Wolf CGB-2 Series Installation Instructions For Contractors page 73

General information
For reasons of operational safety, use only original Wolf
components for concentric balanced flues and standard
flues.
Where necessary, adapt the installation examples to the rel-
evant building regulations and requirements in your country/
region. Any questions relating to the installation, particularly
regarding the inspection components and ventilation aper-
tures, should be raised with your local flue gas inspector prior
to installation.
With low outside temperatures, the water vapour
contained in the flue gas may condense and freeze
on the flue. This ice may fall from the roof caus-
ing injuries or material losses. Prevent ice from
falling by taking on-site measures, e.g. installing a
snow guard.
If the balanced flue passes through different floors of
the building, route the pipes outside the boiler room
inside a duct with at least 90 min fire resistance.
In low-rise residential buildings (building category
1 to 2) a minimum of 30 min fire resistance is re-
quired. Fire may spread if these instructions are
not observed.
Gas condensing boilers with a balanced flue with
roof outlet may be installed only in attics or in rooms
whose ceiling also forms the roof or where only the
roof construction is located above the ceiling.
The following applies to gas boilers with a balanced flue routed
above the roof, where only the roof structure lies above the
ceiling:
If fire resistance is required for the ceiling, the
pipes for combustion air supply and flue gas must
be equipped with a casing in the area between the
top edge of the ceiling and the roof skin. The casing
must provide the same fire resistance as the ceiling
and must be made from non-combustible materials.
There is a risk of fire spreading if these requirements
are not observed.
3064810_201804
37. Technical information,
air/flue gas routing
No clearance is required between the concentric balanced
flue and combustible materials or components, as at the rated
output temperatures higher than 85 °C will not arise.
If only a standard flue is installed, maintain the clearances
specified by DVGW/TRGI 2008 [or local regulations].
Please
Flue gas temperature limiter
The electronic flue gas temperature limiter switches the oil
condensing boiler off when the flue gas temperature exceeds
110 °C.
Please
If fire resistance is not required for the ceiling,
route the lines for the combustion air supply and
the flue gas from the top edge of the ceiling to the
roof skin in a duct made from non-combustible, rigid
materials or in a protective metal pipe (mechanical
protection). There is a risk of fire spreading if these
requirements are not observed.
Air/flue systems without a duct must not be
routed through other installation rooms, as
there is a risk of fire spreading and mechanical
protection is not ensured.
Combustion air must not be drawn from chimneys
previously used to carry flue gases from oil or solid
note
fuel boilers.
Outside the duct, secure the balanced flue or stand-
ard flue with spacer clips. These must be provided
at a minimum 50 cm from the appliance connection
and upstream/downstream of diversions, to prevent
the pipe joints being pulled apart. Flue gas may
escape if these instructions are not observed.
Furthermore, damage to the appliance may result.
The appliance will go back into operation when
the reset button is pressed. It is important to
note
find out why the appliance deactivated before
resetting the boiler. Resetting the boiler when
the flue gas temperature is too high can destroy
the flue gas system.
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