Page 13 of 51
6.5.1 Strebel S-CB Flue/Air inlet Resistance table
The output of the boiler is affected by the resistance of the air inlet and flue system. At a resistance up to 250
Pa, the output will be as indicated on the name plate of the boiler
.
See page 12 for higher flue resistance.
Table 1; Resistance table
(mm)
Resistance inlet and outlet system [Pa]
Item
Boiler S-CB
60
80
100
120
150
180
roof terminal
125/80
25
45
X
X
X
X
outside wall terminal
125/80
15
30
X
X
X
X
roof terminal
150/100
12
30
35
40
X
X
Co
-ax
ial
Termina
ls
outside wall terminal
150/100
10
25
28
32
X
X
straight tube/mt
80
4
5,5
8
10
15
24
straight tube/mt
100
1
3
3,5
4
6
9
straight tube/mt
130
0,35
0,75
0,8
1
1,2
2
straight tube/mt
150
X
X
0,3
0,4
0,6
1,0
45° bend
80
2
3
4
5
7.5
12
45° bend
100
0,6
1,5
1,7
2
2,2
4.5
45° bend
130
0,2
0,4
0,4
0,5
0,6
1
45° bend
150
X
X
0,15
0,2
0,3
0,6
90° bend
80
4
5.5
8
10
15
24
90° bend
100
1
3
3,5
4
6
9
90° bend
130
0,35
0,7
0,8
1
1,2
2
(Twi
n )Air
s
u
p
p
ly
90° bend
150
X
X
0,3
0,4
0,6
1,2
straight tube/mt
80
5
8
12
15
20
X
straight tube/mt
100
2
3,5
4
6
9
12
straight tube/mt
130
0,45
0,8
1,2
1,5
2
3
straight tube/mt
150
X
X
0,5
0,5
1
1.5
45° bend
80
2,5
4
6,5
8
14
X
45° bend
100
1
1,7
2
3,2
4.5
6
45° bend
130
0,2
0,4
0,6
0,8
1
1.5
45° bend
150
X
X
0,2
0,4
0,8
1.8
90° bend
80
5
8
12
15
20
X
90° bend
100
2
3,5
4
6
9
X
90° bend
130
0,45
0,8
1,2
1,5
2
3
90° bend
150
X
X
0,5
0,7
1,1
1.5
straight tube/mt
125/80
8.5
11.5
X
X
X
X
straight tube/mt
150/100
2.5
4.5
5
8.0
15
20
45° Concentric bend
125/80
4.2
5.5
X
X
X
X
45° Concentric bend
150/100
1.2
2.2
2.5
4
8
10
90° Concentric bend
125/80
8.5
11.5
16
21
X
X
Co a
x
ial
( T
w
in)
Flue
gas
discha
rg
e
90° Concentric bend
150/100
2.5
4.5
5
8
15
20
*Parallel Roof & wall terminal air inlet/exhaust resistance equals 1 meter straight length of same size
Strebel S-CB Example calculation - Boiler type: S-CB 60
S-CB 60 using a co-axial flue system 125/80, with through the roof terminal.
For the stated output the boiler has 250 Pa fan pressure
Roof terminal = 25 Pa Resistance
25 Pa subtracted from 250 Pa leaves 225 Pa
Each metre length of 125/80 flue has a resistance of 8.5 Pa. 225 divided by 8.5 =26.4
Therefore the above example allows a straight flue run of
26.4
metres.
Reduce this flue run by 1 metre for each 90 degree bend or ½ metre for each 45 degree bend.
See also sample parallel flue calculation on page 16
Install horizontal Flue parts under 1% fall in the direction of the boiler (one centimetre for every
linear metre)
.
Содержание SC-B
Страница 5: ...Page 5 of 51 2 TYPICAL SYSTEM LAYOUTS 2 1 Single Boiler Layout ...
Страница 42: ...Page 42 of 51 14 EXPLODED VIEW DIAGRAMS ...
Страница 45: ...Page 45 of 51 14 2 Burner fan gas pipe heat exchanger casing S CB 150 S CB 180 Figure 5 S CB150 S CB 180 ...
Страница 47: ......
Страница 49: ...Page 49 of 51 14 4 Pipes pump S CB 150 180 Figure 6 S CB 150 S CB 180 ...
