2.1
BOILER ROOM
The boilers with a rating of more than
35 kW must be equipped with a tech-
nical room whose dimensions and
requirements correspond to the cur-
rent standards and regulations.
The minimum distance between the
walls of the room and the boiler must
not be less than 0.60 m., while the
minimum height between the top of
the boiler and the ceiling must be at
least 1 m. which can be reduced to
0.50 m. for boilers with incorporated
heaters (however the minimum height
of the boiler room must not be less
than 2,5 m).
The boilers with a rating of less than
35 kW can be installed only in perfect-
ly air-vented rooms.
To circulate air in the room, air vents
must be made on the outside walls
which satisfy the following require-
ments:
– Have a total surface area of at least
6 cm
2
for each installed Kw of ther-
mal capacity and however not less
than 100 cm
2
.
– To be situated as close as possible
to the floor, unobstructable and pro-
tected by a grate which does not
reduce the air passage area.
2.2
CONNECTING UP SYSTEM
Before proceeding to connect up the
boiler, you are recommended to make
the water circulate in the piping in
order to eliminate any foreign bodies
that might be detrimental to the oper-
ating efficiency of the appliance.
For connecting up the pipes, make
sure to follow the indications illustrat-
ed in fig. 1.
The connections should be easy to dis-
connect using pipe unions with ori-
entable connections.
The shutoff valve must be connected
to a suitable flow system and return
pipes
2.2.1
System filling
The boiler and the relative system
must be filled operating on the bearing
tap and the pressure of cold charging
the system must be included between
1 - 1.2 bar
.
During filling the main switch should
be left open.
Filling must be done slowly so as to
allow any air bubbles to be bled off
through the provided air vents. This
operation can be made easy by posi-
tioning horizontally the incision of the
block screw of the shutoff valve.
Upon completing the filling, put the
screw back to its original position.
At the end of the operation make sure
that the tap is closed (fig. 4).
2.2.2 D.H.W. production on
“DUETTO - AQUA” versions
When hot treated water is required in
the
“DUETTO”
version, the switch
which commutes the diverter valve is
immediately inserted supplying hot
water practically at once.
In order that the boiler be capable of
suppl ying tr eat ed wat er in t he
“AQUA”
version, all the air in the boil-
er’s serpentine must be bled off at
the first ignition.
This operation is made easy by posi-
tioning horizontally the incision of the
block screw of the shutoff valve (3 fig.
2/b). After all the air has been bled
off, put the screw back to its original
position.
2.2.3 Characteristics of feedwater
IT IS ABSOLUTELY ESSENTIAL THAT
THE WATER USED FOR THE CENTRAL
HEATING SYSTEM SHOULD BE TREAT-
ED IN THE FOLLOWING CASES:
– Very extensive systems (with high
contents of feedwater).
– Frequent addition of makeup water
into the system.
– In case it is necessary to empty the
system either partially or totally.
2.3
CONNECTING UP FLUE
The flue is of fundamental importance
for the proper operation of the boiler;
if not installed in compliance with the
standards, starting the boiler will be
difficult and there will be a consequent
formation of soot, condensation and
encrustation.
A flue therefore must satisfy the fol-
lowing requirements:
– be constructed with waterproof
materials and resistant to smoke
temperature and condensate;
– be of adequate mechanical resilience
and of low heat conductivity;
– be perfectly sealed to prevent cool-
ing of the flue itself:
– be as vertical as possible; the termi-
nal section of the flue must be fitted
with a static exhaust device that
ensur es cons t ant and ef f icient
extraction of products generated by
combustion;
– to prevent the wind from creating
pressure zones around the chim-
ney top greater than the uplif t
force of combustion gases, the
exhaust outlet should be at least
0.4 m higher than structures adja-
cent to the stack (including the roof
top) within 8 m;
– have a diameter that is not inferior
to that of the boiler union: square or
rectangular-section flues should
have an int er nal section 10%
greater than that of the boiler union;
– the useful section of the flue must
conform to the following formula:
S
resulting section in cm
2
K
reduction coefficient for liquid
fuels: 0.024
P
boiler input in Kcal/h
H height of the flue in meters mea-
sured from the flame axis to the
flue outlet into the atmosphere.
When dimensioning the flue, the
ef fective height of the flue in
met er s must be considered,
measured from the flame axis to
the top of the flue, reduced by:
– 0.50 m for each change of
direction of the connection
union between boiler and flue;
– 1.00 f or each hor izont al
metre of the union itself.
Our boilers are the B
23
type and do
not need any particular connections
other than the one to the flue as
described above.
45
2
INSTALLATION
Fig. 4
0
°
C
120
20
100
40
80
60
P
S
= K
√
H
OPEN
