Riello RS 45/M C05 Installation, Use And Maintenance Instructions page 21

Column 1
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 23), with:
• combustion chamber at 0 mbar;
• adjustments indicated on page 16.
Column 2
• Pressure loss at gas butterfly valve 2)(Fig. 23) with maximum
opening: 90°.
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. 23).
– 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/M C05:
Maximum output operation
Natural gas G 20 NCV 9.45 kWh/Sm
Gas pressure at test point 1)(Fig. 23)
Pressure in combustion chamber
17.0 - 2.0
A pressure of 15.0 mbar, column 1, corresponds in Tab. F to
output of 463 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. 23),
set the maximum modulating output required from the burner
operation:
– find the nearest output value in the Tab. F for the burner in
question.
– read, on the right (column 1), the pressure at the test point 1)
(Fig. 23).
– Add this value to the estimated pressure in combustion
chamber.
Example - RS 45/M C05:
Required burner maximum output operation: 463 kW
Natural gas G 20 NCV 9.45 kWh/Sm
Gas pressure at an output of 463 kW
Pressure in combustion chamber
15.0 + 2.0
pressure required at test point 1)(Fig. 23).
Installation
3
= 17.0 mbar
= 2.0 mbar
= 15.0 mbar
3
= 15.0 mbar
= 2.0 mbar
= 17.0 mbar
19 GB
1
S8738
2
Fig. 23
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