Atag iR 15 - Dimensioning Of The Flue Gas And Air Intake Duct

Installation & Servicing instructions ATAG iR-Range
26
Example:
An iR24 with a
concentric ue gas system
ø60/100mm has according
to the table a maximum ue
straight length of 18m In the
system that is going to be put
in there are 2 x 45° bends, so
the maximum ue gas length
is 18 – ( 2 x -1.0 ) = 16 m.
L
9.6.2 Dimensioning of the ue gas and air intake duct
Thetotallengthoftherunoftheueisdeterminedbytheuediameter,includingfortheconnectionpipe,
elbowsttingsandterminalcoversetc..
Anincorrectdimensioneduesystemcanleadtodisorders.Lookattable9.6.2.aforthechoiceoftheboiler
andthecorrespondingmaximumequivalentuelength.
Explanation table 9.6.2.a:
Concentric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.
Flue dimensions
Rear Flue B (mm)
Min Max
Telescopicue(FA100105) 280 430
Side Flue B + C (mm)
Min Max
Telescopicue(FA100105) 285 435
Rear Flue
L = wall thickness (B) + 150mm
Side Flue
L = wall thickness (B) + distance between boiler and wall (C) + 150mm
IfthelengthLismorethan580mmrearueor585mmsideue,thena
Horizontaluexedlength1000mm(60/100mm)withelbow(FA100205)
will need to be used instead, up to 810mm.
L
Figure 9.6.2.b
Dimensions ue gas system and air supply system
Concentric ue system ø60/100 (Horizontal & Vertical)
Type iR 15 iR 18 iR
24 iR 32 iR 40
Maximum equivalent length (L) m 18 6
45° bend resistance length m -1.0 -1.0
87° bend resistance length m -1.6 -1.6
Concentric ue system ø80/125 (Horizontal & Vertical)
Type iR 15 iR 18 iR
24 iR 32 iR 40
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 9.6.2.a