (inches)
FIRING RATES (A)
During operation, burner output varies between:
• MINIMUM OUTPUT: area A;
• MAXIMUM OUTPUT: area B (and C for model RL 130/
M).
Graphs (A):
Horizontal axis
Vertical axis
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 intersection of
these two lines is the firing rate which must lie within
area A, for MIN output, and within area B, for MAX out-
put.
In order to utilize also area C (RL 130/M) it is necessary
to perform the calibration of the combustion head as
explained on page 6.
Note:
The FIRING RATE areas given in figure (A) have been
reduced by 10% with respect to the maximum range that
can be reached.
Important:
The FIRING RATE area values have been obtained con-
sidering an ambient temperature of 68 °F (20°C), and an
atmospheric pressure of 394" WC and with the combus-
tion head adjusted as shown on page 7.
Consult Procedure on page 15 to refer burner operating
condition in high altitude plants.
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 2579 MBtu/hr:
diameter 24 inch - length 6.6 ft.
D2350
D2919
5
: Burner output
: Combustion chamber pressure