49
the following requirements:
– Be gas-tight to the combustion pro-
ducts, waterproof and thermally
insulated.
– Be built of materials suitable for
keep resisting to normal mechanical
stresses, heat, and the action of
combustion products and their pos-
sible condensates.
– Follow a vertical path and not pre-
sent any throttling throughout its
entire length.
– Be adequately insulated to prevent
phenomena of condensation or
smokes cooling, in particular if loca-
ted outside the building or in unhea-
ted ambiences.
– Be set at an adequate distance
from combustible or easily inflam-
mable material by means of an air
gap or suitable insulating material.
– Have beneath the mouth of the first
smoke duct a chamber for collecting
solid material and any condensate;
the height of the chamber must be
at least 500 mm.
Access to the chamber must be
guaranteed by means of an opening
provided with an air-tight metal door.
– Have a circular, square, or rectangu-
lar internal cross section; in the
case of square or rectangular sec-
tions, the corners must be rounded
off with a radius of not less than 20
mm. However, hydraulically equiva-
lent cross sections are allowed.
– Be equipped with a chimney-pot at
the top, which must be outside the
so-called back-flow zone, so as to
prevent the formation of back-flow,
which prevents free discharge of
the products of combustion into the
atmosphere.
Therefore, conform to the minimum
heights indicated in fig. 4.
–
Be devoid of mechanical means
of suction located at the top of
the pipe.
– No overpressure should be present
in a chimney that passes within or
close up to inhabited rooms.
2.5.1 Sizing of flue
The correct sizing of the flue is an
essential condition for efficient boiler
operation.
The main factors to be taken into con-
sideration for calculating the section
are the heat input of the boiler, the
type of fuel, the percentage of CO
2
,
the mass flow of smoke at nominal
load, the temperature of the smoke,
the roughness of the internal wall, and
the effect of gravity on the draught
pressure, which must take into
account the external temperature
and the altitude.
2.6 ELECTRICAL
CONNECTION
The boiler is supplied with an electric
cable. Should this require replace-
ment, it must be purchased exclusi-
vely from SIME. The electric power
supply to the boiler must be 230V-
50Hz single-phase through a fused
main switch, with at least 3 mm spa-
cing between contacts.
The room stat must be class II as spe-
cified by standard EN 60730.1 (clean
contact).
NOTE: Device must be connected to
an efficient earthing system.
SIME declines all responsibility for
injury or damage to persons, ani-
mals or things, resulting from the
failure to provide for proper
earthing of the appliance.
Always turn off the power supply
before doing any work on the electri-
cal panel.
2.6.1 Control system
connection (optional)
In the electrical circuit a series of con-
nectors are provided for the installa-
tion of an optional control system,
marked by different colours black, red
and brown (fig. 5).
Tetto piano
0,50 m
0,50 m
Volume
tecnico
> 5 m
≤ 5m
Colmo
> 1,50 m
≤ 1,50 m
Zona di reflusso
1,50 m
2 m min.
0,50 m
oltre il colmo
45°
Tetto a 45°
Colmo
> 1,30 m
≤ 1,30 m
Zona di reflusso
0,80 m
1,20 m min.
0,50 m
oltre il colmo
30°
Tetto a 30 °
Flat roof
30° roof
45° roof
Fig. 4
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