Checking the balanced flue system for soundness (annular
gap check)
A Combustion air test port (ventila-
tion air)
The flue pipe is deemed to be sound if
the CO2 concentration in the combus-
tion air is no higher than 0.2 % or the
O2 concentration is at least 20.6 %.
If actual CO2 values are higher or O2
values are lower, then pressure test
the flue pipe with a static pressure of
200 Pa.
Draining the heating system
!
Please note
Risk of scalding
Only drain the heating system
when the boiler water tempera-
ture has dropped below 40 °C.
Further details regarding the individual steps (cont.)
30
Commissioning, inspection, maintenance
5592 817 GB
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