Viessmann VITODENS 100-W Installation And Service Instructions Manual page 27

Further details regarding the individual steps
Commissioning, inspection, maintenance
(cont.)
06. Adjust the lower heating output:
Turn rotary selector "tr" to the
control range on the left until the dis-
play shows 1 bar for the lower heat-
ing output.
07. Check CO content for the lower
2
heating output.
The CO content must be approxi-
2
mately 0.3 to 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 flue gas/
ventilation air system for tight-
ness; remedy any leaks.
Replace gas train if required.
09. Check the CO
2
and lower heating output again.
10. Shut down the boiler, remove the
flue gas analyser and cap flue gas
aperture A.
11. Turn both rotary selectors "tw" and
"rt" into their respective original
positions.
content for upper
27