34
Flue gas system
Requirements and regulations
Materials
Flue gas data
Notes
The tables below give guidance on the maximum lengths of air and flue gas tubes that may be connected. If a room sea-
led 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.
The radius of any bend used in the flue gas system must not exceed 87.5°.
Walls that are sensitive to heat should be insulated.
Construct the flue system in such way that no recirculation may take place.
When the boiler is op erational, it produces a white plume of condensation. This condensation plume is harm-
less but may cause some inconvenience, particularly in the case of wall terminal. As a result, roof terminals are
preferred. In a closed installation, roof terminals should be at the same height preventing flue gas from being
sucked in by the other boiler (recirculation). Outlets in recesses and near erected walls may also bring about
flue gas recirculation. Recirculation has to be prevented at all times.
For installation in UK please refer to installation guidance in BS6644 and IGE UP10.
Dimensioning (reference value)
Tube size
Maximum length in metres (roof terminal not included)
Changes of direction
0
2
3
4
60
Ø100 mm
82
78
76
74
70
60
56
54
52
100
34
30
28
26
120
17
13
11
9
140
16
12
10
8
170
Ø130 mm
35
30
27
25
200
30
25
22
20
Tube size
Maximum length in metres (roof terminal included)
Changes of direction
0
2
3
4
60
Ø100/150 mm
14
11
9
8
70
14
11
9
8
100
12
9
7
6
120
8
5
3
2
140
9
6
5
3
Required minimum (flue enclosure) shaft cross
-
section
Diameter flue duct
Square shafts
Round shafts
100 mm
140 x 140 mm
160 mm
Содержание XL-F 105
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Страница 49: ...49 Boiler installation Electrical connection Cascade control...
Страница 65: ...65 Accessories Hydraulics Single boiler Dimensional sketch for 3905173 LLH dT10 20K FLOOR STANDING TLPLUS...
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