Ariston Velis EVO 50 EU Instructions Pour L'installation, L'emploi, L'entretien page 24

EN
MAINTENANCE REGULATIONS (for competent person)
CAUTION Observe all general warnings and safety standards listed at the begin-
ning of this text in full; all such instructions are obligatory.
All maintenance operations and service visits should be performed by a competent person (who
have the skills required by the applicable norms in force).
Before calling your Technical Servicing Centre, check that the fault is not due to lack of water or power failure.
Emptying the appliance
The appliance must be emptied if it is to be left unused in premises subject to frost.
When necessary, empty the appliance as follows:
- disconnect the appliance from the electricity mains;
- turn off the domestic mains tap;
- turn on the hot water tap (wash basin or bathtub);
- open the drain valve B (fig. 2).
Replacing parts
The electrical parts may be accessed by removing the cover (Fig. 7).
Intervene on the power board (Ref. Z) by disconnecting the cables (Ref. C, Y and P) and remove the screws.
Intervene on the control panel by first removing the power board (Ref. Z). The display board is attached to the
product through two fixing side flaps (A Fig. 4a) accessible from inside the lower cover.
Release the control panel fixing flaps using a flat screwdriver to pry upon the same (A Fig. 4b) and release
them from the pins, simultaneously push it outwards to free it from the seat. Repeat for both fixing flaps. Pay
special attention not to damage the plastic flaps as breaking them will not allow for correct assembly of the
panel in its seat, resulting in possible aesthetic defects. After removing the control panel, you can disconnect
the connectors of the rod carrying sensors and power board. Intervene on the rod carrying sensors (Ref.
K) by disconnecting the wires (Ref. F) from the control panel and remove it from its seat, taking care not to
excessively bend them.
During reassembly, make sure that all components are put back in their original positions.
To work on the heating elements and anodes, first drain the appliance (refer to the related paragraph). Re-
move the bolts (C Fig. 5) and remove the flanges (F Fig. 5). The flanges are coupled to the heating elements
and anodes. During reassembly, make sure to restore the rod carrying sensors and the heating elements to
the original positions (Fig. 7 and 5). Make sure that the flange plate with the coloured writing H.E.1 or H.E.2,
is mounted in its position marked by the same writing.
We recommend replacing the flange gasket (Z Fig. 6) every time it is disassembled.
CAUTION! The reversal of the heating elements involves malfunction of the appliance. Work on one
heating element at a time and remove the second only after replacing the first.
Use only original spare parts.
Periodical maintenance
The heating element (R fig. 6) should be descaled every two years to ensure it works properly (R Fig. 6)
approximately every two years (the frequency must be increased, if water is very hard).
If you pre- fer not to use special liquids for this operation, simply crumble away the lime deposit without
damaging the heating element.
The magnesium anodes (N Fig. 6) must be replaced every two years (this does not apply to appliances with
stainless steel boilers); however, the anode should be checked every year if the water is corrosive or chloride
rich. To replace them, remove the heating elements and unscrew them from the brackets.
The bypass pipe (X Fig. 7) is inspected in the event of fault due to its obstruction. To inspect it remove the
two rings (W Fig. 7).
After routine or extraordinary maintenance, we recommend filling its tank with water and draining
it completely so as to remove any residual impurities. Use only original spare parts supplied by the
manufacturer's authorised service centres.
Safety valve
Regularly check that the overpressure device is not jammed or damaged; if it is, remove any scale or
replace it.
If the device has a lever or knob, operate it to:
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