Tightness Test On Balanced Flue System (Annular Gap Check) - Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual

Tightness test on balanced flue system (annular gap check)

Fig. 59
Combustion air aperture (ventilation air)
A
Note
Only the gas condensing module may be operational
during the annular gap test procedure.
■ Disable power generation by the fuel cell module
before starting the test.
Turn off the ON/OFF switch on the fuel cell module.
■
See chapter "Switching OFF the micro CHP unit" in
the operating instructions.
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.
A
concentration in the combus-
2
Commissioning, inspection, maintenance
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
69