23
Flue gas connection
We recommend the use of ELCO’s
comprehensive range of flue gas
components.
For further information, please see the
installation instructions:
- ELCO wall terminals
- ELCO roof terminals
- ELCO flue pipe components, both
individual pipes and concentric
tubes.
Regulations about the construction
and installation of flue gas systems are
different from country to country.
It must be ensured that all national
regulations with regard to chimney
systems are observed.
Notes
The tables below give guidance on
the maximum lengths of air and flue
gas tubes that may be connected. If
a room sealed installation is being
made utilising separate air and flue gas
tubes, the lengths of both tubes must
be added together and not exceed the
relevant value given in the tables.
In all cases, the concentric flue/air
connection on the top of the boiler
case is 80/125. When using 110/150
flue components, an allowance for
the necessary 80/125 to 110/150
adaptor fitting has been included in
the flue lengths indicated in the tables.
The maximum length of any external
section of flue pipe must not exceed
5m.
The radius of any bend used in the flue
gas system must not exceed 87.5°.
Installation
Connections
Air- / flue gas ducts
All boiler models have an ø80/125
concentric flue connection.
Required minimum (flue enclosure) shaft cross-section
Diameter flue duct
Square shafts
Round shafts
80 mm
120 x 120 mm
130 mm
110 mm
140 x 140 mm
160 mm
It is not necessary to install a separate
condensate drain for the flue gas
system, since the condensate will be
flushed out via the boiler and into the
siphon. Please observe the following
recommendations:
- Only use corrosion-resistant
material
- The diameter must be calculated
and selected according to the
national regulations.
- The length of the flue gas system
must be kept as short as possible
(and must not exceed the
maximum permitted length, see the
documentation for planners)
- Horizontal flue gas tubes must have
an inclination of at least 3° back
towards the boiler.
Air supply connection
If required, a separate room sealed
air supply tube may be connected
via the inclusion of the optional air
supply connector fitting. The diameter
must be calculated in conformity with
national regulations and in combination
with the flue gas gas system. The
overall resistance of the air supply
and flue gas tubes may not exceed
the maximum supply pressure of the
Fan at any time. (Also see the Chapter
“Technical data”)
Dimensioning (reference value)
Maximum length in metres of D80 and D110 Ø tubes
(open or parallel tubes room sealed installation)
D 80 mm
D 110 mm
Changes of direction
0
2
3
4
0
2
3
4
13
60
58,6
57,9
57,3
80
79,5
79,3
79,0
19
60
57,6
56,5
55,3
80
79,2
78,7
78,3
24
60
56,5
54,8
53,0
80
78,8
78,1
77,5
Combi 24
60
56,6
54,9
53,2
80
78,8
78,2
77,6
34
30
22,0
18,0
14,0
80
77,1
75,7
74,3
Combi 34
30
22,0
18,0
14,0
80
77,2
75,8
74,4
35L
12
3,6
55
52,0
50,5
49,1
46
12
55
49,9
47,3
44,7
54
11
50
42,9
39,3
35,8
Maximum length in metres for concentric room sealed installations D 60/100, D 80/125 and D 110/150
D 60/100 mm
D 80/125 mm
D 110/150 mm
Changes of direction
0
2
3
4
0
2
3
4
0
2
3
4
13
14
8,8
6,2
3,6
40
38
37
36
40
39
38,5
38
19
14
5
0,5
40
36,6
34,9
33,2
40
38,2
37,3
36,4
24
14
0,6
40
35
32,5
30
40
37,4
36,1
34,8
Combi 24
4
0,6
25
35
32,5
30
40
37,4
36,1
34,8
34
4
25
13,6
7,9
2,2
40
34,2
31,3
28,4
Combi 34
4
25
13,6
7,9
2,2
40
34,2
31,3
28,4
35L
4
12
0,2
40
33,8
30,7
27,6
46
12
30
19,4
14,1
8,8
54
11
30
15,4
8,1
0,8
