Annual Servicing; Combustion Parameters; Positioning The Electrodes - Baxi LUNA DUO-TEC MP 1.90 Manual De Uso

18. ANNUAL SERVICING

To optimise boiler efficiency, carry out the following annual controls:
• Check the appearance and airtightness of the gaskets of the gas and combustion circuits;
• Check the state and correct position of the ignition and flame-sensing electrodes;
• Check the state of the burner and make sure it is firmly fixed;
• Check for any impurities inside the combustion chamber. Use a vacuum cleaner to do this;
• Check the gas valve is correctly calibrated;
• Check the pressure of the heating system;
• Check the pressure of the expansion vessel (system);
• Check the fan works correctly;
• Make sure the flue and air ducts are unobstructed;
• Check for any impurities inside the siphon.
Before commencing any maintenance operations, make sure the boiler is disconnected from the power supply. After servi-
cing, reset the original operating parameters of the boiler if they were changed.

18.1 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 O2 or carbon dioxide CO2 concentration
• carbon monoxide CO 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 9 cm (C).
To enable the " CHIMNEY SWEEPER" consult section 12.3.

18.2 POSITIONING THE ELECTRODES

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