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2. 1 0
SEPARATE DUCTS (C type)
TYPE FOR INDOOR
INSTALLATION
During installation, the provisions pursuant
to Standards and certain practical advice
should be followed:
– With direct aspiration from the external
environment, ducts with a length of more
than 1 meter should be insulated in
order to avoid the formation of dew on
the outer surface of the pipes, especially
in cold weather.
– Discharge pipes fitted outside the buil-
ding or in cold environments must be
insulated, otherwise the burner may not
start up. In such cases, a condensation
collection system must be fitted onto the
pipes.
– If the duct passes through flammable
walls, insulate the stretch of the fumes
discharge duct concerned with a fiber-
glass covering 30 mm thick, density 50
kg/m
3
.
The overall maximum length, i.e. the sum
of the length of the aspiration and of the
discharge pipes, depends on the charge
loss of the single accessories inserted
(excluding the splitter) and must not
exceed 10,5 mm H
O in model "25 BF
2
TS2" - 14 mm H
O in model "30 BF TS2".
2
For charge losses of accessories, refer to
Table 2.
2. 1 0. 1 Accessories separate ducts
A kit is supplied to realise this type of drain,
code 8093000 (fig. 10).
To mount the kit onto the ø 60/100 con-
nection, code 8093101 use t he long
68
TABLE 2
Accessories ø 80
90° elbow MF
45° elbow MF
Extension L. 1000 (horizontal)
Extension L. 1000 (vertical)
Outlet terminal
Intake terminal
Doubler fitting
Roof outlet terminal L. 1390
Tee condensation outlet
Example of allowable installation calculation "25 BF TS2" version in that the sum of the
head losses of the single fittings is less than 10.5 mm H
8 meter horizontal pipe ø 80 x 0,20
8 meter horizontal pipe ø 80 x 0,30
no. 2 90° elbows ø 80 x 0,30
no. 2 90° elbows ø 80 x 0,40
no. 1 terminal ø 80
Total head loss
With this total pressure drop, remove no. 5 sectors of the ø 38 diaphragm.
262
KEY
1
Sponge-rubber gasket ø 125/95
2
Fixing screw
3
Air-smoke flow splitting
unit with take-off point
4
Sectors of diaphragm ø 35
5
ø 60/100 connection
Head loss (mm H
"25 BF TS2"
Inlet
Outlet
Roof outlet
0.30
0.40
–
0.20
0.30
–
0.20
0.30
–
0.30
0.20
–
–
0.30
–
0. 1 0
–
–
0.20
–
–
–
–
0,50
–
1.00
–
O:
2
Intake
Outlet
1.60
–
2.40
0.60
–
0.80
0. 1 0
0.30
2.30
+
3.50
KEY
1
Air-smokes flow splitting unit
with take-off points
2 a 90° elbow MF (6 pz.)
2 b Isolated 90° elbow MF
3 a Extension L. 1000 (6 pz.)
3 b Isolated extension L. 1000
3 c Extension L. 500 (6 pz.)
4
Outlet terminal
5
Int-ext ring nuts kit
6
Intake terminal
7
45° elbow MF (6 pz.)
8
L. 135 condensate recovery tank
9
ø 60/100 connection
Fig. 10
O)
2
"30 BF TS2"
Inlet
Outlet
Roof outlet
0.30
0.50
–
0.20
0.40
–
0.20
0.40
–
0.30
0.30
–
–
0.40
–
0. 1 0
–
–
0.30
–
–
–
–
0.60
–
1. 1 0
–
–
–
=
5.8 mm H
O
2
code 8093000
code 8077410
code 8077408
code 8077309
code 8077306
code 8077308
code 8089501
code 8091500
code 8089500
code 8077411
code 8092800
code 8093101
Fig. 12/a
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