Checking The Balanced Flue System Tightness (Annular Gap Check) - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Adjusting the pump rate of the integral...
Curve Pump rate, circulation pump
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Checking the balanced flue system tightness (annular gap check)

Fig. 32
Combustion air aperture (ventilation air)
A
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 or O
2 2
tion air at the annular gap of the balanced flue pipe.
If the CO 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.
40
10 %
20 %
30 %
40 %
50 %
60 %
70 %
80 %
90 %
100 %
A
concentration in the combus-
2
(cont.)
If actual CO values are greater or O
2
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.
values are lower,
2