Baxi Nuvola 3 Comfort Notice D'emploi Et D'installation page 30

• Anti-legionellosis function
The anti-legionellosis function is NOT enabled.
To enable this function, set parameter F21=01 (as described in section 21). When the function is enabled, the electronic
management of the boiler, at weekly intervals, heats the water contained in the storage boiler to over 60°C (the function only
works if the water has never exceeded 60°C in the previous 7 days).
N.B.: domestic hot water is guaranteed even if the NTC sensor develops a fault (ref 5. - figures 19-20) . In this case, temperature
is controlled by the delivery sensor.
23. POSITIONING THE IGNITION AND FLAME-SENSOR ELECTRODE
Figure 14
24. CHECKING 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, and allows monitoring of the quality of the combustion
products and the combustion efficiency.
The other is connected to the combustion air intake circuit, 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 (O ) or carbon dioxide (CO
2
• carbon monoxide (CO) concentration.
The temperature of the comburent air must be measured on the test point located on the air intake flue by inserting the mea-
surement sensor by 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:
• temperature of the products of combustion;
• concentration of oxygen (O
• 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.
INSTRUCTIONS FOR FITTERS
) concentration;
2
) or, alternatively, carbon dioxide (CO
2
);
2
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