Viessmann VITODENS 100-W Installation And Service Instructions Manual page 29

Further details regarding the individual steps
Commissioning, inspection, maintenance
(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; remove any leaks.
Replace gas train if required.
09. Test the CO content for upper and
2
lower heating output again.
10. Shut the boiler down, remove flue
gas analyser and close flue gas port
A.
11. Turn both rotary selectors "tw" and
"rt" simultaneously into their orig-
inal positions.
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