Example For Calculating The Flue Lengths (Fig. 9) - Bosch Condens 5000 W Information

Flue lengths
5.4

Example for calculating the flue lengths (Fig. 9)

Installation analysis
Determine the following from the given installation situation:
• Method of routing the flue: vertical, Ø 80/125 mm
• Flue compliant with AS/NZ 5601: C
• Condensing boiler: ZSB 30-2 A
• length of horizontal flue: L = 1 m
w
• length of vertical flue: L = 6 m
s
• Number of 90 ° deviations in the flue: 2
• Number of 15 °, 30 ° and 45 ° deviations in the
flue: 0
Determining the parameters
Determine the parameters from table 6 as the flue is routed through a
duct compliant with C . The following values result from ZSB 30-2 A:
33
• L = 15 m
equiv,max
• equivalent length for 90 ° deviations: 2 m
• equivalent length for 15 °, 30 °and
45 °deviations: 1 m
straight length L
S
straight length L
W
90 ° elbow
45 ° elbow
Table 8
The equivalent total pipe length with 11 m is less than the maximum
equivalent total length of 15 m. As a result, the flue is OK.
14
33
Length/Number
6 m
1 m
2
0
Calculation of the equivalent pipe length L
The equivalent pipe length L
equiv
horizontal and vertical flue lengths (L
elbows. The required 90 ° elbows are included in the maximum lengths.
Take every additional deviation with its equivalent length into
consideration.
The equivalent total pipe length must be shorter than the maximum
 L
equivalent pipe length: L
equiv
equivalent
partial length
× 1
× 1
× 2 m
× 1 m
equivalent pipe length L
Maximum equivalent pipe length L
L
equiv
Condens 5000 W – 6720644146 (2019/03)
equiv
is calculated from the sum of the
, L ) and the equivalent lengths of
w s
equiv,max
Total length
= 6 m
= 1 m
= 4 m
= 0 m
11 m
equiv
15 m
equiv,max
L
o.k.
equiv,max