54
2.8
INSTALLATION SEPARATE
PIPES (“GG F 23 - 28 BF” version)
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
30 mm t hick , wit h a density of 50
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
vers. “23 BF” - 9 mm H
2
O vers. “28 BF”.
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.
To use the air intake in this type of outlet
you must perform the following operations
(fig. 9):
Example of allowable installation
“23 BF”
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
Fig. 6/a
TABLE 1
Accessories ø 80
Load loss (mm H
2
O)
“GG F 23 BF”
“GG F 28 BF”
Intake
Outlet
Roof out. Intake
Release
Outlet
Roof out. Intake
90° curve MF
0.30
0.40
–
0.30
0.45
–
45° curve MF
0.20
0.30
–
0.20
0.35
–
Extension L. 1000 (horizontal)
0.20
0.30
–
0.20
0.35
–
Extension L. 1000 (vertical)
0.30
0.20
–
0.30
0.25
–
Outlet terminal
–
0.30
–
–
0.35
–
Intake terminal
0.10
–
–
0.10
–
–
Manifold
0.20
–
–
0.30
–
–
Roof outlet terminal L.1390
–
–
0,50
–
–
0.55
Condensation collection T
–
1.00
–
–
1.05
–
KEY
1 ø125/95 sponge seal
2 Fixing screw
3 Flue outlet flange
4 Inlet air diaphragm
23 BF
28 BF
K mm
180
205
N° segments
Total load loss mm H
2
O
to remove
23 BF
28 BF
none
0 ÷ 0.8
-
n° 1
0.8 ÷ 1.6
-
n° 1 e 2
1.6 ÷ 2.4
0 ÷ 1.0
da n° 1 a 3
2.4 ÷ 3.1
1.0 ÷ 2.0
da n° 1 a 4
3.1 ÷ 3.8
2.0 ÷ 3.0
da n° 1 a 5
3.8 ÷ 4.5
3.0 ÷ 4.0
da n° 1 a 6
4.5 ÷ 5.2
4.0 ÷ 4.8
da n° 1 a 7
5.2 ÷ 5.8
4.8 ÷ 5.6
da n° 1 a 8
5.8 ÷ 6.4
5.6 ÷ 6.4
da n° 1 a 9
6.4 ÷ 7.0
6.4 ÷ 7.2
da n° 1 a 10
-
7.2 ÷ 8.0
without diaphragm
7.0 ÷ 7.6
8.0 ÷ 9.0
K