Flue Gas Routed Through A Flue Inside A Shaft With Ga Set And Secondary Ventilation For The Logamax Plus Gb162 Up To 45 Kw - Buderus Logamax plus GB162 Technical Manual

9 Flue systems for open flue operation
9.2 Flue gas routed through a flue inside a shaft with GA set and secondary ventilation
for the Logamax plus GB162 up to 45 kW
Appliance type B (formerly B
23P
Observe the general information on page 108 ff.
Logamax plus Maximum
permissible
total length L
GB162-15
GB162-25
GB162-25 T40S
GB162-35
GB162-45
Table 45 Maximum permissible total flue length
( fig. 102)
1) These lengths include the pipe diversions included in the
standard set; horizontal length L = 2 m
2) Up to three reductions for additional bends or inspection bends
can be taken into consideration; more than three must be
checked on an individual basis
Adequate combustion air supply
According to the Technical Rules for Gas Installations
DVGW-TRGI 2008 [Germany], the adequate supply of
combustion air in the installation room requires vents
towards the outside with a free cross-section of
2
1 × 150 cm or 2 × 75 cm
Maintain the minimum dimensions of the shaft
cross-section to ensure that the free cross-section is
adequate for the secondary ventilation of the flue
( fig. 101).
Inspection apertures
Allow for inspection apertures in accordance with
regulations ( page 114 f.).
Shaft terminal in conjunction with combustion
equipment for solid fuel
If the shaft cover of the GA set and the chimney terminal
of combustion equipment for solid fuel are side by side,
then the shaft cover must be made from non-combustible
material. In such applications use the standard GA set
with stainless steel shaft cover and terminal pipe
( fig. 102).
If there is a risk of soot fire in the adjacent chimney, the
plastic flue must be at least 50 mm away from the wall of
the adjacent chimney (according to the state combustion
order [Germany]). Where this cannot be ensured, design
the flue using non-combustible materials (e.g. stainless
steel fig. 101) and route it inside the shaft used for the
condensing boiler.
116
)
23
Reduction of the total
length for each
1)
additional pipe
2)
diversion
[m] [m]
50 L – 1.5
50 L – 1.5
50 L – 1.5
39 L – 1.5
31 L – 1.5
2
.
B
A
Fig. 101 Minimum dimensions of the shaft cross-section
and the shaft terminal for the flue (dim. in mm)
A Chimney F 90
B Flue gas from the combustion equipment for solid fuel
C Stainless steel shaft cover
D Minimum wall thickness for chimney F90 (L90)
1) Required shaft cross-section with ≤ 1.5 mm surface finish
GA set
≥ 400
12
A
∅ 80
1)
C
1)
Fig. 102 Installation version (dim. in mm)
A Flue gas
B Secondary ventilation
C Ventilation air
1)
Vent to the outside 1 × 150 cm
6 720 645 821 (2010/09) – Logamax plus GB162
C
≥ 50
120 × 120
∅ 120 1)
D
∅ 140
6 720 642 463-84.1il
A
9 +10
B B
≥ 1000
(14)
11
8/15
A
B
∅ 80
3 4 11
7
2
5
1
+
6
L
1
6 720 641 280-49.1il
2 2
or 2 × 75 cm
L