Checking The Flue Gas Temperature 13. Displaying The Ionisation Current - Viessmann Vitocrossal 200 Service Instructions For Contractors

Checking the CO
Fig. 17
Checking the CO content
Checking the flue gas temperature
Displaying the ionisation current
Note
The ionisation current must be called up via the burner
control unit. It is not possible to measure the ionisation
current using the Testomatik-Gas or a multimeter.
01. Press S approx. 2 s , " " flashes.
02. Press until "5" is shown under Service.
03. Press S. "5" will be displayed under Status.
04. Press until "3" is shown under Service.
05. Press S. "3" is shown under Status, and during
operation the ionisation current is shown under
Service (e.g. 30 = 3.0
06. Start the burner with the emissions test switch.
content
(cont.)
2
A).
µ
Commissioning, inspection, maintenance
3. If the CO content needs adjusting:
2
■ Undo cover .
B
■ Turn adjusting screw
(Torx 40). Continue turning until CO
ches the specified range:
– Turning clockwise
CO content rises
→
2
– Turning anti-clockwise
CO content falls
→
2
4. Enter actual value into the report in the appendix.
Rechecking the values
Regulate to the upper and lower heating output
again using the programming unit in the burner
control unit. If the values do not match the permis-
sible CO content according to the table: repeat the
2
steps for the upper and lower heating output.
5. Hold down S and
E
ger than 2 s. The burner will change to the operat-
ing mode.
07. Read the ionisation current.
Note
The ionisation current should be at least 3
approx. 2 to 3 s after the gas train has been
opened and during operation.
08. Record the actual value in the report.
09. Press S approx. 2 s , " " flashes.
10. Press until "5" is shown under Service.
11. Press S. "5" will be displayed under Status.
12. Press until "0" is shown under Service.
13. Press S. The operating display will be shown
again.
in small increments
A
content rea-
2
simultaneously for lon-
D
A for
µ
19