Baxi NUVOLA DUO-TEC GA 16, Instruction Manual For Users And Fitters

Page: 38 / 112

7114043.01 (1-06/13) 38
INST
ALLER Section
(en)
18. ANNUAL SERVICING
If the boiler was operating, wait for the combustion chamber and pipes to cool down.
Before commencing any maintenance operations, make sure the boiler is disconnected from the power supply. After servicing,
reset the original operating parameters of the boiler if they were changed.
Do not clean the boiler with abrasive, aggressive and/or easily flammable substances (such as petrol, acetone, etc.).
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 pressure of the heating system;
• Check the pressure of the expansion vessel;
• Check the fan works correctly;
• Make sure the flue and air ducts are unobstructed;
• Check for any impurities inside the siphon (for condensation boilers);
• Check the magnesium anode, where present, for boilers fitted with storage boilers.
18.1 POSITIONING THE ELECTRODES
5
±1
4
±0
,5
10 ±1
CG_2190
18.2 REPLACEMENT OF PARTS
If one or more of the following components are replaced:
• Water-fumes exchanger
• Fan
• Gas valve
• Gas nozzle
• Burner
• Flame sensing electrode
perform the Automatic Calibration procedure described below, then check and adjust the CO
2
% value as indicated in the section
“ COMBUSTION ADJUSTMENT FUNCTION (CO
2
% ) ”.
When working on the appliance, check the condition and position of the flame sensing electrode and replace it if necessary.