39
A
Fig. 27
A
Combustion air aperture
For balanced flue systems tested together with the
heat generator, there is no requirement for a tightness
test (overpressure test) during commissioning by the
flue gas inspector.
In this case, we recommend that a simple tightness
test is carried out during system commissioning. For
this, check the CO
2
or O
2
concentration in the combus-
tion air at the annular gap of the balanced flue pipe.
If the CO
2
concentration is less than 0.2 % or the O
2
concentration is greater than 20.6 %, the flue pipe is
deemed to be sufficiently gas-tight.
If actual CO
2
values are greater or O
2
values are lower,
then pressure test the flue pipe with a static pressure
of 200 Pa.
!
Please note
If the test port is not sealed, combustion air is
drawn in from the room.
After the tightness test, re-seal the test port with
the plug.
Burner adjustment when connecting multiple flues to a shared flue system
Note
Only make this adjustment on appliances suitable for
multiple connection.
For suitable Vitodens appliances, see pricelist.
When connecting several Vitodens 050-W to a com-
mon flue system:
For multiple connection, in the
commissioning assis-
tant
use
"C.5"
and
"C.6"
to match the burner setting
to the flue system. See page 29.
System conditions:
■
Shared flue in shaft
7
100 mm
■
Balanced flue connection pipe from boiler to shaft,
7
80/125 mm
■
Minimum shaft cross-section
–
Square: 175 x 175 mm
–
Round:
7
195 mm
■
Height between floors min. 2.5 m
■
Max. 6 boilers with the same rated heating output
connected to the flue system
Commissioning, inspection, maintenance
Checking the balanced flue system for leaks (annular gap test)
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