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21
20098687
GB
Installation
Example with G 20 natural gas:
Maximum output operation
Gas pressure at test point 1)(Fig. 21)
=
9.5 mbar
Pressure in combustion chamber
=
2.0 mbar
9.5 - 2.0
=
7.5 mbar
A pressure of 7.5 mbar, column 1, corresponds in Tab. H to an
output of 400 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. 21),
set the maximum modulating output required from the burner op-
eration:
–
find the nearest output value in Tab. H for the burner in ques-
tion.
–
read, on the right (column 1), the pressure at the test point 1)
(Fig. 21).
–
Add this value to the estimated pressure in combustion
chamber.
Example with G 20 natural gas:
Operating at the desired maximum output: 400 kW
Gas pressure at an output of 400 kW
=
7.5 mbar
Pressure in combustion chamber
=
2.0 mbar
7.5 + 2.0
=
9.5 mbar
pressure required at test point 1)(Fig. 21).
2
1
Fig. 21
S8738
Summary of Contents for 3897304
Page 2: ...Translation of the original instructions ...
Page 47: ......