10.1.4 Air/Flue Gas Line - Buderus Logamax plus GB162 Technical Manual

Installation room for rated output ≤ 100 kW
No particular installation room is required for operating
the Logamax plus GB162 gas condensing boilers with
rated output of up to 100 kW in balanced flue mode.
Additional measures for supplying combustion air are not
required. Furthermore, no requirements regarding the size
of the installation room are required since the flue systems
of these gas condensing boilers comply with the
designation "X" = higher tightness.
For balanced flue operation up to 100 kW, the Logamax
plus gas condensing boilers can also be installed in
rooms occupied by people.
Installation room for rated output > 100 kW
In accordance with DVGW-TRGI 2008, gas combustion
equipment with a total rated output in excess of 100 kW
requires a specific installation room. Observe relevant
national or regional combustion ordinances.
For balanced flue operation, the installation room must
meet the following requirements:
• The installation room must not be used for other
purposes, except the following:
– For routing services into the building, including their
shut-off, control and measuring facilities
– For the installation of combustion equipment for
liquid fuels, heat pumps, CHP modules or
permanently fixed internal combustion engines
– For the storage of fuels
• The installation room must not have any opening to
other rooms except doorways.
• The doors to the installation room must be tight and
self-closing.
• The installation room must be able to be vented.
Install an emergency stop switch outside the installation
room in accordance with DVGW-TRGI 2008, section
8.1.4.2 [or local regulations]. The burners of the gas
condensing boilers must be able to be switched off at any
time by means of an emergency stop switch.

10.1.4 Air/flue gas line

Buderus sets
In balanced flue operation, the fan draws in the required
combustion air from the outside into the gas condensing
boiler. The air/flue gas line of the Buderus sets is a
concentric pipe or a pipe-in-pipe system made of
plastic/steel.
The outer concentric pipe supplies the combustion air.
With components for internal rooms, it is made from
zinc-plated steel, painted white. For components used
externally, it is made from zinc-plated steel painted white,
black or red or made from stainless steel. The inner pipe
is a plastic flue pipe. The roof outlet of the DO set is
completely made from plastic and is black or terracotta in
colour on the outside.
6 720 645 821 (2010/09) – Logamax plus GB162
Flue systems for balanced flue operation
The concentric air/flue gas line is installed as a complete
pipework system or as connection piece between the gas
condensing boiler and a concentric air/flue gas system.
The flue systems are categorised in accordance with
DIN-EN 14471. The flue systems certified by Buderus
correspond to the following classification (
• System-certified flue systems 1
Internally PP, externally steel, e.g. GA-K, GAF-K, DO
– EN 14471 T120 H1 o W 2 O00 E D L0
• System-certified flue systems 2
Internally PP, externally PP, e.g. DO-S
– EN 14471 T120 H1 o W 2 O00 I D L1
• System-certified flue systems 3
Single wall PP, e.g. GA, GN
– Combined with the Logamax plus GB162,
with flue gas temperatures < 85 °C,
EN 14471 T120 H1 o W 2 O00 I D L applies
– If the approval of the flue system with flue gas
temperatures of 120 °C is utilised, EN 14471 T120
H1 o W 2 O20 I D L applies
EN 14471 T120 H1 o
1 2 3
Fig. 118 Identification using system-certified flue system
1 as an example
1 Standard number
2 Temperature category
3 Pressure category
4 Soot fire resistance
5 Condensate resistance
6 Corrosion resistance
7 Clearance from combustible materials
8 Installation location
9 Fire resistance
10 Casing
fig. 118):
W 2 O00 E D L0
4 5 6 7 8 9 10
6 720 641 280-44.1il
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