Setting The Maximum Heating Output; Checking The Balanced Flue System For Tightness (Annular Gap Check) - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Setting the maximum heating output

The maximum output for heating operation can be
limited. The limit is set via the modulation range. The
max. adjustable heating output is limited upwards by
the boiler coding card.
Weather-compensated control unit
Service menu
1. Press OK and simultaneously for approx. 4 s.
å
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 heating output.
5. Set the required value.

Checking the balanced flue system for tightness (annular gap check)

A
Fig.27
Combustion air aperture
A
For balanced flue systems tested together with the
heat source, there is no requirement for a tightness
test (overpressure test) during commissioning by the
flue gas inspector.
34
Constant temperature control unit
Service menu
1. Press OK and simultaneously for approx. 4 s.
å
2. Select " " with and confirm with OK.
3
Ú
A value flashes on the display (e.g. "85") and "
appears. In the delivered condition, this value repre-
sents 100 % of rated heating output.
3. Select required value and confirm with OK.
In this case, we recommend that your heating contrac-
tor carries out a simple tightness test during the com-
missioning of your system. For this it would be suffi-
cient to check the CO or O
2
bustion 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.
If actual CO values are greater or O
2
then pressure test the flue pipe with a static pressure
of 200 Pa.
"
A
concentration in the com-
2
2
values are lower,
2