Wolf COB Installation Instructions And Technical Manual page 48

Balanced flue routing
Versions as condensing boilers
B23 Flue in a duct and combustion air directly via the boiler (open flue)
B33 Flue in a duct with horizontal, concentric connection line (open flue)
B33 Connection to a moisture-resistant flue gas chimney with
a horizontal concentric connection line (open flue)
C33x Vertical concentric roof outlet through a pitched or flat roof, vertical concentric
balanced flue for installation in a duct, (balanced flue)
C43x Connection to a moisture-resistant balanced flue chimney,
maximum pipe length from centre of boiler bend to connection 2 m
(balanced flue)
C53 Connection to the flue in a duct and
ventilation air line through an external wall (balanced flue)
C53x Connection to a flue on an external wall (balanced flue)
C83x Connection to the flue in a duct and
ventilation air through an external wall (balanced flue)
C83x Concentric connection to a moisture-resistant flue gas chimney and
combustion air through an external wall (balanced flue)
C93x Vertical flue for installation in a duct,
flexible and rigid with horizontal concentric connection line
Available fan draught: COB-15: 32-65 Pa / COB-20: 45-65 Pa / COB-29: 55-105 Pa / COB-40: 70-150 Pa
1)
(the maximum length corresponds to the total length from the appliance to the flue terminal)
Vertical flue for installation in a duct, flexible and rigid with horizontal concentric connection line Calculation to DIN EN 13384
2)
(balanced flue manufacturer)
Note:
Systems C 33x and C 83x are also suitable for installation in garages.
Where necessary, adapt the installation examples to the relevant Building Regulations and requirements of your country/region.
Discuss any questions relating to the installation, particularly regarding the inspection components and ventilation apertures, prior
to installation with your local flue gas inspector.
The length dimensions refer to concentric balanced flue and flues, and only to original Wolf components.
Calculating the balanced flue length
The calculated length of the balanced flue system or the flue
is derived from the straight pipe length and the length of the
pipe bends.
Example:
Length of straight balanced flue 1.5 m
Inspection tee 87° = 2 m
2 x 45° bends = 2 x 1 m
L = 1.5 m + 1 x 2 m + 2 x 1 m
L = 5.5 m
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31. Design information
Table: Pipe length calculation
COB-15 COB-20 COB-29 COB-40
30
30
Calculation to DIN EN 13384
(balanced flue manufacturer)
20
Calculation to DIN EN 13384
(balanced flue manufacturer)
30
30
30
Calculation to DIN EN 13384
(balanced flue manufacturer)
rigid 27
flexible 19
Component
87° bend
45° bend
Tee 87° with inspection
aperture
Straight pipe
Max. length, vertical
1)
30 30 30
30 30 30
20 16 21
30 30 30
30 30 30
30 30 14
27 22 20
19 16
2)
Calculated length
1.5 m
1 m
2 m
Subject to length
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