Tightness Test, Balanced Flue System (Annular Gap Check) - Viessmann VITODENS 242-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Tightness test, balanced flue system (annular gap check)

A Combustion air aperture (ventilation
air)
For balanced flue systems tested
together with the wall mounted gas fired
boiler, the requirement for a tightness
test during commissioning by the flue
gas inspector is not applicable.
58
(cont.)
We recommend that your heating engi-
neer carries out a simple leak/tightness
test during the commissioning of your
system. For this, it would be sufficient to
check the CO or O
2
combustion air at the annular gap of the
balanced flue pipe.
The flue pipe is deemed to be gas-tight
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
ues are lower, then pressure test the flue
pipe with a static pressure of 200 Pa.
concentration in the
2
val-
2