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

Tightness test on balanced flue system (annular gap test)

A
Fig. 28
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.

Removing the burner

4x
G
C
E
D
B
Fig. 29
1. Turn off the ON/OFF switch on the control unit and
the power supply.
concentration in the combus-
F
A
Commissioning, inspection, maintenance
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.
After the tightness test, re-seal the test port with the
plug.
2. Close the gas shut-off valve and safeguard against
reopening.
2
values are
2
39