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3.3
YEARLY APPLIANCE CHECK AND MAINTENANCE
On the indoor unit:
- 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.
- 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 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.
- Every time the gas manifold is opened, the condition and integrity of the ceramic fibres must be verified and replaced, if necessary. The
gas manifold gasket, on the other hand, must be replaced every 2 years, regardless of the time elapsed. After replacing the external sil-
icone gasket, it is mandatory to check the fume tightness.
- Check that the burner is intact, that it has no deformations or cuts and that it is properly fixed to the gas manifold; otherwise it must be
replaced. Visually check that the drain of the water safety valve is not clogged.
- Check that the charge of the expansion vessel is 1.0 bar, after having discharged the system pressure and bringing it to zero (readable
on the pressure gauge of the appliance).
- 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.
- Visually check that the safety and control devices have not been tampered with and/or short-circuited.
- 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 correct lighting and operation.
- Check the CO
/O
by using the chimney sweep function at the reference heat outputs, using the parameters entered in the following
2
2
tables. Should values out of the indicated tolerance range be detected, check the calibration again.
- 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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