Viessmann VITODENS 111-W Installation And Service Instructions Manual page 28

Commissioning, inspection, maintenance
Further details regarding the individual steps
28
(cont.)
08. ■ If the CO content is within the
2
given range, continue with point
10.
■ If the CO content is outside the
2
given range, check the flue gas/
ventilation air system for tight-
ness; remedy any leaks.
Replace gas train if required.
09. Check the CO
and lower heating output again.
10. Shut down the boiler, remove the
flue gas analyser and cap flue gas
port A.
11. Turn both rotary selectors "tw" and
"rt" to their original positions.
content for upper
2