ENGLISH
11
8. ELIMINATING FUMES DISCHARGE
Fumes discharge must comply with regulations in force and must therefore be brought above the roof. The
discharge tube must be made out of smooth steel with silicon washers and not be corrugated flexible type.
Furthermore it must be positioned externally and not in closed or semi-closed spaces. For example: garages,
narrow corridors, under closed roofs or any other place where fumes may collect in case of leaks. When
connecting the boiler to a flue, make sure, with a professional chimney sweep, that the flue is perfectly whole..
Oppositely it is absolutely obligatory to encase the existing flue with material which is suitable enough to ensure
correct functioning (see fig.7) The flue must not lean against the fan. It is necessary to assess the layout and
structure of the house once the flue has been installed via walls and the roof, to ensure that installation has
been done correctly and is in conformity with fire safety regulations. You should also check: the internal section
of the flue, that there are no obstructions or material used to build it, the height, the fittingness of the stack and
the possibility to realise vent holes.
TYPE OF TUBES USED FOR FLUES
Rigid painted steel tubes (at least 1.5 mm thick) , or stainless steel ones (at least 0.5 mm thick), can be used.
The male/female coupling collars must be superimposed by at least 40mm.
DIAMETER OF THE FLUE TUBE
The diameter of the tubes depends on the type of system. The boiler has been designed for tubes with an
80mm diameter, as shown in the table, however in some cases 100mm is advisable. If 100 mm diameter tubing
is necessary, connect it to the boiler using a "T" pipe connection using a
ø
80 -
ø
100 pipe fitting. (see fig. 8)
FLUE
DIAMETER
OPINION
Tube length less than 5 m
80 mm
Correct
Tube length more than 5 m
100 mm (min)
Mandatory
For installations at an altitude of more than
1200 m a.s.l.
100 mm (min)
Recommended
Note: for each 90° curve add 1 m and for each 45° a dd ½ m. The lengths indicated on the table are only relevant for the vertical portion.
Horizontal parts must not exceed 2 m in length.
It is PROHIBITED to install air locks or valves that could obstruct the passage of smoke.
It is obligatory to use a "T" connection tube (see fig.8) with an inspection plug, as a connection between the
boiler and the flue, which will allow both the collection of soot that is deposited inside the tubes and periodical
cleaning of the flue, without the need to dismantle. Since the fumes are under light pressure, ensuring that the
plug for cleaning the flue is perfectly airtight is mandatory and it must be the same after each inspection. One
must remember put it back as it was originally and check the condition of the gasket. Verify that the various
tubes are connected properly, as instructed by the manufacturer.
It is strongly advised not to place tubes horizontally, but if absolutely necessary make sure they are placed with
an angle of at least 5%.
If a traditional flue is used it is possible to connect without the need for a "T" connection tube but you must
check that the flue has a bow for collecting ash.
It is advisable connect to the boiler with a horizontal track that is not more than 1m long.
If proper tube lengths are obeyed, the flue should have a draught between 6 and 8 Pa.
Do not change flue tube size in the middle of the route and especially after a bend or a horizontal portion. Verify
that there are no constrictions in the discharge conduit or in the flue.
