Checking The Ionisation Current - Viessmann VITOCROSSAL 200 Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Checking the ionisation current

1. Switch OFF the main isolator.
2. Pull ionisation current cable plug
C.
3. Switch ON the main isolator.
There must be a fault shutdown
after the burner has tried to start.
Fault code "F A7" flashes in dis-
play B.
4. Switch OFF the main isolator.
Note
Test cable no.1 is required when
checking with the Testomatik-
Gas. You can also carry out this
test with a multimeter.
5. Push ionisation current cable plug
C into adaptor D.
16
(cont.)
6. Push test cable socket A onto
the ionisation electrode.
7. Switch the main isolator ON and
press reset.
8. Check the ionisation current.
Note
Approx. 2 to 3 s after the gas
valve has been opened and dur-
ing operation, the ionisation cur-
rent should be at least 3 µA.
9. Record the actual value in the
report (on page 61).
10. Switch the main isolator OFF,
remove the test equipment and
reconnect the ionisation cable
plug-in connectors.
11. Switch ON the main isolator.