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3.3 YEARLY APPLIANCE CHECK AND
MAINTENANCE
The following checks and maintenance should be per-
formed once a year to ensure operation, safety and effi-
ciency of the appliance over time.
- Clean the flue side of the heat exchanger.
- Clean the main burner.
- Visually check the flue hood for deterioration or corrosion.
- Check correct lighting and operation.
- Ensure correct calibration of the burner in domestic water and
central heating phases.
- Check correct operation of control and adjustment devices and
in particular:
• activation of the main switch located outside the boiler;
• system control thermostat intervention;
• domestic hot water control thermostat intervention.
- Check sealing efficiency of gas circuit and the internal system.
- Check the intervention of the device against no gas ionisation
flame control. Intervention time must be less than 10 seconds.
- Check for water leaks or oxidation from/on the fittings.
- Visually check that the drain of the water safety valves is not
blocked.
- Check that, after discharging system pressure and bringing it to
zero (read on boiler pressure gauge), the expansion vessel load is
at 1.0 bar.
- Check that the system static pressure (with system cold and
after refilling the system by means of the filling valve) is between
1 and 1.2 bar.
- Check visually that the safety and control devices have not been
tampered with and/or shorted, in particular:
• temperature safety thermostat;
• water pressure switch;
- flue pressure switch.
- Check the function of the electrode.
- Check the condition and integrity of the electrical system and in
particular:
• the power supply wires must be housed in the cable glands;
• there must be no traces of blackening or burning.
- Check the contents of the condensate drain trap.
- Visually check that the siphon is properly filled with condensate
and top it up if necessary.
- Check that there are no material residues in the condensate
drain siphon and in the duct between this and the condensing
heat exchanger clogging the condensate passage; also check that
the entire condensate drainage circuit is clear and efficient.
Gas type
CO2 to nominal Q.
CO2 to minimum Q.
G20
7.3% (± 0,5)
3.95% (± 0,5)
G31
7.9% (± 0,5)
4.7% (± 0,5)
In addition to yearly maintenance, one must also check
the energy efficiency of the thermal system, with fre-
quency and procedures that comply with the indications
of the technical regulations in force.
