Co Test At The Lower Heating Output; Displaying The Ionization Current - Viessmann Vitocrossal 200 CM2 500 Service Instructions Manual

Vitocrossal 200, CM2 400, 500 and 620 Service
Steps – Commissioning, Inspection and Maintenance
CO Test at the lower heating output
2
1. Press button G until the service display B has
B
counted down to "0" (lower heating output).
2. Check the CO level at the flue pipe.
2
Boiler Model Permissible CO
NG
400
8.5 ! 0.2
500
8.5 ! 0.2
620
8.5 ! 0.2
Note: The CO content must always be lower in partial
2
load than it is in full load.
3. If the CO content must be adjusted:
2
■ Remove cover B (see illustration below)
■ Turn adjusting screw A (see illustration below) in
small increments (Torx 40) until the CO
within the specified range:
- Turning clockwise → CO
(more gas)
- Turning counter-clockwise → CO
(less gas)
4. Record the actual value in the report (on page 71).
Rechecking the values:
Regulate again to the upper and lower heating output using
the burner programming unit. If the values do not match the
permissible CO content according to the table, repeat the
2
steps for the upper and lower heating output.
5. On the burner control press S F and
simultaneously for more than 2 seconds. The burner
will change to the operating mode.
content in % @ Low-Fire
2
LPG
10.1 ! 0.2
10.1 ! 0.2
10.1 ! 0.2
content falls
2
content increases
2
content falls
2
G
B
Commissioning, Inspection, Maintenance
(continued)

Displaying the ionization current

Note: The ionization current must be called up via the
burner control unit. It is not possible to measure
the ionization current using a multimeter.
1. Press button S F, hold for more than 2 seconds and
the " " in the display area D will flash.
2. Press button E until "5" appears in the service
Y
display B.
3. Press button S F and "5" will appear in the status
display A.
4. Press button E until ".3" appears in the service
Y
display B.
5. Press button S F and "3" will appear in the status
display A (during operation the ionization current is
displayed under service display B (e.g. 30 = 3.0 μA).
6. Start the burner with the emissions test switch at the
boiler control unit.
7. Read the ionization current.
Note: The ionization current should be at least 3 A
for approximately 2 to 3 seconds after the gas
valve has been opened and during operation.
8. Record the actual value in the report (on page 71).
9. Press button S F, hold for more than 2 seconds and
the " " in the display area D will flash.
10. Press button E until "5" appears in the service
Y
display B.
11. Press button S F and "5" will appear in the status
display A.
12. Press button E until "0" appears in the service
Y
display B.
13. Press button S F to switch to the operating display.
19