11
As a rule, the units must be
connected to a suitable and type-
approved exhaust gas system.
Exhaust systems are structural
installations in or on buildings
that are exclusively intended to
safely discharge exhaust gases
from combustion appliances via
the roof.
For the planning and construction
of flue gas systems, the following
are of particular importance:
■
The respective combustion
systems ordinance [FeuVo]
■
The respective state building
code [LBO]
■
DIN 18160 Part 1, Planning and
execution
■
DIN EN 13384 Part 1, Thermal
and fluidic calculation methods
■
Technical rules for gas
installation DVGW-TRGI 2008
With the planning and installation
of exhaust gas systems, the
following points must be
observed:
■
The installation and assembly
of the flue gas system must be
carried out professionally and in
accordance with the applicable
regulations
■
The dimensions of the flue pipe
must be designed in accordance
with the unit power rating and
the structural conditions or
requirements
Annual inspection and
maintenance
In accordance with the operating
conditions, the units must, if
necessary, be checked at least
yearly by a specialist to ensure that
they are in a condition that is safe
to use.
For reasons of operational
readiness, functional safety,
economic efficiency and
compliance with the emission
limits, the operator must have the
units inspected at least once a year
by a representative of the installer
company or another expert.
For the measurement of the
combustion values, the legal
provisions of the BImSchV. shall be
applied.
If defects are found, the operator
must be informed that they must
have components repaired or
replaced immediately.
The following applies to this:
Repair work on the limiting
devices, the self-regulating devices
and the flame monitoring devices
as well as on other safety devices
may only be carried out on the
individual device by the respective
manufacturer or their authorised
representative.
Exhaust gas ducting
■
Exhaust systems must be
dimensioned in terms of clear
cross-section and height in such
a way that the exhaust gases
are discharged into the open
air in all intended operating
conditions and no dangerous
positive pressure can occur with
respect to rooms
■
The mouths of exhaust systems
must project at least 40 cm
above the ridge or be at least
1 m away from the roof surface
■
If dynamic pressures are
to be expected, e.g. due
to downdrafts or from
neighbouring buildings,
the chimney head must be
designed accordingly
■
In the case of roof or wall
ducts, the flue gas system
must be routed through a pipe
sleeve or a shaft to allow free
expansion of the flue gas pipe
when it heats up
■
The unit connection must
be tight and secured against
unintentional loosening by
means of a rivet or screw
■
Horizontal flue gas sections
should preferably be kept as
short as possible
■
A resealable measuring
opening at a distance of 2 x
flue pipe D(Ø) behind the unit
connection must be provided
NOTE
The construction of the flue
gas system is in any case
subject to approval.
CAUTION
There must be no counter pressure arising
from incorrect installation of the exhaust
gas ducting under any circumstances.
NOTE
We recommend concluding a
maintenance contract with an
authorised specialist company
for regular maintenance and
cleaning work.
