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3.2.9. Gas mains connection
The cross-section of the gas supply pipe must be equal to or greater than that of the boiler gas inlet pipe.
The cross-section of the pipe depends on its length and route and the gas flow rate. The gas pipe must be dimensioned
accordingly.
Comply with the installation standards in force in the country of use, which are considered an integral part of this
manual.
Before operating an internal gas distribution system and connecting it to the meter, it must be checked for
leaks.
If any part of the system is going to be inaccessible, the leak test must be carried out before the pipes are
covered.
The leak test must NOT be carried out using flammable gas: use air or nitrogen for this purpose.
If the pipes are already filled with gas, leak testing using a naked flame is forbidden. Use one of the specific
products available on the market.
It is MANDATORY when connecting the boiler to the gas supply network to use a gasket of a suitable size and
material (fig. 19).
Hemp, Teflon tape or the like must NOT be used with this type of fitting
3.2.10. Plumbing connection
Before installing the boiler, it is advisable to clean the system to remove any impurities present in the components, which
would damage the pump and the heat exchanger (see 3.2.4.).
CENTRAL HEATING SYSTEM
The CH flow and return pipes must be connected to the corresponding 3/4” M and R fittings on the boiler (figs. 6 and 7). When
calculating the size of the CH pipes, bear in mind load losses caused by radiators, thermostatic valves, radiator gate valves and
the overall configuration of the system.
It is advisable to convey the flow from the boiler safety valve to a sewer system. If this precaution is not taken,
the boiler room may flood if the safety valve activates.
The manufacturer declines all liability for damage resulting from failure to comply with this technical
precaution.
DOMESTIC HOT WATER SYSTEM
The water mains inlet pipe and the DHW flow pipe must be connected to the corresponding 1/2” F and C fittings on the boiler
(figs. 6 and 7). The frequency at which the secondary plate heat exchanger needs to be cleaned depends on the hardness of
the mains water.
If the water is very hard, it may be necessary to install a drinking water treatment device for domestic use in
compliance with the applicable laws and standards in the country of use.
Water treatment is always advisable when the water hardness exceeds 20°F.
Due to the pH level, water treated using standard softners may not be compatible with some of the
components in the system.
GASKET
fig. 19
