Viessmann Vitodens 050-W Installation And Service Instructions Manual page 28

Commissioning, inspection, maintenance
Further details regarding the individual steps
28
(cont.)
5. Set the lower heating output and
check the CO
2
The CO content must be between
2
0.3 and 0.9 % below the value for the
upper heating output.
6. ■ If the CO content is within the
2
given range, continue with point 8.
■ If the CO content is outside the
2
given range, check the balanced
flue system for tightness; remedy
any leaks.
Replace gas train if required.
7. Check the CO
2
upper and lower heating output.
8. Shut down the boiler, remove the flue
gas analyser and cap flue gas test
port A.
content.
content again for