Viessmann B2TF - Page 56

56
Permissible CO
2
or O
2
content
Operation with natural gas
Rated heating out-
put (kW)
CO
2
content (%) O
2
content (%)
Upper heating out-
put
Lower heating out-
put
Upper heating out-
put
Lower heating out-
put
11
7.3 - 10.5 7.5 - 10.5 2.1 - 7.9 2.1 - 7.6
19 7.5 - 10.5 7.5 - 10.5 2.1 - 7.6 2.1 - 7.6
25 7.5 - 10.5 7.5 - 10.5 2.1 - 7.6 2.1 - 7.6
32 7.3 - 10.0 7.5 - 10.5 3.1 - 7.9 2.1 - 7.6
Operation with LPG
■
CO
2
content: 8.4 - 11.8 %
■
O
2
content: 3.1 - 8.1 %
If the actual CO
2
or O
2
values lie outside their respec-
tive ranges, proceed as follows:
■
Check the balanced flue system for leaks; see
page 43.
■
Check ionisation electrode and connecting cable.
Note
During commissioning, the combustion controller car-
ries out an automatic calibration. Only measure the
emissions approx. 50 s after the burner has started.
A
Fig. 47
1.
Connect a flue gas analyser at flue gas port
A
on
the boiler flue connection.
2. Open the gas shut-off valve. Start the boiler. Cre-
ate a heat demand.
3. Adjust the lower heating output. See the following
chapter.
4. Check the CO
2
content. If the actual value deviates
from the permissible ranges, implement steps lis-
ted above.
5. Enter the actual value into the report.
6. Adjust the upper heating output. See the following
chapter.
7. Check the CO
2
content. If the actual value deviates
from the permissible ranges by more than 1 %,
implement steps listed above.
8. Enter the actual value into the report.
9.
Re-seal test port
A
.
Danger
Escaping flue gas can damage your health.
Check test port
A
for leaks.
Selecting the upper/lower heating output
Note
Ensure adequate heat transfer.
Tap the following buttons:
01.
02. "Service"
03. Enter password "viservice".
04. Use to confirm.
05. "Actuator test"
06. Use to confirm.
Commissioning, inspection, maintenance
Checking the combustion quality (cont.)
6151778