74
discharge pipes, is determined by the loss
of charge of the single accessories inserted
and must not result as more than 9 .0 mm
H
2
O in version “25 BF” and 9 .5 mm H
2
O in
version “30 BF” .
For the loss of charge of the accessories,
refer to Table 1 and to the example given
in fig . 7 .
2 .8 .1
Air/combustion products
divider (fig . 8 - fig . 8/a)
The air/combustion products divider
cod . 8093020 (fig . 8) is supplied with the
aspiration diaphragm that must be enga-
ged, depending on the maximum head loss
accepted in both ducts, as indicated in fig .
8/a .
2 .8 .2
Outlet systems
(fig . 9)
The diagrams in fig . 9 illustrate a number
of examples of different types of separate
outlets .
2 .9
FORCED EXHAUST
TYPE B22P-B52P (fig . 10)
Fig . 7
Calculation example of the head loss of a “25 BF” vers . boiler (installation allowed as the sum
of the head losses of the accessories used is less than 9 .0 mmH
2
O):
Intake
Outlet
7 meter horizontal pipe ø 80 x 0 .20
1 .40
–
7 meter horizontal pipe ø 80 x 0 .30
–
2 .10
No . 2 90° elbows ø 80 x 0 .35
0 .70
–
No . 2 90° elbows ø 80 x 0 .40
–
0 .80
No . 1
wall terminal
ø 80
0 .15 0 .50
Total head loss
2 .25
+
3 .40 = 5 .65 mmH
2
O
With this total head loss, remove the segments from No . 1 to No . 6 from diaphragm in the intake pipe .
TABLE 1
Accessories ø 80
Load loss (mmH
2
O)
25 BF
30 BF
Intake
Outlet
Intake Outlet
90° elbow MF
0 .35
0 .40
0 .45
0 .50
45° elbow MF
0 .30
0 .35
0 .40
0 .45
Extension L . 1000 (horizontal)
0 .20
0 .30
0 .25
0 .35
Extension L . 1000 (vertical)
0 .20
0 .10
0 .25
0 .15
Wall terminal
0 .15
0 .50
0 .20
0 .80
T-shaped condensation collector
---
0 .80
---
1 .00
Roof exit terminal*
1 .60
0 .10
2 .00
0 .20
* The loss of the roof exit terminal in aspiration concludes the collector code 8091400
1
2
3
4
L
K
120
190
190
¿ 80
¿ 80
125
125
Fig . 8
KEY
1 Divider with vent
2 Inlet air diaphragm
3 Air intake bend
4 Elbow product discharge
25 BF
30
BF
K mm
203
221
Содержание GG BT 25 BF
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Страница 96: ...Cod 6316123 05 11 Documentation Dpt Via Garbo 27 37045 Legnago Vr Tel 39 0442 631111 Fax 39 0442 631292 ...