Riello DB 4 LSM C13 Installation, Use And Maintenance Instructions page 64

Example with natural gas G20:
Operation at maximum modulating output
Gas pressure at test point 1)(Fig. 27)
Pressure in combustion chamber
21.7 - 5
A pressure of 16.7 mbar (column 1) corresponds in Tab. J to an
output of 3500 kW.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
To calculate the required gas pressure at test point 1) (Fig. 27),
set the maximum modulating output required from the burner op-
eration:
– find the nearest output value in Tab. J for the burner in ques-
tion.
– read, on the right (column 1), the pressure at the test point 1)
(Fig. 27).
– Add this value to the estimated pressure in combustion
chamber.
Example with natural gas G20:
Operation at maximum modulating output
Gas pressure at an output of 3500 kW
Pressure in combustion chamber
16.7 + 5
pressure required at test point 1)(Fig. 27).
20146011
Installation
= 21.7 mbar
= 5 mbar
= 16.7 mbar
= 16.7 mbar
= 5 mbar
= 21.7 mbar
24 GB