Setting The Maximum Heating Output; Tightness Test On Balanced Flue System (Annular Gap Check) - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

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.

Tightness test on balanced flue system (annular gap check)

A
Fig. 25
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.
34
concentration in the com-
2
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.
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.
"
A
2
values are
2