73
IT
ES
PT
GB
2.8
INSTALLATION SEPARATE
PIPES ø 80
When installing the pipes, follow closely the
requirements of the current standards, as
well as the following practical pointers:
– With direct intake from outside, when
the pipe is longer than 1 m, you are
recommended to insulate the piping so
as to prevent formation of dew on the
outside of the piping during particularly
hard periods of the year.
– With the outlet pipe outside the building
or in cold indoor environments, insulation
is necessary to prevent burner failure in
starting.
In such cases, provide for a condensate-
collector system on the piping.
– If a segment of the flue passes through a
flammable wall, this segment must be
insulated with a glass wool pipe insulator
3 0 m m t h i c k , w i t h a d e n s i t y o f 5 0
kg/m
3
.
The maximum overall length of the intake
and exhaust ducts depends on the head
losses of the single fittings installed and
must not be greater than 7.6 mm H
2
O.
For head losses in the fittings, refer to
Table
1
and example fig. 6/a.
2.8.1
Separate
flue kit
(fig. 8)
The separate flue kit code 8089904 is
supplied with an intake diaphragm which
must be used as shown in fig. 8/a, depen-
ding on the maximum load loss permitted
in both flues.
Example of allowable installation calculation in that the sum of the head losses of the single
fittings is less than 7.6 mm H
2
O:
Intake
Outlet
7 meter horizontal pipe ø 80 x 0.20
1.40
–
7 meter vertical pipe ø 80 x 0.30
–
2.10
n° 2 90° elbows ø 80 x 0.30
0.60
–
n° 2 90° elbows ø 80 x 0.40
–
0.80
n° 1 terminal ø 80
0.10
0.30
Total head loss
2.10
+
3.20 =
5
.
3 mm H
2
O
With this total head loss, remove the segments from n. 1 to n. 7 from diaphragm in the intake
pipe.
180
100
12
5
11
0
16
5
92
Ø 80
Ø 80
1
2
3
4
Fig. 8
Fig. 8/a
KEY
1
ø125/95 sponge seal
2
Fixing screw
3
Flue outlet flange
4
Inlet air diaphragm
TABLE 1
Accessories ø 80
Load loss (mm H
2
O)
“25 BF TS”
Intake
Outlet
Roof out. Intake
90° curve MF
0,30
0,40
–
45° curve MF
0,20
0,30
–
Extension L. 1000 (horizontal)
0,20
0,30
–
Extension L. 1000 (vertical)
0,30
0,20
–
Outlet terminal
–
0,30
–
Intake terminal
0,10
–
–
Manifold
0,20
–
–
Roof outlet terminal L.1390
–
–
0,50
Condensation collection T
–
1,00
–
N° segments
Total load loss mm H
2
O
to remove
“25 BF TS”
none
0 ÷ 0.8
n° 1
0.8 ÷ 1.6
n° 1 e 2
1.6 ÷ 2.4
da n° 1 a 3
2.4 ÷ 3.1
da n° 1 a 4
3.1 ÷ 3.8
da n° 1 a 5
3.8 ÷ 4.5
da n° 1 a 6
4.5 ÷ 5.2
da n° 1 a 7
5.2 ÷ 5.8
da n° 1 a 8
5.8 ÷ 6.4
da n° 1 a 9
6.4 ÷ 7.0
da n° 1 a 10
-
without diaphragm
7.0 ÷ 7.6
Fig. 6/a
