Siemens LMV60.110A2 Installation Manual page 31

Burner management system for forced draft burners with the main functions
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If the mechanical connections for the burner housing have a high level of impedance –
e.g., due to paint – this causes multiple poor flows of current from the ignition spark
back to the ignition transformer. These multiple current flows lead to high EM
emissions (EMC).
Figure 25: 1-pole ignition with high impedance of the burner housing
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