Benchmark Metropolis DGT 25 BF, Installation And Servicing Instrucnion

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and with a density of 50 kg/m 3 .
The maximum available length is determi-
ned by the sum of the head losses of the
individual components of the flue and
must not result as more than 9.0 mm
H
2
O.
For the loss of charge of the accessories,
refer to
Table 5 and to the example given in
fig. 9.
2.17.4 Twin Adaptor
The twin adaptor code 8093020 (fig. 10) is
supplied with a diaphragm. Segments must
be removed, depending on the maximum
head loss total in both ducts, as indicated
in fig. 10/a.
2.18 ELECTRICAL WIRING
The boiler is supplied with an electric cable.
Should this require replacement, it must be
purchased exclusively from Sime Ltd.
The power supply must be single-phase
230V - 50 Hz through a main switch pro-
15
ENG
IT
ES
Calculation example of the head loss (installation allowed as the sum of the head losses
of the accessories used is less than 9.0 mm H
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 mm H
2
O
With this total head loss, remove the segments from No. 1 to No. 6 from diaphragm in
the intake pipe.
TABLE 5
Accessories ø 80 Load loss (mm H
2
O)
Intake Outlet
90° elbow MF 0.35 0.40
45° elbow MF 0.30 0.35
Extension L. 1000 (horizontal) 0.20 0.30
Extension L. 1000 (vertical) 0.20 0.10
Wall terminal 0.15 0.50
T-shaped condensation collector --- 0.80
Roof exit terminal* 1.60 0.10
* The loss of the roof exit terminal in aspiration concludes the collector code 8091400
Fig. 9
1
2
3
4
L
K
120
19
0
19
0
ø 80
ø 80
12
5
12
5
Fig. 10
KEY
1 Divider with vent
2 Inlet air diaphragm
3 Air intake bend
4 Elbow product discharge
Fig. 10/a
No. segments to remove Total load loss mm H2O
none 0 ÷ 2.0
No. 1 2.0 ÷ 3.0
No. 1 e 2 3.0 ÷ 4.0
from No. 1 to 3 -
from No. 1 to 4 4.0 ÷ 5.0
from No. 1 to 5 -
from No. 1 to 6 5.0 ÷ 6.0
from No. 1 to 7 6.0 ÷ 7.0
from No. 1 to 8 -
from No. 1 to 9 7.0 ÷ 8.0
from No. 1 to 10 -
without diaphragm 8.0 ÷ 9.0
203
400