Viessmann VITODENS 111-W Installation And Service Instructions Manual page 30

Commissioning, inspection, maintenance
Checking the CO
A
Fig. 21
1. Connect a flue gas analyser at flue gas port
the boiler flue connection.
2. Start the boiler and check for leaks.
Danger
Escaping gas leads to a risk of explosion.
Check all gas equipment for tightness.
3. To check the CO content the burner output can be
2
adjusted manually.
1. Tap MODE.
2. / until "SERV" is displayed.
3. OK to confirm.
OFF appears on the display. Test mode is then
not activated.
4. Use / to select the burner output:
Shown on
display
OFF
_ 20
_ _ 40
_ _ _ 60
_ _ _ _ 80
_ _ _ _ _ 100
5. Confirm your setting with OK.
The bars stop flashing.
30
content
(cont.)
2
A on 4. Check the CO
5. Check the CO
6.
7. Re-check the CO
Burner output
0 %
8. Terminate test mode:
20 %
40 %
60 %
80 %
100 %
9. Shut down the boiler, remove the flue gas analyser
content for the upper heating out-
2
put (100 %).
For CO content limits, see page 22.
2
content for the lower heating output
2
(20 %).
The CO content must be between 0.3 and 0.9 %
2
below the value of the upper heating output.
If the CO content is within the indicated range,
■
2
continue with point 8.
■ If the CO content lies outside the indicated
2
range, check the balanced flue system for tight-
ness; remedy any leaks.
Replace gas train if required.
content for the upper and lower
2
heating output.
1. / until "SERV" flashes.
2. OK to confirm.
The selected value flashes.
3. until OFF flashes.
4. OK to confirm.
When "SERV" disappears, test mode is termi-
nated.
and close flue gas test port A .