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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 the presence and cleanliness of the water inlet filter, which guarantees the efficiency of the appliance.
- 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. After replacing the external silicone 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 water safety drain valve is not blocked.
- 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.
- 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;
• Tripping of the DHW control thermostat (if combined 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 5 seconds.
- Check the flue gas non-return valve at the fan outlet (inside the unit).
- Check and if necessary, clean the siphon of the flue gas non-return valve in the flue in installations C
If the flue gas non-return valve in the flues must be removed to inspect and clean it, temporarily plug the exhaust pipe connected
to the collective flue. This prevents the return of fumes from the other appliances connected to the flue itself.
80
- C
.
(10)
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