23
926.323.1 - GB
INSTRUCTIONS FOR FITTERS
To optimise boiler efciency, carry out the following annual controls:
• check the appearance and air-tightness of the gaskets of the gas and combustion circuits;
• check the state and correct position of the ignition and ame-sensing electrodes;
• check the state of the burner and make sure it is rmly xed;
• 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;
• check the fan works correctly;
• make sure the ue and air ducts are unobstructed;
WARNINGS
Before commencing any maintenance operations, make sure the boiler is disconnected from the power supply.
Afterwards, move the knobs and/or operating parameters of the boiler to their original positions.
28. ANNUAL SERVICING
0808_2601 / CG_2078
Figure 16
WARNING
Pay great attention when dismantling the individual parts of the hydraulic assembly.
Do not use sharp tools, do not apply excessive force when removing the xing clip.
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