Checking Ionisation Current - Viessmann MatriX radiant burner Service Instructions Manual

Further details regarding the individual steps

Checking ionisation current

1. Switch OFF the mains electrical
isolator.
2. Pull ionisation cable plug C off.
3. Switch ON the mains electrical
isolator.
There must be a fault shutdown
after a burner start has been
attempted. Display B flashes fault
code F 25.
4. Switch OFF the mains electrical
isolator.
Please note:
Test cable no. 1 is required when
checking with Testomatik−Gas
equipment.
You can also carry out this check with
a multimeter.
5. Push plug C of the ionisation
current lead into adaptor D.
Initial start−up, inspection and maintenance
A
D C
(cont.)
6. Plug socket A of the test lead
onto the ionisation electrode.
7. Switch the mains electrical
isolator ON and check the
ionisation current.
Please note:
Ionisation current
H min. 10 mA approx. 2 to 3 s after
opening the gas valve,
H min. 30 mA at full load,
H min. 5 mA at partial load.
8. Record the actual values in the
service report (from page 42).
9. Switch the mains electrical
isolator OFF , remove the test
equipment and reconnect the
plug connector of the ionisation
cable.
10. Switch ON the mains electrical
isolator.
B
13