17
MYDENS
COSMOGAS
5 - INSTALLATION
5.5 - Low-temperature systems
a
WARNING!!! The system after the appliance must
be made with materials that resist temperatures up
to 95°C and pressure of 3 bar. Otherwise (e.g. with
plastic piping), the system must be fitted with the
relevant protection and safety devices.
a
WARNING!!! When installing the appliance in
a low temperature system, set parameter
2024
to 45°C and parameter
2023
to 20°C (see section
7.16).
With this setting, the appliance will adjust the supply to a
temperature between 20°C and 45°C. No adjustment from
the control panel (also via outdoor reset) can supply water
at a temperature over 45°C.
a
WARNING!!! If the appliance is installed in a low
temperature system made with plastic piping, all of
the necessary precautions must be taken against
corrosion due to oxygen in the water: make sure that
the system is made with plastic pipes with oxygen
permeability not exceeding 0.1 g/m3 at 40°C. Should
the pipe not meet these characteristics, the radiant
panel circuit must be isolated from the appliance,
via a plate heat exchanger suitable for resisting the
corrosion generated by the oxygen dissolved in the
water.
5.6 - Domestic hot and cold water
In Figure 10 you can check the right position of connections.
a
WARNING!!! If water hardness exceeds 25°F,
were commend installing a water softener (section
5.13).
a
WARNING!!! Install a filter with mesh no wider
than 0.5 mm² in the domestic cold water inlet.
a
WARNING!!! The domestic hot water circuit must
be made with materials resistant to temperatures
of at least 95°C and a pressure of 10 bar. Otherwise
(e.g. with plastic piping), the system must be fitted
with the relevant protection and safety devices.
a
WARNING!!! If the appliance is connected to a
domestic hot water recirculation circuit, install a
safety valve and an expansion tank of a suitable size
for managing the natural increase in the volume of
water during heating.
l
Insert a shut off valve before the cold water inlet,
useful for maintenance work.
If the appliance is used for central heating only, simply
connect the cold water pipe to fill the central heating system
and close the DHW outlet.
5.7 - Gas
In Figure 10 you can check the right position of connections.
d
It is forbidden power the appliance with gases
other than those specified.
a
WARNING!!! Check that the gas and supply
pressure are those for which the appliance has been
adjusted; if they correspond make the connection,
if not the appliance must be converted to the type
of gas and supply pressure corresponding to those
of the supply available, using the appropriate gas
conversion kit.
a
WARNING!!! Before installation, clean the inside
of the gas supply pipe thoroughly.
l
It is mandatory to install a shut-off valve on the gas
supply pipe;
a
WARNING!!! To prevent damage to the appliance
gas control unit, run a leak test at a pressure not
exceeding 50 mbar.
a
WARNING!!! If the gas system must be inspected
at pressures over 50 mbar, turn the valve positioned
immediately before the appliance, to isolate it from
the system.
a
WARNING!!! The cross-sections of the pipes
in the gas supply system must always guarantee a
gas supply that is sufficient to cover the maximum
requested.
