Viessmann VITODENS 100-W Installation And Service Instructions Manual page 28

Commissioning, inspection, maintenance
Further details regarding the individual steps
28
(cont.)
06. Adjust the lower output:
Turn rotary selector "tr" to the
control range on the left until the dis-
play shows 1 bar for the lower out-
put.
07. Test the CO
2
put.
The CO content must be between
2
0.3 and 0.9 % below the value for
the upper 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 and rec-
tify any leaks.
Replace gas train if required.
09. Test the CO
2
lower output again.
10. Shut the boiler down, remove flue
gas analyser and close flue gas port
A.
11. Return rotary selectors "tw" and
"rt" to their original positions.
content for lower out-
content for upper and