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

Max. heating output setting

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. 23
Combustion air aperture
A
Commissioning, inspection, maintenance
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.
For balanced flue systems tested together with the wall
mounted gas fired boiler, the requirement for a tight-
ness test during commissioning by the flue gas inspec-
tor is not applicable.
We recommend that your heating engineer 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 combustion air at
2 2
the annular gap of the balanced flue pipe.
The flue pipe is deemed to be gas-tight if the CO
centration in the combustion 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
then pressure test the flue pipe with a static pressure
of 200 Pa.
"
A
con-
2
%
.
%
values are lower,
2
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