FERROLI F30
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3.02 Restrictor
For boiler operation, the restrictor supplied with the unit must be mounted following the instructions below.
Determine the correct size of fl ue restrictor required. Before inserting the fl ue gas duct in the boiler, check that
the restrictor fi tted is correct and that it is correctly positioned (see fi g. 13).
Holes Ø : 47 50 52
Ø
F
ig.
13
Choice of restrictor:
• With concentric pipes: - up to 1m long + one bend, use the 52 mm restrictor.
- for fl ue lengths over 1 metre, use no restrictor.
• With 2 pipe system: - Calculate the total fl ow resistance of the air and fl ue pipes in metres
(cap. 3.04.2)
- utilise the table shown below to choose the more suitable restrictor for
the fl ow resistance calculated
RESTRICTOR FOR TWO PIPE SYSTEM
ON FERROLI F30
Total flow resistance
of flue system
Use
restrictor
size
minimum maximum mm
0 m 20 m 47
m020 m 35 m 50
35 m 45 m 52
45 m 50 m no restrictor
N.B.: the diameter of the hole is stamped
on the restrictor
No restrictor is required for back
outlet fl ue
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