Wolf COB - Page 54

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General notes
Particularly for safety reasons, use only original Wolf
components for flues and concentric balanced flue
systems.
Where necessary, adapt the installation examples to the
relevant Building Regulations and requirements of your
country/region. Discuss any questions relating to the
installation of inspection covers and ventilation apertures with
your local ue gas inspector.
The electronic ue gas temperature limiter switches the oil
condensing boiler off when the ue gas temperature exceeds
120 °C.
The boiler restarts when the reset button is pressed.
Flue gas temperature limiter
The clear cross-section of ues must be able to be inspected.
Therefore, install an inspection and/or test aperture inside the
boiler room; agree suitable arrangements with your local ue
gas inspector.
31. Design information
At low outside temperatures, the water vapour
contained in the ue gas may condense and freeze
on the balanced ue. This ice may fall from the roof
causing injuries or material losses. Prevent ice from
falling through on-site measures, e.g. the installation
of a snow catcher grille.
Secure the balanced ue or ue outside ducts
with spacer brackets with a minimum clearance of
50 cm from the ue outlet or upstream/downstream
of diverters to prevent the pipe joints being pulled
apart. If this is not observed, there is a danger of
poisoning caused by escaping ue gas. Furthermore,
equipment damage may result.
A clearance between the concentric balanced ue and
combustible materials or components is not required, as
temperatures are limited to 85 °C at the rated boiler output.
If only a ue is installed, maintain the clearances specied
by DVGW/TRGI 86/96 [or local regulations].
Balanced ues without ducts must not be routed
through other installation rooms, as there is a risk
of re spreading, and mechanical protection is
not ensured.
The combustion air must not be drawn from chimneys
that used to carry ue gases from oil or solid fuel
boilers.
NB
If the balanced ue crosses different oors, route
the pipes outside the installation room inside a duct
with a re resistance of at least 90 min, and in low
residential buildings with a resistance of at least
30 min. Fire may spread if these instructions are not
observed.
The following applies to boilers with a balanced ue above
the roof, where only the roof structure lies above the ceiling:
If re resistance is required for the ceiling, the pipes
for combustion air supply and ue gas exhaustion
running between the top edge of the ceiling and the
roof skin must be run inside a liner that provides
the same re resistance and is constructed from
non-combustible materials. There is a risk of re
spreading if these requirements are ignored.
If re resistance is not required, route the pipes
for combustion air supply and ue gas exhaustion
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). There is a risk of re
spreading if these requirements are ignored.
Condensing boilers with a balanced ue 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.
Connectiontothebalancedue
Ducts which were previously connected to an oil
or solid fuel boiler must be thoroughly cleaned
by the ue gas inspector. 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.
NB
Flue cascade
Flue cascades are only suitable in balanced ue operation.
They must be designed to EN 13984-1.
To prevent ue gas escaping, a ue cascade is only
permitted with a tested ue gas damper.