rectangular chimneys, the inside
cross section must be 10% greater
than that of the boiler fitting.
*The material used must be water-
proof and resistant to the flue gas
temperatures and acid conden-
sate.
* Mandatory features are low ther-
mal conductivity, adeguate mecha-
nical resistance, perfect seal and
carefully calculated height and
cross section.
* The chimney must be as vertical
as possible, and have a constant
cross section and no throttling.
* The final section must allow effi-
cientemissionofthefluegasunder
all atmospheric conditions.
* The final section must protrude
at least 50 cm above any adja-
cent structure within a five-metre
radius.
3.2.6 Choosing and installing
the burner
When choosing a burner for the
boiler, make sure the features are
compatible with the rated features
of the boiler.
The burner must bear the CE
mark.
The burner must be fixed into the
front panel of the boiler using four
screws: the panel comes with four
M8 threaded holes on a 150 mm
diameter circumference.
If the burner uses a different fixing
method, an adapter needs to be
used. The maximum diameter of
the burner head is 108 mm. The
standard insulation hole is 83 mm
(for models 23, 33 and 43) and
103 mm (for models 53, 63 and
73). If the burner head has a lar-
ger diameter, widen the hole in the
insulation. If it is smaller, add extra
insulation to protect the burner
from the flame (pic. 5).
WARNING
Insulating material adjustment,
when needed, must be made
with the utmost care in order
not to damage the insulating
material itself.
Theboilerisequippedwith a univer-
sal seven-pole plug for the electric
connection of the burner (pic. 6).
3.2.7 Measuring combustion
efficiency
Proceed as follows to determine
combustion efficiency:
* Measure the combustion air tem-
perature.
* Measure the flue gas temperatu-
re and percentage of CO2through
the hole in the flue gas duct.
Take the readings when the boi-
ler is running at a steady state.
3.2.8 Connecting to the gas
mains (for boilers with gas bur-
ners)
The cross section of the gas sup-
ply pipe must be equal to or grea-
ter than that of the burner.
Comply with the applicable stan-
dards and laws on boiler instal-
lation, which are considered an
integral part of this handbook.
Perform a gas tightness test before
starting up an indoor gas sup-
ply system and connecting to the
meter.
If the system has any concealed
parts, the tightness test must
be carried out before covering
the pipes.
The tightness test must not be
carried out with combustible
gas. Use air or nitrogen.
When there is gas in the pipes,
never use a naked flame to
detect gas leaks. Use a suitable
product available from the
trade.
3.2.9 Connecting to the fuel oil
supply system (for boilers with
an oil burner)
The fuel oil supply pipeline must
be perfectly watertight. In particu-
lar, there must be no infiltration
of air along the pipe leading from
the tank. It is advisable to supply
the burners using two pipes, from
tanks positioned at a height of +4
metres (by gravity) to –5 metres
(by suction).
For higher values, it is necessary
to install a pressure reducer or an
auxiliary pump, respectively.
With tanks operating by gravity or
fuel oil systems having an auxi-
liary pump, it is mandatory to fit an
additional shutoff solenoid valve
that closes automatically when the
burner switches off automatically.
If the boiler is installed in a particu-
larly cold area, use fuel oil with a
low paraffin content. If necessary,
fit the burner with a fuel oil pre-
heating system.
It is also advisable to install a
filter for oil.
3.2.10 Connecting to the power
mains (pic. 7, 8, 9, 10)
These boilers are supplied with a
terminal for connecting a three-
wire mains lead, and a cable clip to
prevent it from being torn away.
The boiler must be connected to a
230V-50Hz power mains.
Make sure the positive, negative
and neutral wires are connected
properly.
11
pic. 6
Loading
tap
7- pole
plug
pic. 5
ø 83-103
insulation hole
standard diameter
ø 108
max diameter of
burner head