Checking The Flue Gas Temperature 17. Displaying The Ionisation Current - Viessmann VITOCROSSAL 200 Service Instructions Manual

Further details regarding the individual steps
2. Check the CO content at the flue
2
pipe.
Rated heating Rated heat input
output
P (50/30 °C) Q
max
cv]
in kW
400
500
620
2. Note
In the partial load range, the CO
tent must always be at least 0.3 %
lower than under full load.
3. If the CO content has to be adjus-
2
ted:
Undo cover B and turn setting screw
A in small steps (Torx 40) until the
CO content lies within the specified
2
range:
■ Turning clockwise → CO
increases
■ Turning anti-clockwise → CO
tent drops
Displaying the ionisation current
Note
The ionisation current must be called up
via the burner control unit. It is not pos-
sible to measure the ionisation current
using the Testomatik-Gas or a multime-
ter.
01. Press S approx. 2 s , " " flashes.
(H ) [net Q
min i max
[net cv]
in kW
76
95
119
con-
2
content
2
con-
2
Commissioning, inspection, maintenance
Permissible CO
(H ) Natural gas E
i
in kW
381
474
593
4. Record the actual value in the report
(on page 86).
Rechecking the values
Regulate to the upper and lower heat-
ing output again using the program-
ming unit in the burner control unit. If
the values do not match the permis-
sible CO content according to the
2
tables on pages 28 and 29, repeat the
steps for the upper and lower heating
output.
5. Hold down S E and
neously for longer than 2 s. The
burner will change to the operating
mode.
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.
(cont.)
content
2
LPG P
in %
8.5 ±0.2 10.1 ±0.2
D simulta-
in %
29