Checking The Ionisation Current - Viessmann VITOCROSSAL 200 Service Instructions Manual

Further details regarding the individual steps

Checking the ionisation current

01. Switch OFF the mains isolator.
02. Pull ionisation cable plug C.
03. Switch ON the mains isolator.
There must be a fault shutdown
after the burner has tried to start.
Display B flashes fault code "F
25".
04. Switch OFF the mains isolator.
Note
Test cable no.1 is required when
checking with the Testomatik-Gas.
You can also carry out this test with
a multimeter.
05. Join ionisation cable plug C and
adaptor D.
06. Push test cable socket A onto the
ionisation electrode.
A
D C
Commissioning, inspection, maintenance
07. Switch the mains isolator ON and
press reset.
08. Check the ionisation current.
Note
The ionisation current should be at
least 3 µA for approx. 2 to 3 s after
the gas valve has been opened and
during operation.
09. Record the actual value in the report
(on page 61).
10. Switch the mains isolator OFF,
remove the test equipment and
reconnect the ionisation cable con-
nectors.
11. Switch ON the mains isolator.
(cont.)
B
19