37 / EN
ELECTRICAL CONNECTION
It is mandatory, before installing the appliance, to perform an accurate control of the electrical sys-
tem by verifying compliance with current safety standards, which is adequate for the maximum pow-
er absorbed by the water heater (refer to the data plate) and that the section of the cables for the
electrical connection is suitable and complies with local regulations.
The manufacturer is not liable for damage caused by lack of grounding or anomalous power supply.
Before starting up the appliance, check that the power rating matches that given on the nameplate. The
use of multiplugs, extensions or adaptors is strictly prohibited.
It is strictly forbidden to use the piping from the plumbing, heating and gas systems for the appliance
earthing connection. If the appliance is supplied with a power supply cable, should the latter need re-
placing, use a cable featuring the same characteristics (type H05VV-F 3x1,5 mm
2
, 8,5 mm in diameter).
The power cable (H05VV-F 3x1.5 mm
2
dia. 8.5 mm) must be routed in the recess at the back of the ap-
pliance to the terminal block (
Fig. 7, Ref. M
). Tighten down the terminal screws to connect the individual
wires securely. Secure the power supply cable in place using the special cable clamps provided with the
appliance. Use a two-pole switch conforming with national laws in force (contact gap of at least 3 mm,
preferably equipped with fuses) to disconnect the appliance’s power supply.
The appliance must be grounded with a cable yellow/green and longer than the phase cable) connected
to the terminals marked
(
Fig.7, Rif. G
).
Before starting up the appliance, check that the power rating matches that given on the nameplate.
If the appliance is not supplied with a power supply cable, choose one of the following installation
modes:
- Connection to mains with a rigid pipe (if the appliance has no cable clamp); use a cable with a minimum
3x1,5 mm
2
section;
- With a flexible cable (type H05VV-F 3x1,5 mm
2
, 8,5 mm in diameter), if the appliance is supplied with a
cable clamp.
Startup and commissioning
Before powering up the appliance, fill the heater with mains water.
To do so, open the mains cock and the hot water tap until all the air has been vented from the boiler.
Check for water leaks from the flanges, from the by-pass pipe, tighten down the bolts not too much, if neces-
sary (
Fig.5, Rif.C
) and/or the rings (
Fig.5
).
Power the appliance by actuating the switch.
MAINTENANCE (FOR QUALIFIED PERSONNEL)
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.
WARNING: disconnect the appliance from the mains before conducting any maintenance work.
Emptying the appliance
The appliance must be emptied if it is to be left unused for a long period and/or in premises subject to frost.
To drain the appliance, proceed as follows:
- disconnect the appliance from the electricity mains;
- close the cut-off valve, if installed (
Fig. 2, Ref. D
), or the main household water valve, if not;
- turn on the hot water tap (wash basin or bathtub);
- open the drain valve (
Fig. 2, Ref.B
).
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