16
As soon as the pressure exceeds the safety valve setting, the valve
opens and discharges a small quantity of water.
Using a hot water expansion vessel
(5 litres at least) will prevent this
phenomenon and reduce water hammer.
Drain the tank by turning on a hot water tap. Beware: the discharge
of water and air at the same time causes the water to flow in fits and
starts.
INSTALLATION
UK
CONNECTION TO THE GAS
- The Prestige is fitted with a 3/4” M connector, to which you can
connect the gas tap.
-You must comply with the NBN D51-003 standard for connections
to the gas and, if applicable, with the other standards in force in
the location of the connection.
- Where there is a risk of dirt stemming from the network, place a
gas filter upstream from the connection.
-Drain the gas pipe and check in minute detail that all the boiler
pipes, both inside and outside, are sealed.
- Check the gas pressure in the system. Consult the technical data
table on pages 6 and 7.
- Check the gas pressure and consumption when commissioning
the appliance.
The hot water output temperature may reach
temperatures in excess of 60°C, which can
cause burns. We therefore recommend that
that you install a thermostatic mixer immedia-
tely after installing the appliance.
If stop valves are used in the domestic hot water sys-
tem, they can cause pressure waves when closed. Use
devices designed to reduce water hammer to avoid
this phenomenon.
Prestige AquaSpeed
The Prestige AquaSpeed can
be connected directly to the
domestic hot water circuit.
The connection measurements
are given in the diagram on
pages 10 - 11.
Flush out the system before
connecting the domestic hot
water part.
The installation must be fitted
with an approved safety unit
with a 6-bar safety valve, a
non-return valve and a shut-off
valve.
If the flow demands become
too high, the desired water tem-
peraturewill not be reached.
To avoid this phenomenon, we
recommend that you place a
flow limiter in the cold water pipe just before the appliance.
During the heating process, the domestic hot water dilates and the
pressure increases. As soon as the pressure exceeds the safety
valve setting, the valve opens and discharges a small quantity of
water. Using a hot water expansion vessel
(2 litres at least) will pre-
vent this phenomenon and reduce water hammer.
Prestige Excellence
The Prestige Excellence can
be connected directly to the
domestic hot water circuit.
The connection measurements
are given in the diagram on
pages 10 - 11. Flush out the
system before connecting the
domestic hot water part.
The system must be fitted with
an approved safety unit with a
6-bar safety valve, a non-return
valve and a shut-off valve.
During the heating process, the
domestic hot water dilates and
the pressure increases.
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