7219840.02 (1-03/16)
48
INST
ALLER Section
(en)
17. COMBUSTION PARAMETERS
To measure combustion efficiency and the toxicity of the products of combustion, the boiler is
fitted with two dedicated test points. One connection point is connected to the flue gas discharge
circuit (
A
), and allows monitoring of the quality of the combustion products and the combustion
efficiency. The other is connected to the combustion air intake circuit (
B
), allowing checking of any
recycling of the combustion products in case of coaxial pipelines. The following parameters can
be measured at the connection point on the flue gas circuit:
• temperature of the combustion products;
•
oxygen (
) or carbon dioxide (
) concentration;
• carbon monoxide (
) concentration.
The temperature of the comburent air must be measured on the test point located on the air intake flue (
B
) by inserting the
measurement sensor by about 8 cm (
C
).
To enable the "
Chimney sweeper
" function consult section 15.
17.1 COMBUSTION TEST (CO
2
)
For correct boiler operation, the content of
(CO
2
- O
2
)
in the combustion fumes must observe the tolerances indicated in the
following table. If the value of
(CO
2
- O
2
)
is different, check the electrodes and their relative distances (chapter POSITIONING THE
ELECTRODES). If necessary, replace the electrodes and position them correctly.
G20
G31
CO
2
%
O
2
%
CO
2
%
O
2
%
Nominal value
8,7
5,4
10
5,7
Permitted value
8,0 - 9,4
6,6 – 4,1
9,3 – 10,7
6,7 – 4,6
The combustions analisys shall be done using an analyzer regularly calibrated.
During normal operation the boiler performs combustion control cycles. In this phase, CO values higher than 1000 ppm can
occur for brief periods of time.
IMPORTANT
During initial ignition or after replacing the flame sensing electrode, consult the following table to check the correct amount of O
2
and CO
2
.
G20
G31
CO
2
%
O
2
%
CO
2
%
O
2
%
Nominal value
Qmax
8,5
5,7
9,5
6,4
Qmin
8,0
6,6
9,0
7,2
Permitted value
Qmax
7,8 – 9,2
7,0 – 4,5
8,8 – 10,2
7,5 – 5,4
Qmin
7,3 – 8,7
7,9 – 5,4
8,3 – 9,7
8,3 – 6,1
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