10.1.5 Inspection Apertures - Buderus Logamax plus GB162 Technical Manual

10.1.5 Inspection apertures

According to DIN 18160-1 and DIN 18160-5, flue
systems for balanced flue operation must be able to be
inspected and cleaned easily and safely. For this, allow for
inspection apertures (
When arranging the inspection apertures, comply with the
requirements of DIN 18160-5 as well as all locally
applicable building regulations. For this we recommend
contacting your local flue gas inspector [where
appropriate].
Inspection apertures for DO and LAS-K sets
Where installation space is available, provide an
inspection aperture. Where installation space is
inadequate, the inspection aperture can be omitted on
flues with a length of less than 4 m subject to consultation
with the flue gas inspector. In such cases, the test ports
on the boiler flue connection are adequate. The suitability
of the flue for its purpose can be verified by taking test
measurements. Using the test ports at the boiler flue
connection, an endoscope can be used for a visual check.
If there are no inspection apertures, the flue would need
to be dismantled for necessary cleaning involving a lot
more effort.
Position of the lower inspection aperture
• When connecting a Logamax plus GB162 gas
condensing boiler to a flue, allow for a lower inspection
aperture:
– In the vertical section of the flue, immediately above
the flue diversion.
– At the face of the straight horizontal section of the
flue, no further than 1 m from the diversion into the
vertical section, subject to there being no diversion
in between ( fig. 120), or
– In the side of the horizontal section of the flue, no
further than 30 cm from the diversion into the
vertical section (
• When connecting the gas condensing boilers to a
moisture-resistant flue system (LAS multiple
connection), provide a lower inspection aperture below
the lowest connection at the base of the vertical
section of the moisture-resistant flue (LAS).
• Provide a floor area of at least 1 m × 1 m to
DIN 18160-5 in front of the lower inspection aperture.
6 720 645 821 (2010/09) – Logamax plus GB162
fig. 120 and fig. 100).
fig. 100).
Flue systems for balanced flue operation
Position of the upper inspection aperture
• An upper inspection aperture is not required in flues, if:
– The lower inspection aperture is located no further
than 15 m from the terminal.
– The vertical flue section is routed at an angle of no
more than 30° (corbelled).
– The lower inspection aperture is implemented in
accordance with DIN 18160-1 and DIN 18160-5
( fig. 120 and fig. 100).
• Upstream and downstream of every diversion in excess
of 30°, an additional inspection bend is required.
• Provide a floor area of at least 0.5 m × 0.5 m to
DIN 18160-5 in front of the upper inspection aperture.
P
Fig. 120 Example with the inspection aperture (P)
located in a flue without diversions in the
installation room (dim. in m)
P
Fig. 121 Example with the inspection apertures (P)
located in a flue with diversions in the
installation room - top view (dim. in m)
< 15
≤ 1
6 720 641 280-58.1il
> 1
≤ 0,3
6 720 641 280-59.1il
10
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