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The end of the gas outlet flex should remain higher than the boiler's output. It is mandatory to install at
least 1,5m flex vertically to create natural current preventing smoke, odours or eventual cut of electric
supply.
Faced with cut of electric supplies and unusual weather conditions (storms, strong winds) it is
recommendable to install an uninterruptible power supply (S.A.I.) which we have available as an option.
If the boiler is installed in a wooden house, the installation of the vertical flex shall be done with isolated
double-wall flex and special attention should be paid to the zone going through the wall, isolated sockets are
mandatory.
4.12.
Distances from doors, Windows, ventilation grids or air input to the house or building:
A
Distance from ventilation grid.
B
Distance from ventilation grid.
C
Lateral side of a door.
D Top of a window.
E
Top of a door.
F
Lateral side of a door.
G Adjacent wall.
H Height from adjacent wall.
I
Adjacent building.
Distances may vary according to the laws of each geographical area.
4.13.
The minimum distance from gas outlet to ground shall be minimum 65cm, depending however on the
surface. Gas may burn grass, plants, trees located near the gas outlet. In the event that the boiler outlet is
lower, suitable safety measures should be taken.
4.14.
The distance between gas outlet and public pavement shall be minimum 2.20 m.
4.15.
The distance to flammable material shall be min. 65cm.
4.16.
Never fix the gas outlet flex in a chimney or a flex already installed which diameter is 4 times as large as the
boiler's flex (Ø80 max. 200cm
the gas outlet must be channeled to the top.
4.17.
Gas outlet flex cannot be installed in a share pipe such as the pipe of an extractor hood.
4.18.
If gas outlet installation pipe has a length higher than 8 meters should be increased every 4 meters one
measure, i.e. the first 4 meters in 80 mm and 100mm in the following and so on if the installation has more
meters. If the length is excessive, it is highly recommended to install a double-walled pipe in order to avoid
condensation.
4.19.
If gas outlet installation is wrong, combustion air's homogeneity might be bad which could make the wall of
the house or the building dirty, aggregate trash inside the boiler and thus be the source of premature
degradation of the spare parts and gas outlet pipe.
4.20.
The air input pipe should not be drained with the risk of affecting the correct operation of the boiler. For this
reason, and in order to facilitate fresh air input, it is necessary to set up a ventilation grid AT NOT LESS than
65cm both horizontally and vertically from gas output, see point 4.12.
Direct air currents shall also be avoided as they might prevent a correct operation of the boiler and as a
consequence, heat performance.
4.21.
In any case the design of the chimney termination will impede the free diffusion in the atmosphere of
combustion products. A metallic mesh with a gap of 3x3 cm can be placed to avoid the entry of birds or
unwanted objects.
4.22.
In general, the evacuation of the combustion must be made in the roof of the building through the chimney.
As exceptional cases, in houses or in residential buildings rehabilitations, it is allowed to evacuate the
combustion products in the facade or the courtyard. In the latter case, the minimum surface conditions must
be followed:
500 mm
500 mm
1250 mm
650 mm
650 mm
1250 mm
300 mm
2300 mm
650 mm
2
with flex of Ø100 max. 314 cm
35
Drawing 2
2
). When installing the boiler in higher section
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