Setting The Max. Heating Output; Tightness Test On Balanced Flue System (Annular Gap Check) - Viessmann Vitodens 242-F Installation And Service Instructions Manual

Setting the max. heating output

The maximum output for heating operation can be
limited. The limit is set via the modulation range. The
max. adjustable output is limited upwards by the boiler
coding card.
Service menu
1. Press OK and simultaneously for approx. 4 s.
å
2. "Service functions"

Tightness test on balanced flue system (annular gap check)

Fig. 37
Combustion air aperture (ventilation air)
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.
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.
concentration in the com-
2
Commissioning, inspection, maintenance
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.
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 higher or actual O
2
lower, a pressure test with a static pressure of 200 Pa
will need to be carried out on the flue pipe.
2
values are
2
47