Riello RS 200/M BLU Installation, Use And Maintenance Instructions page 27

To calculate the approximate output at which the burner
operates:
– subtract the combustion chamber pressure from the gas
pressure measured at test point 1)(Fig. 25).
– Find in Tab. L related to the burner concerned, the pressure
value closest to the result of the subtraction.
– Read the corresponding output on the left.
Example with natural gas G 20 for:
Maximum output operation
Gas pressure at test point 1)(Fig. 25)
Pressure in combustion chamber
17.7 - 3.0
A pressure of 14.7 mbar, column 1, corresponds in Tab. L to an
output of 1800 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. 25),
set the maximum modulating output required from the burner
operation:
– find the nearest output value in Tab. L for the burner in
question.
– Read, on the right (column 1), the pressure at the test point
1)(Fig. 25).
– Add this value to the estimated pressure in combustion
chamber.
Example with natural gas G 20 for:
Operating at the desired maximum output: 1800 kW
Gas pressure at an output of 1800 kW
Pressure in combustion chamber
14.7 + 3.0
pressure required at test point 1)(Fig. 25).
Installation
= 17.7 mbar
= 3.0 mbar
= 14.7 mbar
= 14.7 mbar
= 3.0 mbar
= 17.7 mbar
25 GB
20057327
Fig. 25
20152093