12
Version CTFD (type B23; C53; C83)
The heating unit version CTFD (Types B23, C53 and C83) has a
female fitting at the back with an 80 mm lip seal for connecting to
a combustion air intake pipe.
Combustion air must be taken from outside the room in which the
heating unit is installed by means of a suitable pipe.
The maximum length of this pipe is given in the technical data
sheet.
When using bends, remember that a wide radius 90° curve is, in
term of load losses, equivalent to a straight section of pipe 1 metre
long, and a narrow radius 90° curve is equivalent to a straight pipe
1.5 metres long.
When flue gas is discharged through vertical and horizontal pipes
diameter 120 mm, and with through wall discharge, when allowed,
the maximum length of the discharge pipes is shown in the tech-
nical data sheet.
When using bends, remember that a wide radius 90° curve is, in
term of load losses, equivalent to a straight section of pipe 1 metre
long, and a narrow radius 90° curve is equivalent to a straight pipe
1.5 metres long.
IMPORTANT
Only enamelled or stainless steel pipes with trade or The ma-
nufacturer gaskets must be used for flue gas discharge.
With vertical pipes, a special section is required for conden-
sate discharge.
All the installations both versions CTF and CTFD require a
special section in the link to the flue allowing measurement of
the flue gas temperature and CO2 percentage. This is so that
the burner can be set correctly and the combustion efficiency
determined.
IMPORTANT
When running pipes through walls made of flammable mate-
rial, make sure the discharge pipe has suitable thermal insu-
lation (min. 50 mm).
IMPORTANT
When flue gas system is discharged through pipes diameter
125 mm, it is compulsory to install on the air intake pipe an 80
mm diameter terminal similar to those used for the flue gas
discharge of wall-hung boilers.
3.2.7 Types and classification of air intake and flue gas di-
scharge pipes
Type B23
Discharge through the wall (if allowed by the installation standar-
ds) or through the roof or via the boiler flue. The relevant data is
shown on the technical data sheet, which complies with current
standards.
Type C83
Connection to the chimney compatible with type C83.
Type C53
The end sections of the air intake and flue gas discharge pipes
must never be in opposing walls.
Refer to the table in subsection 2.2.
model C23
Max equivalent length of discharge pipe Ø 120 mm: 5 metres
Each added wide radius 90° bend equals 1 metre discharge
Each added narrow radius 90° bend equals 1.5 metre discharge
model C33
Max equivalent length of discharge pipe Ø 120 mm: 4 metres
Each added wide radius 90° bend equals 1 metre discharge
Each added narrow radius 90° bend equals 1.5 metre discharge
model CTFD 23
Max equivalent length
of air intake pipe Ø 80 mm
Max equivalent length
of discharge pipe Ø 120 mm
< 1 m
up to 5 m
from 1 to 6 m
up to 6 m
from 6 to 7 m
up to 7 m
Each added wide radius 90° bend equals 1 metre both air intake and discharge
Each added narrow radius 90° bend equals 1.5 metre both air intake and discharge
model CTFD 33
Max equivalent length
of air intake pipe Ø 80 mm
Max equivalent length
of discharge pipe Ø 120 mm
from 0 to 4 m
up to 4 m
from 4 to 6 m
up to 6 m
from 6 to 7 m
up to 7 m
Each added wide radius 90° bend equals 1 metre both air intake and discharge
Each added narrow radius 90° bend equals 1.5 metre both air intake and discharge
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