Viessmann Vitocrossal 200 Service Instructions For Contractors page 18

Commissioning, inspection, maintenance
Checking the CO
CO test at the lower heating output (87 kW)
2
Fig. 11
18
content
(cont.)
2
4. If the CO
Turn adjusting screw
tinue turning until CO
specified range.
■
■
Note
The adjusting screw has no end-stop. The starting
position will be reached again after 4 turns.
5. Enter actual value into the report in the appendix.
1. Press
to "0" (lower heating output).
2. Check the CO
For permissible CO
Note
At the lower heating output, the CO
always be lower than at the upper heating output
by a given amount. See the table above.
3. If the CO
■
■
4. Enter actual value into the report in the appendix.
5. Check the CO
heating output again.
If the CO
Repeat steps for upper and lower heating output.
6. Hold down S and
2 s. Burner switches to operating mode.
content needs adjusting:
2
in small increments. Con-
A
content falls within the
2
Turning clockwise
CO content falls
→
2
Turning anti-clockwise
CO content rises
→
2
until the service display has counted down
content at the flue pipe.
2
content, see above table.
2
content needs adjusting:
2
Undo cover B .
Turn adjusting screw in small increments
A
(Torx 40). Continue turning until CO
ches the specified range:
Turning clockwise
–
CO content rises
→
2
– Turning anti-clockwise
CO content falls
→
2
content at the upper and lower
2
content is not within the specified range:
2
simultaneously for longer than
content must
2
content rea-
2