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TFD version (types B23, C53 and C83)
The heating unit, TFD version (types B23, C53 and C83) has a fe-
male fitting at its back, with an 80 mm lip seal for connection to a
combustion air intake pipe. The pipe is already connected to the
burner via a flexible paper-aluminum duct.
Combustion air can be taken from outside the room in which the
heating unit is installed by means of a suitable pipe.
Maximum length of the combustion air pipe is specified in the fol-
lowing technical data charts.
Flue gas discharge system is to be implemented by means of 120
mm diameter pipes, vertical and horizontal, and wall terminal when
laws and regulations allow it; maximum length of the flue gas pipe
is specified in the following technical data charts.
When bends are necessary in the combustion air system, bear in
mind that a wide radius 90° bend, in term of load losses, is equiva-
lent to a 1 meter long straight section of pipe, and a narrow radius
90° bend is equivalent to a 1.5 meter long straight pipe.
N.B.
Only enameled steel or stainless steel pipes with gaskets from
the manufacturer or available on the market, are to be used as
flue gas discharge system.
In presence of vertical flue gas discharge pipes, provide a spe-
cific section for condensate discharge.
All the installations (both TF and TFD versions), require a spe-
cific section linked to the flue gas discharge pipe, allowing for
measurement of flue gas temperature and CO2 concentration,
so that the burner can be correctly adjusted and the combu-
stion efficiency verified.
N.B.
When routing through flammable walls, provide the flue gas
discharge pipes with suitable thermal insulation (50 mm mini-
mum thickness).
N.B.
When flue gas is discharged through 120 mm diameter pipes,
it is mandatory to install on the air intake pipe the provided 80
mm diameter terminal.
Types and classification of air intake and flue gas discharge systems
Type B23
Discharge through the wall (when allowed by applicable installation
standards) or through the roof or via chimney system dedicated to
the boiler only.
Type C53
The air intake terminal and flue gas discharge terminal are never to be
positioned on opposite walls.
Model 23
Max equivalent length of discharge pipe Ø 120 mm: 7 meters
Each added wide radius 90° equals 1 meter discharge
Each added narrow radius 90° equals 1.5 meter discharge
Model 33
Max equivalent length of discharge pipe Ø 120 mm: 9 meters
Each added wide radius 90° equals 1 meter discharge
Each added narrow radius 90° equals 1.5 meter discharge
Model 43
Max equivalent length of discharge pipe Ø 120 mm: 5 meters
Each added wide radius 90° equals 1 meter discharge
Each added narrow radius 90° equals 1.5 meter discharge
Model TFD 23
Air intake equivalent length
of Ø 80 mm pipe
Flue gas discharge equivalent length
of Ø 120 mm pipe
From 0 to 4 meters
Up to 7 meters
From 4 to 6 meters
Up to 9 meters
From 6 to 8 meters
Up to 11 meters
Each added wide radius 90° equals 1 meter both in air intake and flue gas discharge
Each added narrow radius 90° equals 1.5 meter both in air intake and flue gas discharge
Model TFD 33
Air intake equivalent length
of Ø 80 mm pipe
Flue gas discharge equivalent length
of Ø 120 mm pipe
From 0 to 6 meters
Up to 9 meters
From 6 to 7 meters
Up to 11 meters
Each added wide radius 90° equals 1 meter both in air intake and flue gas discharge
Each added narrow radius 90° equals 1.5 meter both in air intake and flue gas discharge
Model TFD 43
Air intake equivalent length
of Ø 80 mm pipe
Flue gas discharge equivalent length
of Ø 120 mm pipe
From 0 to 5 meters
Up to 5 meters
From 5 to 6 meters
Up to 8 meters
From 6 to 7 meters
Up to 10 meters
Each added wide radius 90° equals 1 meter both in air intake and flue gas discharge
Each added narrow radius 90° equals 1.5 meter both in air intake and flue gas discharge
