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Idiomas disponibles
A relief valve not supplied - (ref. 11 in fig. 10 and fig. 11) with setting equal to or greater than the max. DHW pres-
sure given in the technical data tables (see "4.6 Technical data table") must be installed on the cold water feed
pipe upstream of the hot water tank.
The connection pipe between the hot water tank and relief valve must absolutely not be shut off, as damage to the
hot water tank could occur due to overpressure.
The relief valve outlet must be connected to a funnel or collection pipe (not supplied - ref. 13 in fig. 10
and fig. 11), to prevent water spurting onto the floor in case of overpressure in the hot water tank
circuit. Otherwise, if the discharge valve cuts in and floods the room, the boiler manufacturer cannot
be held liable.
Slight dripping from the relief valve is normal in the heating phase; therefore it is advisable to connect it to a drain
with trap.
In case of a mains pressure near the valve setting values, a suitable pressure reducer (not supplied - ref. 15 in fig.
10 and fig. 11) must be fitted as far away as possible from the unit.
DHW expansion vessel
The DHW expansion vessel must be sized according to the capacity of the hot water tank and the cold water pressure.
If the system has a pressure reducer, for the reason described above, and/or a check valve, it is mandatory to
install an expansion vessel (not supplied - ref. 14 in fig. 10 and fig. 11) having a capacity not less than 5% of the
hot water tank nominal capacity.
Do not install a check valve between the relief valve and the expansion vessel. In general, to safeguard the unit
and the system, it is advisable to install the expansion vessel with the characteristics defined above.
Fill the special expansion vessel diaphragm chamber according to the manufacturer's instructions.
2.4 Use of the Heating Element (2000W - 230V)
Powered directly from the mains
The heating element (ref. R - fig. 2) can be used as an
auxiliary DHW heating system or as a frost protection
system. In the latter case, set the thermostat knob (ref.
A - fig. 2) to minimum (15 °C).
If intending to use it for water heating, the thermostat
knob "A" controls the heating temperature (Setpoint) of
the element, adjustable between 15 °C and 75 °C.
Controlled/Supplied by Generator (PDC)
In this case, the hot water tank temperature will be directly
controlled by the generator sensor located in the relevant
well (ref. 3 - fig. 10 and fig. 11).
The control thermostat (ref. A - fig. 2) must be set to
maximum.
The frost protection function will be managed directly by
the generator.
42
EN
Cod. 3540000190 - Rev. 06 - 06/2023
BSF HP
A
fig. 2
R
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