Definitions as per DIBt
One appliance with flue gas fan for connection to an air/flue system. The combustion
air line from the air shaft and the connecting piece to the chimney are part of the
appliance.
One appliance with flue gas fan for connection to a chimney. The combustion air line
from the air shaft and the connecting piece to the chimney are part of the appliance.
When dimensioning pipe bends in the supply air line you should note that:
The ratio of the radius of curvature (r) to pipe diameter (d) should be greater than 1
r:d ≥ 1
For example:
- Diameter of supply air connection = 60 mm
- Minimum radius of pipe bends = 60 mm
Install the supply air line in as straight a line as possible and over the shortest path.
Keep the number of pipe bends to a minimum.
In addition, the following applies: The maximum resistance of the supply air line is 20
Pa!
You can find the necessary dimensions of the supply air connections in the boiler in
the technical data sheets.
3.4 Requirements for central heating water
Unless contrary to other national regulations, the latest versions of the following
standards and guidelines apply:
Austria:
Germany:
ÖNORM H 5195
VDI 2035
Switzerland
:
Italy:
SWKI BT 102-01
UNI 8065
Observe the standards and also follow the recommendations below:
❒ Aim for a pH value of between 8.2 and 10.0. If the central heating water comes
into contact with aluminium, the pH value must be between 8.0 and 8.5
❒ Use prepared water which complies with the standards cited above for filling and
make-up water
❒ Avoid leaks and use a closed heating system to maintain water quality during
operation
❒ When filling with make-up water, always bleed the filling hose before connecting,
in order to prevent air from entering the system
Advantages of prepared water:
▪ Complies with the applicable standards
▪ Less of a drop in output due to reduced limescale build-up
▪ Less corrosion due to fewer aggressive substances
▪ Long-term cost savings thanks to improved energy efficiency
Type FC
42x
Type FC
52x
3
Notes for operating a heating system
Requirements for central heating water
18
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