P2_GEPARD_installer manual_ work basis_EN_02 - 03/10 - protherm
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INSTALATION
Piping gradient7.2.8
The layout of the piping must permit a down-gradient of the
exhaust piping towards the boiler at a nominal gradient of 3
percent. A device for drawing off condensate must be placed on
the piping as close as possible to the boiler.
Safety measures7.2.9
The distance of fl ammable materials from the exhaust
component of the separate piping must be enough to ensure
that the temperature at the surface of these materials is no
higher than 80°C.
Exhaust may not be vented in areas:
where a danger of explosion is present (as set forth in STN •
33 2320)
that are interior areas of a building (lofts, halls, stairwells •
etc.)
closeable, i.e. passages or gateways etc.•
that descend underground (even if these remain open to •
the surroundings and free of obstructions), e.g. tunnels,
underpasses etc.
These basic injunctions for venting exhaust must always take
adequate account of where independent air intakes are sited.
Wall apertures for coaxial piping for drawing in air and venting
exhaust are cut to the appropriate size (approx. 120 to 150
mm) and sealed (with building construction methods) following
the installation. Non-fl ammable materials (with Degree A
of fl ammability according to STN 73 0823) must be used
for sealing, e.g., masonry mortar, plaster etc. Openings in
combustible walls or roofs must be made according to the fi rst
section of this part.
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