Checking The Balanced Flue System For Tightness (Annular Gap Check) - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Further details regarding the individual steps
4. "Change?" Select "Yes".
A value flashes on the display (e.g.
"85"). In the delivered condition, this
value represents 100 % of rated out-
put.
5. Select required value.
Constant temperature control unit:
1. Press OK and å simultaneously
for approx. 4 s.
Checking the balanced flue system for tightness (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.
Commissioning, inspection, maintenance
(cont.)
2. Select Ú "3" and confirm with OK.
A value flashes on the display (e.g.
"85") and "A" appears. In the deliv-
ered condition, this value represents
100 % of rated output.
3. Select required value and confirm
with OK.
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 concentration in the
2 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.
val-
2
33