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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Service
Displaying Ionization Current
1. Press button S for approx. 2 sec., „ “ will blink.
2. Press button until “5” appears under Service.
3. Press button S. “5” will appear under Status.
4. Press button until “3” appears under Service.
5. Press button S. “3” will appear under Status and the
ionization current in operation will be indicated under
Service (i.e. 30 = 3,0
μ
A).
6. Put burners into operation with chimney sweep test-
switch.
7. Take ionization current reading.
8. Record measurement reading in log.
9. Press button S approx. 2 sec, „ “ will blink.
10. Press button until “5” appears under Service.
11. Press button S. “5” will appear under Status.
12. Press button until “0” appears under Service.
13. Press button S. The operating status indicator appears
again.
IMPORTANT
Ionization current must be queried via the burner control
unit. An ionization current measurement with Testomatic
Gas or a multimeter is not possible.
IMPORTANT
Turning the System Off
The ionization current must reach a minimum of 3
μ
A for approximately 2 to 3 sec. after opening of the
combination gas valve and while in operation.
1.
Turn off main power switch or power supply voltage
and ensure against being unintentionally switched on
again.
WARNING
Power supply voltage is dangerous and may cause
life-threatening injury. The system must be disconnected
from the power supply before maintenance work is
performed.
2. Close central gas shut-off valve.
