On call for heat from the thermostat, the ignition control starts the burner blower this mechanically interlinked with the oil pump..
The blower blows air into the chamber and the oil pump pumps oil to the nozzle.
The transformer is energized and applies voltage spark to the ignitor.
By the inside the combustion chamber, When the flame is detected it's detected by cell eye.
After the cell eye detects the light from the flame it signals the ignition control that all is well and to keep things going.
The burner will continue to produce flame until either the cell eye determines there is no flame or the thermostat satisfies and stops the call for heat.
If it's the thermostat stopping the call for heat the ignition control stops the blower and the in the chamber extinguishes.
The in the furnace, continues to run...
This makes use of the residual heat inside the exchanger and allows things to cool off.
When the inside the exchanger cools down to certain set shuts off the blower..
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