Installation & Servicing instructions ATAG iC-Range
27
Example:
An iC28 with a
concentric fl ue gas system
ø60/100mm has according
to the table a maximum fl ue
straight length of 18m In the
system that is going to be put
in there are 2 x 45° bends, so
the maximum fl ue gas length
is 18 – ( 2 x -1.0 ) = 16m.
9.8.2 Dimensioning of the fl ue gas and air intake duct
The total length of the run of the fl ue is determined by the fl ue diameter, including for the connection pipe,
elbows fi ttings and terminal covers etc..
An incorrect dimensioned fl ue system can lead to disorders. Look at table 9.8.2.a for the choice of the boiler
and the corresponding maximum equivalent fl ue length.
Explanation table 9.8.2.a:
Concentric fl ue gas system:
maximum noted length L = distance between boiler (from elbow or vertical adapter) and the end of terminal
When using bends the noted value behind every bend should be deducted from the maximum straight
length. See example.
Flue dimensions
Rear Flue B (mm)
Min Max
Telescopic fl ue (FA100105) 280 430
Side Flue B + C (mm)
Min Max
Telescopic fl ue (FA100105) 285 435
Dimensions fl ue gas system and air supply system
Concentric fl ue system ø60/100 (Horizontal & Vertical)
Type iC 24 iC 28 iC Economiser Plus 27 iC 36 iC 40 iC Economiser Plus 35 iC Economiser Plus 39
Maximum equivalent length (L) m 13 6
45° bend resistance length m -1.0 -1.0
87° bend resistance length m -1.6 -1.6
Concentric fl ue system ø80/125 (Horizontal & Vertical)
Type iC 24 iC 28 iC Economiser Plus 27 iC 36 iC 40 iC Economiser Plus 35 iC Economiser Plus 39
Maximum equivalent length (L) m 50 45
45° bend resistance length m -1.9 -1.9
87° bend resistance length m -3.0 -3.0
Tabel 9.8.2.a
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