Sime FORMAT DGT Series - Page 11

72
wall with rounded glass wool 30 mm
thick and with a density of 50 kg/m
2
.
The maximum total length, which is the
sum of lengths of the aspiration and
discharge pipes, is determined by the
loss of charge of the single accessories
inserted and must not result as more
than 9.0 mm H2O in version “25 BF” and
9.5 mm H2O 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 aspi-
ration diaphragm that must be engaged,
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.
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 ( mmH2O)
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
ø 80
ø 80
125
125
Fig. 8
KEY
1 Divider with vent
2 Inlet air diaphragm
3Air intake bend
4 Elbow product discharge
25 BF 30 BF
K mm 203 221
L mm 400 450