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Also ensure that the electrical installation corresponds to maximum absorbed power specifications as shown on the appliance data
nameplate.
Boilers are supplied complete with a special "X" type power cable without plug.
The power supply cable must be connected to a 230V ±10% / 50Hz mains supply respecting L-N
polarity and earth connection; this network must also have a multi-pole circuit breaker with
class III overvoltage category in compliance with installation regulations.
To protect from possible dispersions of DC voltage, it is necessary to provide a type A differen-
tial safety device.
If the power supply cable is damaged, it must be replaced by a special cable or assembly, which
are only available from the manufacturer or its Authorised After-Sales Technical Assistance
Centre.
It is recommended to contact a qualified company (e.g. the Authorised After-Sales Technical
Assistance Centre) for replacement to avoid a hazard.
The power cable must be laid as shown (Fig. 7).
If the network fuse indicated in the wiring diagram (Fig. 39) as component "F1" on the P.C.B. needs to be changed, this operation must
also be performed by qualified personnel using a 3.15A rapid type (F) 250VAC fuse (dimension 5 x 20).
For the main power supply to the appliance, never use adapters, multiple sockets or extension leads.
Connect terminals 36 and 37 to electrically connect the boiler to the storage tank unit, elimi-
nating resistance R8 in the boiler (Fig. 39).
Installation with system operating at direct low temperature.
The boiler can directly supply a low-temperature system by setting the flow temperature adjustment range "t0" and "t1" (Par. 3.11).
In this situation it is good practice to insert a relevant safety kit (optional) made up from a thermostat (with adjustable temperature).
The thermostat must be positioned on the system flow pipe at a distance of at least 2 metres from the boiler.
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