Checking the balanced flue system soundness (annular gap
check)
A
Combustion air port (ventilation
air)
For balanced flue systems tested
together with the wall mounted gas
fired boiler, some authorities waive
the requirement for a soundness test
(overpressure test) during commis-
sioning by the flue gas inspector.
We recommend that your heating
engineer carries out a simple sound-
ness test during the commissioning of
your system. For this, it would be suf-
ficient to check the CO
2
or O
2
concen-
tration in the combustion air at the
annular gap of the balanced flue pipe.
The flue pipe is deemed to be sound if
the CO
2
concentration in the combus-
tion air is no higher than 0.2 % or the
O
2
concentration is at least 20.6 %.
If actual CO
2
values are higher or O
2
values are lower, then pressure test
the flue pipe with a static pressure of
200 Pa.
Further details regarding the individual steps
(cont.)
17
Commissioning, inspection, maintenance
5692
731
GB
Содержание VITODENS 333-F WS3A
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