Baxi BPI-Eco 1.250, Manual

Page: 32 / 40

32
4.1 BOILER ROOM
Check that the room has the requirements
and features in accordance to the rules in
force. Furthermore, the room should be
aired, in order to have a regular combustion.
Therefore it is necessary to practice some
openings in the walls of the room, which cor-
respond to the following requirements:
– They should have a free section of at
least 6 cm 2 for each 1,163 kW (1000
kcal/h). The minimum opening section
shouldn’t be smaller than 100 cm
2 . The
section can also be calculated, using the
following ratio:
where “S” is expressed in cm 2 .
“Q” is expressed in kcal/h
– The opening should be situated on the
lower part of an outer wall, preferably on
the opposite of the one for the combu-
stion gas discharge.
4.1.1 Positioning in the power station
(fig. 4)
The boiler must be installed on a non-com-
bustion base.
Once the boiler has been installed, it must
be horizontal and stable, in order to reduce
any vibrations and noise.
Always leave free space behind the boiler,
so as to allow opening and maintenance on
the fan.
CAUTION: The minimum distances indica-
ted in the figure are bounding and only
refer to models with power exceeding 35
kW.
4.2 CONNECTION TO THE FLUE
A flue should correspond to the following
requirements:
– It should be of waterproof material and
resistant to temperature of smokes and
related condensations.
– It should be of a sufficient mechanical
resistance and a weak thermal conducti-
vity.
– It should be perfectly hermetic in order
to avoid cooling of the flue.
– It should have the most possible vertical
process and the terminal part should
have a static aspirator, which assures an
efficient and constant discharge of the
combustion product.
– In order to avoid the wind creating a very
high pressure around the chimneypot,
so that it prevails on the ascensional
force of the combustion gas, it is neces-
sary that the discharge orifice hangs
over at least 0,4 meters of whatever
structure adjacent the chimney itself
(including the roof ridge) of at least 8
meters.
– The flue shouldn’t have a diameter infe-
rior to the boiler connection; for flues
with square or rectangular sections, the
internal section should be higher than
10% compared to the boiler connection
one.
– The net section of the flue can be obtai-
ned from the following ratio:
S section resulting in cm 2
K reduction coefficient:
– 0,045 for wood
– 0,030 for carbon
P boiler capacity in kcal/h
H height of the chimney in meters
measured from the flame axis at the
exhaust of the chimney in the atmo-
sphere. For the dimensioning of the
flue you should consider the effecti-
ve height of the chimney in meters,
measured from the flame axis at the
top, diminished with:
– 0,50 m for each direction chan-
ging of t he connection tube
between boiler and flue;
– 1,00 m for each horizontal deve-
lopment meter of the connection
itself.
4.3 CONNECTION OF THE PLANT
The connections should be easily disconnec-
ted by means of pipelines with revolving
joints. It is always advisable to assemble sui-
table interception shutters on the piping of
the heating installation.
CAUTION: It is obligatory to assemble
safety valves on the system not included in
supply.
4.3.1 Filling the system
Before connecting the boiler, it is good
practice to make water circulate inside
the pipes to remove any foreign body that
can compromise the proper operation of
the apparatus.
The filling operation must be carried out
slowly to allow air bubbles to exit from the
specif ic vents placed on t he heating
system.
In closed circuit heating systems, the cold
loading pressure of the system and the
pre-inflating pressure of the expansion tank
must correspond, or at least not be lower
than the height of the system static column
(e.g., for a 5 m static column, the pre-load
pressure of the tank and the load pressure
of the system must correspond to the mini-
mum value of 0.5 bars, at least).
4.3.2 Features of the feed water
The heating circuit supply water must be
treated in compliance with Standard UNI-
COI 8065.
Remember that even small deposits of few
millimetres thick cause a considerable
over-heating of the boiler walls, resulting in
serious consequences.
THE TREATMENT OF THE WATER USED
FOR THE HEATING INSTALLATION IS ABSO-
LUTELY NECESSARY IN THE FOLLOWING
CASES:
– Very vast plants (with high water con-
tents).
4 INSTALLATION
Q
S =
100
P
S = K
√
H
600
1300
1000
600 600
1000
BAXI
Fig. 4