Buderus Logamax plus GB162 Technical Manual page 136

10 Flue systems for balanced flue operation
Routing solar lines through existing shafts for flues
Deviating from para. 7 sect. 5 MFeuVO [Germany],
retrospective routing of solar lines in existing flue shafts
can be acceptable under the following conditions:
• The retrospective routing of solar lines in existing flue
shafts is limited to building categories 1 and 2
(para. 2 sect. 3 sentence 1 no. 1 and 2 MBO) and to
solar lines that transport water only.
• The heat transfer of solar lines and fittings should be
limited by means of thermal insulation in accordance
with the Energy Savings Order dated 16 November
2001, appendix 5, table 1 [Germany]. Alternatively,
from a building regulations point of view, the minimum
thickness of thermal insulation can also be halved. The
insulating layers must be resistant to the maximum
applicable temperatures inside the solar lines as well
as to the temperature stresses resulting from the flue
system.
• Safeguard the reliable operation of the combustion
system through a calculation in accordance with DIN
EN 13384-1: 2003 03.
• The inside wall of the shaft must be smooth and free
from protrusions; all-round adequate secondary
ventilation (annular gap) of the flue must still be
ensured after the installation of the solar lines. Ensure
the stability of the flue system as well as the permanent
security of the solar lines and the sensor lead.
Permanently prevent any contact between the flue and
the thermally insulated solar lines.
• The clearance between the solar line (including thermal
insulation) and flue line must be:
– at least 2 cm for flues with circular cross-sections
inside a rectangular shaft
– at least 3 cm for flues with circular cross-sections
inside a circular shaft and
– at least 3 cm for flues with rectangular
cross-sections inside a rectangular shaft.
• Using appropriate material, seal the remaining
cross-sections in the shaft wall apertures through
which the solar lines are routed.
• The solar lines including their thermal insulation must
correspond to the requirements of the flue where their
temperature resistance is concerned.
136 6 720 645 821 (2010/09) – Logamax plus GB162