65
EN
Split pipe system
The split pipe system is supplied with the combustion air inlet
diaphragm which is to be mounted, after the sections have been
eliminated according to the total load loss which is calculated
by summing the load losses of the inlet ducts to those of the
outlet ducts.
1
2
4
5
3
Fig. 24
KEY:
1
Split pipe system with take-off point
2
Inlet diaphragm
3
Air inlet
4
Smoke outlet
5
Take-off point for smoke analysis
Load loss accessory Ø 80 mm
Description Code
Load loss (mm H
2
O)
Brava One 25 BF Brava One 30 BF
Inlet
Outlet
Inlet
Outlet
90° curve MF 8077410 0,35 0,40 0,45 0,50
45° curve MF 8077411 0,30 0,35 0,40 0,45
Horizontal
extension W. 1000
mm
8077309 0,20 0,30 0,25 0,35
Vertical extension
W. 1000 mm
8077309 0,20 0,10 0,25 0,15
Wall terminal 8089501 0,15 0,50 0,20 0,80
Condensate
recovery Tee
8093300 - 0,80 - 1,00
Roof outlet
terminal (*)
8091200 1,60 0,10 2,00 0,20
(*) The losses of the roof outlet terminal at inlet include the
manifold code 8091400.
NOTE:
for the boiler to operate correctly it is necessary that a
minimum distance of 0.50 m of the duct is respected with a 90°
inlet curve.
Example: calculation of the load loss of a
Brava One 25 BF
boiler.
Accessories Ø 80
mm
Code
Quantity
Load loss (mm H
2
O)
Inlet
Outlet Total
Extension W. 1000
mm (horizontal)
8077309 7 7 x 0,2 - 1,40
Extension W. 1000
mm (horizontal)
8077309 7 - 7 x 0,3 2,10
90° curve 8077410 2 2 x 0,35 - 0,70
90° curve 8077410 2 - 2 x 0,4 0,80
Wall terminal 8089501 2 0,15 0,5 0,65
TOTAL 5,65
(installation permitted since the total of the load loss of the
accessories used is less than 9.0 mmH
2
O).
With this total load loss, sections 1 to 6 (inclusive) must be
removed from the inlet diaphragm (2).
Fig. 25
No. of sections to be
removed
Total load loss (mm H
2
O)
Brava One 25 BF Brava One 30 BF
None 0 ÷ 2,0 0 ÷ 0,8
1 2,0 ÷ 3,0 0,8 ÷ 1,5
1 ÷ 2 3,0 ÷ 4,0 1,5 ÷ 2,4
1 ÷ 3 - 2,4 ÷ 3,2
1 ÷ 4 4,0 ÷ 5,0 3,2 ÷ 4,0
1 ÷ 5 - 4,0 ÷ 4,8
1 ÷ 6 5,0 ÷ 6,0 4,8 ÷ 5,6
1 ÷ 7 6,0 ÷ 7,0 5,6 ÷ 6,5
1 ÷ 8 - 6,5 ÷ 7,3
1 ÷ 9 7,0 ÷ 8,0 7,3 ÷ 7,8
1 ÷ 10 - 7,8 ÷ 8,4
Entire diaphragm 8.0 -
9.0
(*) 8.4 -
9.5
(*)
(*) Maximum load loss permitted.
120
190
190
125
125
Ø 80
K
Fig. 26
Description
Brava One 25 BF Brava One 30 BF
K (mm) 203 221
W (mm) 400 450
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