25
DOMITOP HF 24 - 30 E
FERELLA GOLD HF 24 - 30 MEL
Version - 09.2002
Fume ducts
The unit is type C with an airtight chamber and forced draught, the air inlet and fume outlet must be
connected to one of the following extraction/suction systems. With the aid of the tables and methods of
calculation indicated, before commencing installation, it is first necessary to check that the fume ducts do
not exceed the maximum permissible lengths. The current standards and local regulations must be
observed.
This C-type unit must be installed using the fume exhaust and suction ducts supplied by FERROLI
S.p.A. in accordance with UNI-CIG 7129/92. Failure to use them automatically forfeits all warranty
and liability of FERROLI S.p.A.
Diaphragms
Boiler operation requires fitting the diaphragms supplied with the unit as instructed in the following tables.
As the resistance of the fume ducts changes, the diaphragms make it possible to keep the combustion
parameters (CO
2
, etc.) within the optimum operating range. Note that with low-resistance fume ducts, a high-
resistance diaphragm (small hole diameter) is used and vice versa.
Choosing the diaphragm using
separate pipes
Choosing the diaphragm using
coaxial pipes
Type
Coaxial
60/100
Length up to:
1 bend + 1 metre
1 bend + 3 metres
1 bend + 3 metres
1 bend + 4 metres
1 bend + 5 metres
Diaphragm
to use
50 mm
No diaph.
45 mm
50 mm
No diaph.
Coaxial
80/125
HF 24
HF 30
52 mm
No diaph.
50 mm
No diaph.
No diaph.
Pipe length
calculated in
linear metres
Diaphragm
to use
45 mm
47 mm
50 mm
No diaph.
Min
0 m
10 m
20 m
35 m
Max
10 m
20 m
35 m
45 m
HF 24
HF 30
47 mm
50 mm
52 mm
No diaph.
Diaphragm
to use
Min
0 m
15 m
30 m
40 m
Max
10 m
30 m
40 m
45 m
Pipe length
calculated in
linear metres
Boilers are
fitted as standard
with the smallest
diaphragm in the series.
Before inserting the fume outlet pipe, it is
therefore necessary to check there is the right
diaphragm (when it is to be used) and that it is
correctly positioned.
Changing the diaphragm
If inserting or changing a diaphragm, it is necessary to
remove the fan assembly, take out the fume coupling
1
and insert the required diaphragm
2
.
Ø
N.B. The
diameter of
the hole Ø is
stamped on the
diaphragm
2
1
.
.
Supplied by HeatingSpares247.com
