Ferroli GN 3, Инструкция по установке и эксплуатации

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10
GN3
Heating plant installation (fig. 11).
If there is a boiler recirculating pump, it is obligatory to
mount non-return valves upstream of the return union to
prevent parasitic circulations in the generators.
The recirculation flow rate must be between:
P P
and
5 45
P = Capacity of each boiler expressed in kcal/h
Burner operation must be linked to that of the recircula-
tion pump. It must only operate if the pump operates. As
an accessory, a flow rate monitoring device in series with
thermostat TH can be mounted on the return pipe leading
to the boiler, downstream of the recirculating pump.
Flue connection
Always connect the boiler to a good flue, built in complian-
ce with the current provisions in force. The duct between
the boiler and flue must be made of suitable material, i.e.
able to withstand the temperature and corrosion. Always
check the seal in the jointing points and thermally insulate
the entire pipeline between the boiler and stack, to
prevent the formation of condensation.
Fig. 11