Viessmann VITOCROSSAL 200 Service Instructions Manual page 16

Commissioning, inspection, maintenance
Further details regarding the individual steps
B A
16
(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 reaches 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 65).
!
Please note
The CO
be lower in partial load than it
is in full load.
Rechecking the values
Regulate again to the upper and
lower output using the burner control
unit. If the values do not match the
permissible CO
the table on page 14, repeat the steps
for the upper and lower output.
5. Briefly press "S" E and "-" D simul-
taneously. The burner continues to
the original modulation level, at which
the status "d" (= control stop) was ini-
tiated. The burner then returns to
operating mode.
content must always
2
content according to
2
2