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| 1. The service switch is “on”. | |||
| 2. The remote switch is turned “on”. | |||
| 3. There is a “call” for heat (interior, domestic water, engine coolant). | |||
| 4. The igniter is glowing. | |||
| 5. The combustion air intake fan in the furnace is running. | |||
| 6. The system circulation pump is running. | |||
| 7. The fuel pump delivers fuel. | |||
| 8. The compressor turns on. | |||
| 9. The fuel valve opens and fuel is drawn into the air-aspirating nozzle. | |||
| 10. The fuel is atomized and sprayed into the combustion chamber. | |||
| 11. Combustion is started. | |||