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Measuring the CO
Adjusting screws on the gas train
B
A
Fig. 8
Note
Check measurements and settings with a clean air fil-
ter.
01. Check the gas control cables:
Connection and kink-free routing
■
Fixing and firm seating of the connecting points
■
Note
See chapter "Checking the gas control cables",
Fig. 2, page 11.
02. Open the gas shut-off valve.
03. Activate emissions test mode.
Vitotronic control unit operating instructions
04. On the burner control unit, press S+ simultane-
ously for longer than 2 s.
"P" is displayed under "Status" (controlled stop).
■
■
The current modulation level in % is shown
under "Service".
05. To measure the CO2, set the upper and lower
heating output in turn:
Upper heating output:
■
Press
until "100" (
"Service".
■
Lower heating output:
≙
Press
until "0" (
ice".
content
(cont.)
2
≙
100 %) is shown under
0 %) is shown under "Serv-
Commissioning, inspection, maintenance
06. Check the CO
content at the flue pipe.
2
For permissible CO
content, see the table.
2
Note
At the lower heating output, the CO
always be lower than at the upper heating output.
07. If the CO
content lies outside the specified range:
2
■
Upper heating output:
Turn main adjusting screw
ments until the CO
2
fied range.
Note
Adjusting the upper heating output changes the
CO
value of the lower heating output simultane-
2
ously.
Lower heating output:
■
Slide the shut-off slider on the gas solenoid
valve to the left and turn offset adjusting screw
in small increments until the CO
B
within the specified range.
Rotational direction of adjusting screws
and
:
B
■
Direction "
": CO
content falls.
–
2
Direction "+": CO
content rises.
■
2
Note
Especially at the lower heating output, the system
responds sluggishly to CO
making a change, wait a few minutes until the gas
solenoid valve has adjusted to the new value.
content must
2
in small incre-
A
content is within the speci-
content is
2
A
adjustments. After
2
17
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