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TECHNOLOGY
Combustion
The SCREEN fireplace utilises the SCP® system, which works by
feeding air to the fireplace exactly at hearth level (primary air)
and by injecting other air at other positions in order to complete the
A
combustion process. In this manner, while the yield of the fireplace is
increased, the emission of pollutants is noticeably reduced. Therefore,
aside from the frontal air-intake, air is drawn into the fireplace both
through a duct located beneath the hearth (post-combustion air)
as well as through another located above the glass (secondary air
for glass cleanliness):
fig.4
-Primary air: enters at the base of the hearth where the embers are
found. The primary air mainly participates in initial combustion.
X
-Post-combustion air: is emitted into the flow of the combustion
gasses (smoke) from just beneath the ceiling component, by means
of a duct located beneath the hearth (fig. 4). The air enters the duct
from beneath the hearth and is heated due to the strong irradiation
to which it is subjected. It then enters the fireplace, through holes of
variable diameter, in such a way so as to provide the right amounts of
air to the various zones of the combustion chamber. While leaving the
combustion chamber, the air encounters the flow of smoke and sparks
a second combustion process which burns off any present carbon
monoxide: this process is called post-combustion.
-Secondary air for glass cleanliness: contributes to the crea-
tion of a sheet of air which impedes the smoke particles from depo-
siting upon the glass. Secondary air also moves on to contribute to
combustion and to the ulterior reduction of CO levels.
- Adjusting the combustion air via the thermostatic valve
V (Page 19 Fig. 6)
16
The combustion air is drawn in from air box no. 10 (Page 18 Fig. 2)
fig.5
via inlet 11 (Page 18 Fig. 2) and reaches the hearth through grille X
(Page 19 Fig. 5).
This is adjusted by means of valve V (Page 19 Fig. 6).
If the temperature inside the hearth is low, the valve opens automati-
Y
cally and vice versa, i.e. it closes when the temperature is high.
This allows the right quantity of wood to be consumed for the set tem-
V
perature to be reached and unnecessary waste is avoided.
Note: when the thermostatic valve closes the combustion air inlet
completely (the hearth temperature is very high), limited but sufficient
access is allowed for the air to enter and keep the glass clean.
- Manually adjusting the combustion air via the damper Y
(Page 19 Fig. 5)
17
A second intake of combustion air is drawn into the hearth through
fig.6
the damper Y, which is adjusted via lever 17 (Page 18 Fig. 3B)
• lever 17 turned to the right: minimum combustion air
• lever 17 turned to the left: maximum combustion air
• obviously, all intermediate settings are possible.
- Operating functions
• AUTOMATIC: set lever 16 (Page 18 Fig. 3B) completely to the left
• MANUAL: set lever 16 completely to the right (Page 18 Fig. 3B);
this setting disables the thermostatic valve V (Page 19 Fig. 6)
• SEMI-AUTOMATIC: lever set in an intermediate position; the ther-
mostatic valve V (Page 19 Fig. 6) has less effect on the combustion air
than the fully automatic setting.
- 19
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