Positioning The Ignition And Flame-Sensor Electrode; Checking Combustion Parameters - Baxi Nuvola 3 BS 40 Series Operating And Installation Instructions

22. POSITIONING THE IGNITION AND FLAME-SENSING ELECTRODE
Figure 14

23. CHECKING COMBUSTION PARAMETERS

To measure combustion performance and the toxicity of the products of combustion, the forced-flow boilers are fitted with
two dedicated taps on the concentric connector.
One connection point is connected to the exhaust duct and is used to measure combustion efficiency and the toxicity of
the products of combustion.
The other is connected to the air intake circuit and is used to check for the presence of any products of combustion circu-
lating in installations with co-axial flues.
The following parameters can be measured at the connection point on the flue gas circuit:
The combustion air temperature must be measured at the connection point on the air intake circuit, inserting the measu-
rement probe to a depth of about 3 cm.
For natural draught boiler models, a hole must be made in the exhaust flue at a distance from the boiler equal to twice
the internal diameter of the flue.
The following parameters can be measured through this hole:
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.
INSTRUCTIONS FOR FITTERS
) or, alternatively, carbon dioxide (CO
2
) or, alternatively, carbon dioxide (CO
2
2
2
52
7113868.01 - en