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In order to ensure that the appliance functions correctly and efficiently, the flue connection between the boiler and the
flue terminal must be made using original components specifically designed for condensing boilers.
Traditional flue components cannot be used for conveying exhaust fumes from condensing boilers, nor vice versa.
It is recommended that:
-
for the exhaust discharge duct, the entire length of the flue slopes upwards towards the exterior in order to facilitate the flow of
condensate back to the combustion chamber, which has been specifically designed to collect and drain the acidic condensate;
-
for the air intake, the entire length of the duct slopes upwards towards the boiler to prevent the entry of rainwater, dust or foreign
bodies into the pipe;
in the case where a horizontal coaxial system is installed, the coaxial terminal must be positioned horizontally in that the exhaust duct
has been specifically designed with the required slope (Ø 60) and the air intake (Ø 100) has been suitably protected against the weather.
4.5.3. Ø 100/60 mm air/flue gas coaxial duct system
Type C12
The minimum permissible length of horizontal coaxial pipes is 0.5 metre, not including the first elbow connected to the boiler.
The maximum permissible length of horizontal coaxial pipes is 5 metres for HC-HR 24 and 4 metres for HC-HR 32, not including the first
elbow connected to the boiler. For each additional elbow, the maximum permissible length must be reduced by 1 metre.
In addition, the pipe must have a 1% slope to prevent rainwater entering it.
Choosing the applicable diaphragm supplied with the boiler (pic. 17)
HR 24 and HC 24
HC 32 and HC 32
Pipe length (m)
Air intake diaphragm
(mm)
0,5≤ L ≤ 2
80
2 ≤ L ≤ 5
82
* excluding the first elbow connected to the boiler
Type C32
The minimum permissible length of vertical coaxial pipes is 0,5 metre, equal to the length of the chimney.
The maximum permissible length of vertical coaxial pipes is 5 metres for HC-HR 24 and 4 metres for HC-HR 32, including the terminal.
For each additional elbow, the maximum permissible length must be reduced by 1 metre.
Choosing the applicable diaphragm supplied with the boiler (pic. 17)
NEOPRENE
GASKET
SEALING
CAP
NEOPRENE
GASKET
FROM 0,5 M TO 5 M
pic.17
0CONDASP01
AIR INTAKE DIAPHRAGM
Supplied with the boiler
Pipe length (m)
Air intake diaphragm
(mm)
0,5≤ L ≤ 2
87
2 ≤ L ≤ 4
-
* excluding the first elbow connected to the boiler