A.O. Smith cyclone BFC - 80 Installation And Service Manual page 28

3
Type of appliance
B23
C13
C33
C43
C53
C63
3.9.3
28
Installation
Explanation of type of appliance
Description
Air for combustion is drawn from the boiler room.
Concentric and / or parallel wall flue terminal
Concentric and / or parallel roof flue terminal
Appliances on common air supply and flue gas discharge (concentric and / or
parallel) in multi-storey building.
Air supply and flue terminal types mixed.
Appliances supplied without flue components and / or terminal. These
appliances must be installed in compliance with local regulations.
Note
Make sure that the chimney discharges into an area where this is permitted
for this category of appliance.
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.
Flue gas discharge requirements for concentric systems (C13, C33)
Appliance Diameter
BFC 80 130/200mm
BFC 100 130/200mm
Caution
Both conditions stated in the table must be fulfilled.
Even if there are less bends than the stated maximum, the maximum pipe
length may not be exceeded.
Even if the total pipe length is less than the stated maximum, the maximum
number of bends 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 100 installation. The appliance must be fitted with 12m
of concentric pipe (C13/C33) and three 90 degree bends. We need to check
whether this configuration complies with the requirements stated in the table.
is
Maximum length Maximum
number of 90°
bends
15m 3
15m 3
Instruction manual BFC