Testing The Balanced Flue System (Annular Gap Test) For Soundness; Draining The Heating System - Viessmann VITOPEND 200 Installation And Service Instructions Manual

Further details regarding the individual steps
3. Record the setting for maximum
output on the additional type plate
supplied with the "Technical docu-
mentation". Affix the type plate next
to the type plate on top of the boi-
ler.
Testing the balanced flue system (annular gap test) for
soundness
A Combustion air test port (ventila-
tion air)

Draining the heating system

!
Please note
Risk of scalding
Only drain the heating system
when the boiler water or the
cylinder temperature has
dropped below 40 °C.
Initial start-up, inspection, maintenance
(cont.)
The flue pipe is deemed to be sound if
the CO concentration in the combus-
2
tion air is no higher than 0.2 % or the
O concentration is at least 20.6 %.
2
If actual CO values are higher or O
2
values are lower, then pressure test
the flue pipe with a static pressure of
200 Pa.
2
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