Viessmann VITODENS 111-W Installation And Service Instructions Manual page 44

Commissioning, inspection, maintenance
Further details regarding the individual steps
44
04. Adjust the upper heating output:
Turn rotary selector "tr" fully
clockwise, until the display shows 5
bars for the upper heating output.
05. Check the CO
heating output.
The CO content must be between
2
7.0 and 10.5 %.
06. Adjust the lower heating output:
Turn rotary selector "tr" fully anti-
clockwise, until the display shows 1
bar for the lower heating output.
07. Check the CO
heating output.
The CO content must be between
2
0.3 and 0.9 % below the value for
the upper heating output.
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 balanced
flue system for tightness; remove
any leaks.
Replace gas train if required.
09. Test the CO
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.
(cont.)
content for the upper
2
content for lower
2
content for upper and