52
Checking the balanced flue system for tightness (annular gap
check)
A
Combustion air test point (ventila-
tion air)
The flue pipe is deemed to be suffi-
ciently gas-tight if the CO
2
concentra-
tion in the combustion 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.
Draining the boiler
!
Please note
Risk of scalding
Only drain the boiler once the
boiler water temperature has
dropped below 40 °C.
To check the current boiler water
temperature, see page 69.
1. Turn off the ON/OFF switch on the
control unit and the power supply.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5837146
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