Wolf FGB-35 - Page 79

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With low outside temperatures, the water vapour
contained in the ue gas may condense on the
balanced ue and freeze. This ice may fall from
the roof, causing personal injuries or material
losses. Prevent ice from falling by taking on-site
measures, e.g. installing a snow guard.
If re resistance is not required for the ceiling, route
the lines for the combustion air supply and the ue
gas from the top edge of the ceiling to the roof
skin in a shaft made from non-combustible, rigid
materials or in a protective metal pipe (mechanical
protection). There is a risk of re spreading if these
requirements are not observed.
General information
For reasons of operational safety, use only original Wolf
componentsforconcentricbalanceduesandstandard
ues.
Where necessary, adapt the installation examples to the
relevant building regulations and requirements in your
country/region. Any questions relating to the installation,
particularly regarding the inspection components and
ventilation apertures should be raised with your local ue gas
inspector prior to installation.
Gas condensing boilers with a balanced ue
with roof outlet 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.
If the balanced ue crosses different oors, route
the pipes outside the boiler room inside a shaft
with at least 90 min re resistance. In low-rise
residential buildings (building category 1 to 2) a
minimum of 30 min re resistance is required. Fire
may spread if these instructions are not observed.
The following applies to gas boilers with a balanced ue
routed 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 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 re resistance as the
ceiling and must be made from non-combustible
materials. There is a risk of re spreading if these
requirements are not observed.
Outside the shaft, secure the balanced ue or
standard ue with spacer brackets. 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, equipment
damage may result.
No clearance is required between the concentric balanced
ue and combustible materials or components, as no
temperatures higher than 85 °C will occur at the rated output.
If only a standard ue is installed, maintain the clearances
specied by DVGW/TRGI 2008 [or local regulations].
Balanceduesystemswithoutshaft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 previously used to carry ue gases from
oil or solid fuel boilers.
Please note
31.Technicalinformation,balancedue
If the gas condensing boiler is installed with a balanced ue
routed over an external wall (type C13x), the rated boiler
output in heating mode must be reduced to below 11 kW (for
appropriate measures, see chapter "Matching the maximum
output").