î
The device is designed for
heating drinking water. The
drinking water shall comply
with the regulations applica-
ble to drinking water for human
consumption.
î
When using sealant for connections
of the DHW circuit pipes or sensor
installation on DHW pipes, make sure
to use a sealing agent that is compat-
ible with the regulations applicable to
drinking water for human consump-
tion (e.g. Loctite 326 + 7649).
î
The pressure of the water network used to
fill the appliance must be at least 1.2 bar.
î
The supply pressure from the network
must be comprised between 1.2 and 6
bar. If the pressure is higher than 6 bar, a
pressure reducing valve must be installed.
î
Install a check valve at the cold water
inlet.
î
Make sure that the circuit is pro-
vided with a safety group. It must
be composed of a safety valve set
at 6 bar, a check valve and a stop
valve.
î
Hot water can cause severe burns!
The hot water produced in the cir-
cuit can reach temperatures higher
than 60°C and cause scalding when
drawn unmixed from a tap. The in-
stallation of a thermostatic mixing
valve is therefore recommended.
î
Do not leave young children, elder-
ly or disabled people in the bath or
the shower without supervision, as
they could be exposed to extreme-
ly hot water if they use the hot wa-
ter tap by themselves.
î
The temperature of the DHW cir-
cuit shall be set according to local
plumbing regulations and usage.
Safety Instructions for the DHW Circuit
î
Flush thoroughly the circuit be-
fore operation.
î
It is recommended to install a
filter <100µm to prevent res-
idues to contaminate the cir-
cuit.
î
Setting the temperature higher than
60°C over long periods of time will
cause faster formation of scale and
reduce the water heater efficiency in
time.
î
To prevent the early formation of scale
and maintain a good operational condi-
tion of the water heater, soften the wa-
ter to reach a pH comprised between
6.5 and 8.5.
î
It is recommended that the water after
passing through the softening installa-
tions and mixed with the unsoftened
water should contain about 1.5 mol/m3
of calcium.
î
The installation of an expansion vessel
in the DHW circuit is recommended to
prevent the water hammer effect in the
pipework and the frequent opening of
the safety valve. In addition, the circuit
between the tank and the safety valve
must always remain open.
î
To prevent the development of the bac-
teria Legionella Pneumophilia in the
DHW circuit, it is recommended to ac-
tivate the antilegionella function of the
appliance.
î
The circuit diagrams are theoretical
representations that do not necessarily
include all the required safety devices.
Make sure to correctly plan your sys-
tem according to the applicable local
regulations and standard practice.
î
To improve water distribution to the hot
water taps, we recommend the installa-
tion of a circulation pump in the DHW
circuit, in accordance the applicable lo-
cal regulations and standard practice
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I-34
H-093630_EN • 00
P
roduct
I
nstallatIon