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C607215 - GB
INSTRUCTIONS FOR FITTERS
23. POSITIONING THE IGNITION AND FLAME-SENSING ELECTRODE
Figure 14
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To measure combustion efficiency and the toxicity of the products of combustion, the boiler is fitted with two dedicated test points.
One test point is connected to the exhaust duct and is used to measure combustion efficiency and the toxicity of the products of com-
bustion.
The other is connected to the air intake duct and is used to check for the presence of any products of combustion circulating in instal-
lations with co-axial flues.
The following parameters can be measured using the test point connected to the exhaust duct:
• temperature of the products of combustion;
• concentration of oxygen (O2) or, alternatively, carbon dioxide (CO2);
• concentration of carbon monoxide (CO).
The temperature of the comburent air must be measured on the test point located on the air intake flue by inserting the measurement
sensor by about 3 cm.
For natural draught boiler models, a hole must be made in the exhaust duct at a distance from the boiler equal to twice the internal
diameter of the flue. The following parameters can be measured inside this hole:
• temperature of the products of combustion;
• concentration of oxygen (O2) or, alternatively, carbon dioxide (CO2);
• concentration of carbon monoxide (CO).
The temperature of the combustion air must be measured close to the point where the air enters the boiler.
The hole, which must be made by the person in charge of the system during commissioning, must be sealed so as to ensure that the
exhaust duct is airtight during normal operation.
24. CHECKING COMBUSTION PARAMETERS
