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Installation
Flue gas connection, chimney and
3.5
condensate pipeline
A pressure expansion tank adapted to heating
system, water volume and static height.
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 directives 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
limiting 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
temperature and flow pressure available at the flue
gas connector are to be calculated according to the
table on chapter 2.1 (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
responsible local chimney sweeping supervisor prior
to the planning and execution of the flue gas extrac-
tion with heat output gas boilers.
Waste gas pipelines in compliance
3.5.1
with building construction law
The flue gases from the Hoval TopGas
®
(30,35,45,
50,60) can be removed via a gas-tight, temperature
and corrosion resistant flue gas pipeline.
Only flue gas systems approved and tested by the
relevant region or province are to be connected to the
Hoval TopGas
®
(30,35,45,50,60) (the admissions of
individual federal states should be complied with in
Austria). The suppliers of the flue gas pipelines sup-
ply suitable boiler connectors for the transition from
the boiler to the flue gas pipeline. The flue gas con-
nector on the Hoval TopGas
®
(30,35,45,50,60) has a
concentric flue gas connection ø 80/125 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
manufacturer 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 supervi-
sor is recommended.
Your Hoval agent can supply a suitable and approved
flue gas system for your TopGas
®
.
Please take note of the technical information sup-
plied with your flue gas pipeline.
Project planning guidelines for exhaust
3.5.2
gas systems
All applicable regional, national and state regula-
•
tions are to be observed with respect to the flue
gas extraction system.
All air inlet/flue gas pipelines must have a meas-
•
uring 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 shortened. Length adjustment pieces or cut to
length pieces are to be used for adjusting to the
required lengths.
