COSMOGAS MYDENS, Installation, Use And Maintenance Manual

Page: 15 / 76

15 MYDENS
COSMOGAS
5 - INSTALLATION

A continuous intake of water into the central heating
circuit increases the content of oxygen and lime scale
with a risk of corrosion inside the heat exchanger body,
with consequent reduction of the boiler’s lifespan. Any
leaks from the central heating circuit must be repaired to
prevent the problem.
5.5 - Low temperature
plants (or on the floor)
ATTENTION !!! The plant downstream from
the appliance must be made with materials that
resist temperatures up to 95°C and pressure of 3 bar.
Differently (e.g. plastic piping) the plant must be fitted
with the relevant protection and safety devices.
ATTENTION !!! when installing the boiler in
a low temperature plant, it is indispensable to set
the parameter
3015
at the value of 45°C and the
parameter
3016
at the value of 20°C (see chapter 11).
With this setting, the boiler will adjust the supply to a
temperature between 20°C and 45°C. No adjustment from
the command panel (also via climatic adjustment), can
supply water at a temperature over 45°C.
ATTENTION !!! If the boiler is installed in a
floor-standing plant made with plastic piping, all of the
precautions must be taken against corrosion due to
oxygen in the water:
make sure that the plant is made with plastic pipes with
permeability to oxygen not exceeding 0.1 g/m3 at 40°C.
Whenever the pipe should not meet these features, the
radiant panel circuit from the boiler must be isolated, via
a plate heat exchanger suitable to resist the corrosion
generated by the oxygen dissolved in the water.
5.6 - Domestic hot and cold water
ATTENTION !!! If water hardness exceeds 25°F,
we recommend the installation of a polyphosphates
softener (see chapter 5.13).
ATTENTION !!! Install a filter with mesh no wider
than 0.5 mm² in the domestic cold water inlet.
ATTENTION !!! The domestic hot water
circuit must be realised with materials resistant to a
temperature of at least 95°C and pressure of 10 bar.
Differently (e.g. plastic piping) the plant must be fitted
with the relevant protection and safety devices.
In figure 5.2 it is possible to verify positioning of the
domestic hot and cold water fittings.
Envision a closing cock upstream from the cold water inlet,
useful for maintenance works.
The connection of the domestic hot water service is not
indispensable; if the boiler is used for central heating only,
just connect the cold water pipe to fill the central heating
plant and close the d.h.w. outlet.
5.7 - Gas
ATTENTION !!! It is prohibited to power the
appliance with gases different to that envisioned.
ATTENTION !!! Check that the gas and supply
pressure are those for which the boiler has been
adjusted.
Two situations are possible:
A - the gas and supply pressure correspond to the
adjustment of the boiler. In this case, it can be
connected;
B - the gas and supply pressure do not correspond to the
adjustment of the boiler. In this case, the boiler must
be converted to the type of gas and supply pressure
corresponding to those of the supply available.
The boiler is provided with the relevant gas conversion kit.

Before installation it is advised to clean the inside of the
gas supply pipe thoroughly;

A cut-off cock must always be installed on the gas
supply pipe;

To prevent damage to the appliance gas control unit, the
leak test at a pressure not exceeding 50 mbar;

If the gas plant must be inspected at pressures over
50 mbar, operate on the cock positioned immediately
upstream from the boiler, to isolate the same from the
plant.
Figure 5.2 verifies the positioning of the appliance gas
fitting. The sections of the pipes making up the gas supply
plant must always guarantee a gas supply sufficient to
cover the maximum requested.