Viessmann C3TB, Installation And Service Instructions For Contractors

Page: 75 / 188

75
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 of balanced flue system (annular gap test)
A
Fig. 69
A
Combustion air aperture (ventilation air)
Note
Only the gas condensing module may be operational
during the annular gap test procedure. Disable power
generation by the fuel cell module before starting the
test.
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.
Starting service mode
Start the service mode in order to carry out mainte-
nance work on the fuel cell module.
The fuel cell module will be shut down. Power genera-
tion will be interrupted.
Extended menu
1.
2.
"Fuel cell"
3. "Operating mode"
4. / for "Service mode"
5. / for "Activate service mode" "Yes"
Commissioning, inspection, maintenance
Setting the max. heating output (gas condensing…
(cont.)
5775 636 GB