Tightness Test On Balanced Flue System (Annular Gap Check) - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance

Tightness test on balanced flue system (annular gap check)

A
Fig. 28
Combustion air aperture (ventilation air)
A
For balanced flue systems tested together with the
heat source, there is no requirement for a tightness
test (overpressure test) during commissioning by the
flue gas inspector.
In this case, we recommend that your heating contrac-
tor carries out a simple tightness test during the com-
missioning of your system. For this it would be suffi-
cient to check the CO or O
2
bustion air at the annular gap of the balanced flue
pipe.
40
concentration in the com-
2
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.
If actual CO values are higher or actual O
2
lower, a pressure test with a static pressure of 200 Pa
will need to be carried out on the flue pipe.
2
values are
2