Viessmann Vitocrossal 200 Service Instructions Manual page 18

Initial start-up, inspection, maintenance
Further details regarding the individual steps
18
(cont.)
3. If the CO content must be
2
adjusted:
Remove cover B.
Turn adjusting screw A in small
increments (Torx 40) until the
CO content reaches the stipu-
2
lated range:
Turning clockwise
CO content rises
2
Turning anti clockwise
CO content drops
2
4. Record the actual value in the
report (on page 60).
Recheck the values
Regulate to the upper and lower
output using the burner control unit.
If the values do not match the per-
missible CO content according to
2
the table on page 16, repeat the
steps for the upper and lower out-
put.
5. Press "S"E and " "D simulta-
neously. The burner is now in oper-
ating mode.