32
COSMOGAS
Ecotower
6 - INSTALLATION
6.11 - Domestic hot and cold water
Figure 3-1 shows the positioning of the domestic hot and cold
water pipes.
Provide a shut-off valve upstream of the cold water inlet, useful
for maintenance work.
WARNING!!!
The domestic hot water circuit must
be made of materials resistant to a temperature of at least
95 ° C and a pressure of 7 bar. Otherwise (e.g. pipes made
of plastic materials) the system must be equipped with
the appropriate protective devices.
WARNING
!!! If the appliance is connected to a
DHW recirculation circuit, a Pressure safety relief valve
and an expansion tank, suitably sized, must be installed
to manage the natural increase in water volume during
the heating.
WARNING
!!! If the hardness of the water is higher
than 20°F (200 mg/l), a water softener must be installed
on the cold water inlet.
WARNING
!!! The water must not be softened to
values lower than 5°F (50 mg/l). At these values it becomes
acidic and can corrode parts of the hot water heater,
shortening its life.
WARNING
!!! The acidity of the water must have a
pH value between 6.5 and 8.5. A value outside this range
is corrosive, it can cause damage to the heat exchanger
and / or to the pipes.
6.11.1 - Pressure safety relief valve
The appliance is protected against overpressures by a
pressure safety relief valve calibrated to 7 bar (see Figure
5-3 item “44”) supplied with the accessories. This valve must
be installed in the domestic cold water inlet (see Figures from
5-3 to 5-10).
The safety valve drain must be conveyed by the installer into
a pipe which must then be taken to an anti-odor siphon. This
drain with siphon is designed to prevent any overpressure in
the event of opening the valve from being conveyed to the
home drainage system.
WARNING!!!
If the pressure safety relief valve is
not connected to the drain, whenever the valve intervenes,
it could cause damage to persons, animals or objects.
6.12 - Antilegionella
This appliance does not require anti-legionella cycles,
as the production of domestic hot water is guaranteed
instantaneously through the passage of water inside the buffer
tank (see Figure 5-3).
