Technical Information - Wolf COB Technical Manual And Installation Instructions

General information
For reasons of operational safety, use only original Wolf
components for balanced flues and standard flues.
Where necessary, adapt the installation examples to the relevant
building regulations and requirements in your country/region.
Discuss any questions relating to the installation of inspection
covers and vents with the local flue gas inspector.
At low outside temperatures, the water vapour
contained in the flue gas may condense and
freeze on the air/flue gas routing system. This ice
may fall from the roof causing injuries or material
losses. Prevent falling ice with suitable measures,
e.g. installation of a suitable snow guard.
If the balanced flue crosses different floors, route
the pipes outside the installation room inside a
duct with a fire resistance of at least 90 min. If this
instruction is not followed, and if there is exposure
to fire from outside, there is a risk that the fire and
smoke are transmitted to other floors. This again
results in a risk of asphyxiation, or severe to life-
threatening burns and poisoning.
Condensing boilers with a balanced flue outlet above the roof
may only be installed in attics, or in rooms where the ceiling also
forms the roof, or where only the roof construction is located
above the ceiling.
The following applies to boilers with a balanced flue 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. If the precautions mentioned here are
not taken, and if there is exposure to fire from
outside, there is a risk that the fire and smoke are
transmitted to other floors. This again results in a
risk of asphyxiation, or severe to life-threatening
burns and poisoning.
If fire resistance is not required for the ceiling,
route the ducts for combustion air supply and
flue gas expulsion between the top edge of the
ceiling and the roof skin inside a duct made
from non-combustible, rigid materials or inside a
protective metal pipe (mechanical protection). If
the precautions mentioned here are not taken, and
if there is exposure to fire from outside, there is a
risk that the fire and smoke are transmitted to other
floors. This again results in a risk of asphyxiation,
or severe to life-threatening burns and poisoning.
No clearance is required between the concentric balanced flue
and combustible materials or components, as temperatures
above 85°C will not occur at the rated heating output.
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36 Technical information
Note
Connection to the air/flue gas routing system
It must be possible to inspect the entire cross-section of the flues.
Therefore, install an appropriate cleaning and/or inspection port
inside the boiler room; agree suitable arrangements with the
local flue gas inspector.
Flue cascade
Flue cascades are only suitable in balanced flue operation. They
must be designed to EN 13984-1.
Flue gas temperature limiter
The electronic flue gas temperature limiter switches the oil
condensing boiler off when the flue gas temperature exceeds
120 °C.
Note
A balanced flue without a duct must not be routed
through other installation rooms, as mechanical
protection is not ensured. Otherwise, if there is
exposure to fire from outside, there is a risk that the
fire and smoke are transmitted to other floors. This
again results in a risk of severe to life-threatening
burns and poisoning.
Ducts which were previously connected to
an oil or solid fuel boiler must be thoroughly
cleaned by the chimney sweep. There must
be no dust, sulphur or soot residues left on
the inner surface of the chimney. If this is not
possible, use a separate ventilation supply.
If the combustion air is drawn in via the cleaned
duct, the prior use can cause odours in the boiler
room.
Outside the duct, secure the balanced flue or
standard flue with spacer clips. These must be
placed at a minimum of 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. This again results in a risk of
asphyxiation, or severe life-threatening poisoning.
Additionally, falling parts may result in injuries or
damage to the device.
A flue cascade is only permitted with a tested flue
gas damper. Operation with a leaking flue gas
damper carries a risk of asphyxiation or severe
to life threatening injuries caused by the leaking
flue gas.
The appliance will go back into operation when
the reset button is pressed. It is important to
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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