Viessmann VITOCROSSAL 200 Service Instructions Manual page 18

Commissioning, inspection, maintenance
Further details regarding the individual steps
18
(cont.)
3. If the CO content must be adjusted:
2
■ Remove cover B.
■ Turn adjusting screw A in small
increments (Torx 40) until the CO
content falls within the specified
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 heat-
ing output using the programming
unit in the burner control unit. If the
values do not match the permissible
CO content according to the table on
2
page 16, repeat the steps for the
upper and lower heating output.
5. Press "S" E and "-" D simultane-
ously. The burner is now in operating
mode.
2