Ferroli SIGMA, Installation And Servicing Instructions

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15
Sigma
2.07 Restrictor and max fl ue length
2.07.01 Concentric Flue System
First table below shows the maximum flue lengths available for boilers with concentric systems.
For correct calculation remember to include the reduction for bend and flue terminals listed on second table.
Reduction for bend
100 mm concentric bend 90
°
100 mm concentric bend 45
°
125 mm concentric bend 90
°
125 mm concentric bend 45
°
1 m
0,5 m
0,5 m
0,25 m
Maximum flue
length permissible
100 mm concentric
Vertical *Horizontal
125 mm concentric
Vertical *Horizontal
100 mm
concentric
back exit
Sigma 60/100 4 m 3 m 5 m 5 m 1 m
*
For horizontal flueing the reduction for appliance bend are already included.
Sigma
60-100
A
B
C
Restrictor pipe
configuration
L 2m
L 2m
1m 2m L
L 1m
Ø47
Ø43
Ø 47
Ø 43
No restrictor
L 1m
No restrictor
L 2m
3m
L 3m
No restrictor
Boiler is fitted with rear outlet without restrictor.
For instruction on changing restrictor for top outlet, refer to step 7-10 at pages 13.
L (max. 3 m.
)
L (max. 1 m.
)
Fig. 34 Fig. 35
To calculate the restrictor, identify your flue pipe configuration (A, B or C) and
choose the correct restrictor diameter from the restrictor table below.
L (max. 4 m.)
Fig. 36
A
Horizontal concentric
B
Back concentric
C
Vertical concentric