Viessmann Vitodens 200, Service Instructions Manual

Page: 16 / 116

16
Initial start-up, inspection and maintenance
Further details regarding the individual steps
(cont.)
Leak testing the BF system (checking the circular gap)
For balanced flue systems tested together with the gas-fired wall-mounted
boilers, some Federal States (e.g. NordrheinĆWestfalia) waive the leak test
(overpressure test) during commissioning by the district chimney sweep.
We recommend that your heating engineer carries out a simple leak test
during the initial start-up of your system. It would be sufficient to check the
CO
2
concentration in the combustion air at the annular gap in the BF line.
The flue pipe is deemed to be sufficiently tight, if the CO
2
concentration in the
combustion air is a maximum of 0.2
Ă
% and the O
2
concentration is a minimum
of 20.6
Ă
%.
If actual CO
2
values are higher or O
2
values are lower, then you must test the
flue pipe for leaks at a static overpressure of 200ĂPa.
A Combustion air test nipple
(ventilation air)
5692Ă485
G
B
A