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4 213 894 / 01
ASSEMBLY
4.4
Flue gas connection, chimney and
condensate pipeline
NOTE
The condensate from the exhaust gas sys-
tem must not be discharged through the boi-
ler. The condensate must be discharged from
the exhaust pipe before the boiler through a
siphon.
Due to water vapour content of the flue gases with low
temperature and the resulting further condensation in the
flue, heat output boilers cannot be connected to standard
house flues.
The applicable local authority regulations and the special
regulations in the DVGW-(TRGI), ÖVGW and SVGW di-
rectives are to be complied with for flue gas removal.
In accordance with the VKF-guidelines (edition 1993,
number 3.4.8) for Switzerland a flue gas temperature li-
miting device according to the above mentioned directive
must be installed in the flue gas pipeline.
There are two possibilities of flue gas removal with heat
output gas boilers:
a)
The use of specially approved flue gas pipelines,
b)
Use of damp-insensitive flues, approved for flue
gas temperatures starting from 40°C, connected
to the heat output boiler in the boiler installation
room via approved flue gas pipelines.
In both cases the cross sections and maximum lengths
based on the values for flue gas flow rate, flue gas tem-
perature and flow pressure available at the flue gas con-
nector are to be calculated according to the table on page
6 (DIN 4705).
The calculation is normally made by means of graphs
or tables provided by the manufacturer of the moisture-
resistant flue of the special flue gas pipeline. Often this
manufacturer performs the calculation using a computer
program specially created for the model in question.
In any case, we recommend a discussion with the res-
ponsible local chimney sweeping supervisor prior to the
planning and execution of the flue gas extraction with
heat output gas boilers.
4.4.1 Waste gas pipelines in compliance with buil-
ding construction law
The flue gases from the Hoval TopGas
®
(80) can be re-
moved via a gas-tight, temperature and corrosion resis-
tant flue gas pipeline. Only flue gas systems approved
and tested by the relevant region or province are to be
connected to the Hoval TopGas
®
(80) (the admissions of
individual federal states should be complied with in Aus-
tria). The suppliers of the flue gas pipelines supply sui-
table boiler connectors for the transition from the boiler
to the flue gas pipeline. The flue gas connector on the
Hoval TopGas
®
(80) has a concentric flue gas connection
ø 100/150 mm.
We recommend installation of the connector
piece (boiler flue gas connector vertical flue
gas pipeline) in the same diameter as the flue
gas connector on the TopGas
®
.
The planning and installation instructions of the manufac-
turer together with the building construction regulations
are to be observed in the planning and execution of the
flue gas pipeline. A timely discussion with the responsible
local chimney sweeping supervisor is recommended.
Your Hoval agent can supply a suitable and approved flue
gas system for your TopGas
®
.
Please take note of the technical information supplied
with your flue gas pipeline.
4.4.2 Project planning information for the TopGas
®
•
All applicable regional, national and state regulations
are to be observed with respect to the flue gas extrac-
tion system.
•
All air inlet/flue gas pipelines must have a measuring
orifice (already incorporated in the moduel kits). These
are to be positioned where they can be easily accessed
for measuring purposes.
•
The concentric length elements cannot simply be shor-
tened. Length adjustment pieces or cut to length pieces
are to be used for adjusting to the required lengths.
•
Single flue gas pipes can be shortened to the necessa-
ry length but must however be cleanly deburred befo-
re the assembly, to prevent damage to the seal in the
counter-piece.
•
When installing the pipes in a shaft, spacer elements
must be mounted every 2 m. For the vertical supporting
of the chimney pipeline, the very bottom element must
be permanently fixed (mounting rail or pipe clip).
•
Horizontal connections must have a gradient of at least
5 cm per running metre in the direction of the boiler, to
permit unobstructed flow of the condensate to the boi-
ler. The complete flue gas system must be installed to
prevent the accumulation of condensate.
Summary of Contents for TopGas 80
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