Ariston COMBI A 24 MFFI, Operating Instructions Manual

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For coaxial systems, the maximum development value, mentioned in the table above also takes into account an elbow.
For twin flue systems the maximum development value, mentioned in the table includes the exhaust gas/air intake terminal.
Type 5 outlets should respect the following instructions:
1- Use the same ø 80 mm flue pipes for the air intake and exhaust ducts.
2- If you need to insert elbows in the air intake and exhaust ducts, you should consider for each one the equivalent length to be
included in the calculation of developed length.
3- The exhaust duct should extend above the roof by at least 0.5 m.
4- The intake and exhaust ducts in Type 5 must be installed on the same wall, or where the exhaust is vertical and the air
intake horizontal, the terminals must be on the same side of the building.
TABLE
A
Concentric outlet
60/100
Min length Max. length
Length
equivalency for
24 , 30 and 35 kW
(Type 1, Type 2, Type 3)
0.3 m 5m
45 o
elbow
0.5 m
90 o
elbow
1 m
TABLE
B
Concentric outlet
80/125
Min length Max. length
24 , 30 and 35 kW
(Type 1)
0.3 m 10 m
45 o
elbow
0.5 m
24 , 30 and 35 kW
(Type 2, Type 3)
0.3 m 10 m
90
o
elbow
1 m
TABLE
C
Twin flue outlet
24 , 30 and 35 kW
Min length Max. length
Type 4
80/80
10 m
60 m
(30m air / 30m exhaust)
45 o
elbow
1.4 m
Type 5
80/80
10 m
60 m
(30m air / 30m exhaust)
90 o
elbow
2.2 m
123.5
20
0
10
7
25
Fig. 28
ø
1
0
0
60 mm
In the event that twin flue pipes are used, and the boiler
has a side clearance of less than 60mm from the wall, it
is necessary to cut a larger diameter hole for the flue
pipe, this should be ø100 mm, this will then allow for
easier assembly of the air intake elbow and the tube
outside the wall (see Fig. 29).
Fig. 29
12.4 Fitting the twin pipe flue (Ø80/80) (continued)