Viessmann VITOCROSSAL 200 Service Instructions Manual page 15

Further details regarding the individual steps
Commissioning, inspection, maintenance
(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 falls
2
4. Record the actual value in the
report (on page 61).
Rechecking 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 13, repeat the
steps for the upper and lower out-
put.
5. Briefly press "S" E and "-" D
simultaneously. The burner con-
tinues to the original modulation
level, at which the status "d" (= con-
trol stop) was initiated. The burner
then returns to operating mode.
15