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3.3
YEARLY APPLIANCE CHECK AND MAINTENANCE
The following checks and maintenance should be performed once a year to ensure operation, safety and efficiency of the appli-
ance over time.
- Clean the flue side of the heat exchanger.
- Clean the main burner.
- Check the correct positioning, integrity and cleanliness of the detection and ignition electrode; remove any oxide present.
- If deposits are detected in the combustion chamber they must be removed and the heat exchanger coils must be cleaned using nylon or
broomcorn brushes; it is forbidden to use brushes made of metal or other materials that may damage the combustion chamber. It is
also forbidden to use alkaline or acid detergents.
- Check the integrity of the insulating panels inside the combustion chamber and if damaged replace them.
- Visually check for water leaks or oxidation from/on connections and traces of condensate residues inside the sealed chamber.
- Check the contents of the condensate drain trap.
- Check that there are no material residues in the condensate drain siphon clogging the condensate passage; also check that the entire
condensate drainage circuit is clear and efficient.
- In the event of obstructions (dirt, sediment, etc.) with consequent leakage of condensate in the combustion chamber, one must replace
the insulating panels.
- Check that the burner and gas manifold seal gaskets are intact and perfectly efficient, otherwise replace them. In any case the gaskets
must be replaced at least every two years, regardless of their state of wear.
- Check that the burner is intact, that it has no deformations or cuts and that it is properly fixed to the combustion chamber lid; other-
wise it must be replaced.
- Visually check that the water safety drain valve is not blocked.
- Check that, after discharging the system pressure and bringing it to zero (read on boiler pressure gauge), the expansion vessel pressure
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:
• the power supply wires must be housed in the cable glands;
• there must be no traces of blackening or burning.
- Check the integrity of the storage tank's Magnesium Anode (when paired with a storage tank unit).
- Check correct lighting and operation.
- Check the CO
/O
by using the chimney sweep function at the reference heat outputs, using the parameters in the table below. Should
2
2
values out of the indicated tolerance range be detected, check the calibration again (See par. 3.9).
- Check the correct calibration of the burner in the DHW phase (when the boiler is connected to an external cylinder unit) and central
heating phase.
- Check correct operation of control and adjustment devices and in particular:
• system regulation probes intervention;
• The intervention of the DHW adjustment thermostat (when paired with a storage tank unit).
- 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.
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