Flue gas system
Dimensioning single
13
Dimensioning
When dimensioning a flue gas system,
it’s necessary to perform a calculation
check of the flue gas system in order to
verify if the choosen system is
appli
cable.
The following table shows two
examples of possible flue gas systems,
including the maximum possible height
of the system. These examples only
give an indication of the possible
heights, but they cannot be used for
official flue gas layout calculation. Each
flue gas system must be calculated by
an authorized company.
The maximum negative flue gas
pres
sure, which doesn’t affect the
burner
modulation ratio, is 30 Pa. Higher
nega
tive pressure will lead to limitation
of
the burner modulation ratio.
The maximum horizontal flue gas way
is 20 m. With horizontal ways longer
than 20 m, a faultless burner start in
cold condition can not be guaranteed.
VERSION 1
Calculation base:
Total connection length in boiler room
≤
1.5 m;
2x 87°-bend
Maximum permissible height (h) of flue gas
system in m
Boiler type Ø 80
[mm]
Ø 100
[mm]
Ø 110
[mm]
Ø 125
[mm]
Ø 130
[mm]
R40/65
10
65
R40/85
30
51
R40/100
20
34
42
44
R40/120
32
54
68
70
R40/150
18
31
38
40
VERSION 2
Calculation base:
Total connection length in boiler room
≤
3 m;
4x 87°-bend
Maximum permissible height (h) of flue gas
system in m
Boiler type Ø 80
[mm]
Ø 100
[mm]
Ø 110
[mm]
Ø 125
[mm]
Ø 130
[mm]
R40/65
6
61
R40/85
26
47
R40/100
16
30
38
40
R40/120
28
50
64
66
R40/150
14
27
34
36
Concentric flue gas system
Calculation base: roof or wall terminal
Boiler type
2 bends 90°
4 bends 90°
R40/65
5
2
R40/85
4
1
R40/100
3
-
R40/120
4
2
Maximum permissible length of flue gas
system in m
Concentric flue gas system
The R40 boiler models 65, 85, 100 and
120 can be connected to a concentric
flue gas system.
Via a parallel-to-concentric adapter
(optional) the boiler can be connected
to:
100/150 concentric system from
Muelink&Grol;
110/150 concentric system from
Skoberne.
See table for max. permissible flue
lengths.
