Checking The Balanced Flue System For Tightness (Annular Gap Check) - Viessmann Vitodens 200-W Installation Instructions Manual

Further details regarding the individual steps
Weather-compensated control unit
Service menu
1. Press OK and å simultaneously for
approx. 4 s.
2. "Service functions"
3. "Max. output"
4. "Change?" Select "Yes".
A value is shown on the display (e.g.
"85"). In the delivered condition, this
value represents 100 % of rated heat-
ing output.
5. Set the required value.
Checking the balanced flue system for tightness (annular gap
check)
A
A Combustion air aperture
For balanced flue systems tested
together with the heat source, there is no
requirement for a tightness test (over-
pressure test) during commissioning by
the flue gas inspector.
Commissioning, inspection, maintenance
(cont.)
Constant temperature control unit
Service menu
1. Press OK and å simultaneously for
approx. 4 s.
2. Select "3" with Ú 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 heating output.
3. Select required value and confirm with
OK.
In this case, we recommend that your
heating contractor carries out a simple
tightness test during the commissioning
of your system. For this it would be suf-
ficient to check the CO
tration in the combustion air at the annu-
lar gap of the balanced flue pipe.
If the CO concentration is less than
2
0.2 % or the O concentration is greater
2
than 20.6 %, the flue pipe is deemed to
be sufficiently gas tight.
If actual CO values are greater or O
2
values are lower, then pressure test the
flue pipe with a static pressure of
200 Pa.
or O concen-
2 2
2
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