Riello RS 45 BLU Installation, Use And Maintenance Instructions page 23

Column 1 - 2
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 24), with:
• combustion chamber at 0 mbar;
• burner working at maximum output
To calculate the approximate output at which the burner operates
in the 2nd stage:
– subtract the combustion chamber pressure from the gas
pressure measured at test point 1)(Fig. 24).
– Find in related to the burner concerned, the pressure value
closest to the result of the subtraction.
– Read the corresponding output on the left.
Example - RS 45 BLU:
Maximum output operation
Natural gas G 20 NCV 9.45 kWh/Sm
Gas pressure at test point 1)(Fig. 24)
Pressure in combustion chamber
12.1 - 2.0
A pressure of 10.1 mbar, column 1, corresponds in table
RS 45 BLU to output of 450 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. 24),
set the maximum modulating output required from the burner
operation:
– find the nearest output value in the table for the burner in
question.
– read, on the right (column 1), the pressure at the test point 1)
(Fig. 24).
– Add this value to the estimated pressure in combustion
chamber.
Example - RS 45 BLU:
Required burner maximum output operation: 450 kW
Natural gas G 20 NCV 9.45 kWh/Sm
Gas pressure at an output of 450 kW
Pressure in combustion chamber
10.1 + 2.0
pressure required at test point 1)(Fig. 24).
Installation
3
= 12.1 mbar
= 2.0 mbar
= 10.1 mbar
3
= 10.1 mbar
= 2.0 mbar
= 12.1 mbar
21 GB
1
S9525
Fig. 24
20191684