Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual page 18

Commissioning, inspection, maintenance
Checking the CO
3. Check control cables:
■ Connection and kink-free routing
■ Application and seating of retaining clips
4. If the CO content needs adjusting:
2
Turn adjusting screw
tinue turning until CO
specified range.
■ Turn towards " "
–
CO content falls.
→
2
Turn towards "+"
■
CO content rises.
→
2
CO test at the lower heating output
2
B A
Fig. 10
1. Press until the service display has counted down
to "0" (lower heating output).
2. Check the CO content at the flue pipe.
2
For permissible CO content, see above table
2
(page 17).
Note
At the lower heating output, the CO
always be lower than at the upper heating output.
18
content
(cont.)
2
in small increments. Con-
A
content falls within the
2
content must
2
5. Enter actual value into the report in the appendix.
3. If the CO content needs adjusting:
2
Turn adjusting screw B
Continue turning until CO
specified range.
■ Turn towards " "
–
CO content falls.
→
2
Turn towards "+"
■
CO content rises.
→
2
4. Enter actual value into the report in the appendix.
in very small increments.
content falls within the
2