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NORA Oilheat Technicians Manual

Chapter 9 Ignition Systems Designation Description Service Hints 1. 120V ac input wires Brings 120 volt to primary coil Wires must not be pinched against housing when transformer is closed 2. Primary coil Current in this coil generates a magnetic field 3. Iron core Transfers magnetic field into secondary coil 4. Secondary coil Magnetic field from core induces voltage in this coil 5. Insulating compound Keeps moisture out, conducts heat Should not be leaking out 6. Metal cover Protects internal of transformer Should not be punctured or severely dented 7. Mounting base plate Mounts transformer to Must not be bent and cause air to leak burner housing from around transformer 8. Transformer output Insulates high voltage from ground 1. Must not be cracked ceramic insulator and opposing terminal. Holds 2. Must be totally clean ignition spring dimensions 9. Ignition spring terminals Transmits high voltage to 1. Must make good, clean contact to electrode rods electrode rods 10. Electrode rods Transfers high voltage to electrode tips Must be clean 11. Electrode insulators Mounts electrodes and insulates Must be clean and not cracked each electrode from ground 12. Arc gap and electrodes Specified gap (1/8” - 5/32”) allows arc 1. Too close causes delayed ignition to jump to other terminal and ignite 2. Too wide results in no ignition and possible damage to secondary 3. Clean and properly adjust 9-16 Ignition Systems Figure 9-14: Ignition service help chart


NORA Oilheat Technicians Manual
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