FALCON II
13
3.02 Restrictor
For boiler operation, the restrictor supplied with the unit must be mounted following the instructions below.
Determine the correct size of flue restrictor required. Before inserting the flue gas duct in the boiler, check that
the restrictor fitted is correct and that it is correctly positioned (see fig. 13).
N.B.: the diameter of the hole is stamped
on the restrictor
Boiler is fi tted with Ø47 restrictor
as standard
Holes Ø : 47 50 52
Ø
Fig. 13
Choice of restrictor:
• With
concentric pipes
: - up to 1m long + one bend, use the 52 mm restrictor.
- for flue lengths over 1 metre, use no restrictor.
• With
2 pipe system:
- Calculate the total flow resistance of the air and flue pipes in metres
(cap. 3.04.2)
- utilise the table shown below to choose the more suitable restrictor for
the flow resistance calculated
