14
type B22
type C12
type C82
type C32
type C42
type C52
3.2.7. Air/flue gas system confi-
guration
B22
This boiler is intended for connection to
an existing flue gas system either inter-
nal or external to the boiler room. Com-
bustion air is taken directly from the
boiler room while flue gas is conveyed
to the outside.
The boiler
must not
be fitted with an
anti-wind gust device, it has to be
equipped with a fan, to be mounted af-
ter the combustion chamber/heat
exchanger.
C12
This boiler is intended for connection
to horizontal outlet and intake ducts,
connected to the outside by means of
coaxial or split ducts.
The distance between the air intake
duct and the flue gas outlet duct is to
be a minimum of 250 mm (see picture
to the right) and both terminals must
be positioned within a squared area
having 500 mm sides.
C32
This boiler is intended for connection
to vertical outlet and intake ducts con-
nected to the outside by means of coa-
xial or split ducts.
The distance between air intake duct
and flue gas flue duct is to be a mi-
nimum of 250 mm (see picture to the
right) and both terminals must be po-
sitioned within a squared area having
500 mm sides.
C42
This boiler is intended for connection
to a collective chimney pipe system
which includes two ducts, air intake
and flue gas exhaust.
These ducts may be coaxial or split.
The flue gas collective chimney system
must comply with current standards.
C52
Boiler with separate air intake and flue
gas discharge pipes. Air and flue gas
may operate to different pressure va-
lues. Air and flue gas terminals may not
face each other from opposite walls.
C82
The boiler is intended to be connected
to an air terminal and to a single flue
gas terminal or to a collective chimney
system.
The flue gas collective chimney system
must comply with current standards.
