75
10 Appendix
10.3 Avoiding EMC Effects
The proper installation normally prevents from the EMC-adverse effects. In exceptional cases
it may be necessary by not traceable and /or not removable sources of interference to find an
adequate grounding point for the shielding.
1 In exceptional cases it is possible, that through the protected earth an interference level is
injected into the shielding. Unmotivated fault shut-downs (especially with low wanted sig-
nal) or temporary extraneous light may occur. In this cases the following may help beside
the fault clearance of the protected earth.
– a disconnection of the flame sensor shielding from the protective earth terminal at the
ETAMATIC OEM and the connection with the GND of the flame sensor (terminals 22
or 44)
– In rarely cases the shielding may be disconnected like described in section a) and the
sensor housing may be grounded at the burner plate.
2 Adverse effects through coupling into the laid cable may be eliminated normally only with
the correct laying and in some cases with an adequate grounding point.
3 Adverse effects straight to the flame sensor may be suppressed with the reduction of the
sensitivity when there is a sufficient flame signal.
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