Installation
30 Instruction manual BFC
3
is
Explanation of types of installation
Note
Make sure that the chimney flue discharges into an area approved for this
type of installation.
3.9.3 Concentric connections
The table shows the requirements for concentric systems.
Warning
Install flue gas discharge pipe runs with a run-off of 5 mm per metre towards
the water heater.
Flue gas discharge requirements for concentric systems (C13, C33)
Caution
Both conditions stated in the table must be fulfilled.
Even if you use less than the stated maximum number of bends, the maximum
pipe length still may not be exceeded.
Even if you use less than the stated maximum pipe length, the maximum
number of bends still may not be exceeded.
The following example illustrates how to use the table.
Practical example of concentric flue gas discharge
Example
The figure shows a BFC 30 installation. The water heater must be fitted with 25
m of concentric pipe (C13/C33) and four 90 degree bends. The configuration
must be checked for compliance with the requirements stated in the table.
Installation type Description
B23 Air for combustion is drawn from the boiler room.
C13 Concentric and/or parallel wall flue terminal.
C33 Concentric and / or parallel roof flue terminal
C43 Water heaters on common air supply and flue gas discharge (concentric
and/or parallel) in multi-storey building.
C53 Air supply and flue gas discharge terminal types mixed.
C63 Water heaters supplied without flue gas discharge materials and/or terminal.
These water heaters must be installed in compliance with local regulations.
Appliance Diameter Maximum
length
Maximum
number of
90
o
bends
BFC 28, 30, 50, 60 100/150 mm 40 m 7
BFC 80, 100, 120 130/200 mm 15 m 4
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