Green Heating Technology
19
0
1
2
3
4
5
6
7
0
200
400
1000
1200
600
800
1400
00149
02
MAX
MIN
pr
essur
e (m H
2
O)
water flow (l/h)
by-pass auto
by-pass closed
Mod . 35 K
The graph is referred
to the capacity available
to the system.
Note: the diagram MAX is referred to the maximum working power of the pump, the diagram MIN
depends on electronics. The pump is continuous electronic modulation type and therefore it can
work on any point between them.
Specifications for inlet air
Air must be withdrawn from places free of pollutant (like fluorine, chlorine, sulfur, ammonia, alkaline or
similar agents). In the event of installation of the boiler in atmospheres with not negligible presence of
aggressive chemical substances (e.g. hairdressing salons, laundries) we recommend to foresee the air
inlet from outdoor, choosing the type C installation.
Domestic water supply characteristics
The cold water inlet pressure should be within the minimum and maximum limits specified in "Tech
-
nical data" on page 52 .
The minimum pressure limit is foreseen to allow the correct restore of the
pressure in the heating system.
In case of water pressure above the maximum limit,
it is indispensable to install a PRESSURE
REDUCER
upstream the boiler.
The cleaning frequency of the storage coil depends on the water supply hardness .
If the water hard-
ness is more than 25° fr it’s required to install a softener to bring the hardness below that value.
Besides, the presence of solid residuals or impurities in the water (for example in case of new systems)
could compromise the correct functioning of the boiler. For DHW production systems, the regulation in
force prescribes a safety filter to protect the systems.
The condensing burner/exchanger assembly requires particular characteristics for the heating
system liquid
, more restrictive than the ones of the inlet domestic water. See the "Heating" sec
-
tion of the table "Technical data" on page 52.
Protection against freezing
Thanks to its antifreeze system, inner components could never reach a temperature lower than 5°C. This
system is activated when the boiler is supplied by the electrical and gas lines, provided that the pressure
in the heating system is correct.
