Viessmann B2TA, Installation And Service Instructions For Contractors

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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 Constant temperature 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 heating output.
5. Set the required value.
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 delivered condition, this value repre-
sents 100 % of rated heating output.
3. Select required value and confirm with OK .
Tightness test on balanced flue system (annular gap check)
A
Fig. 25
A
Combustion air aperture (ventilation air)
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.
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
2
or O
2
concentration in the com-
bustion air at the annular gap of the balanced flue
pipe.
If the CO
2
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
2
values are higher or actual O
2
values are
lower, a pressure test with a static pressure of 200 Pa
will need to be carried out on the flue pipe.
Commissioning, inspection, maintenance
Setting the maximum heating output
5773 216 GB