Hope this is of some use to you, taken from mid 80's oil fired cooker subsequently converted to electric so surplus to requirements. I've reproduced the lighting instructions below in case you cannot read it clearly, thanks to Aga for this.
To light the burner...
On lighting, the flames will gradually come up and burn yellow, but will soon die down. It will take about 20-30 minutes for the burner to become hot before oil will vaporise properly. Observe through the sight glass on the inner door for the condition of the flame when it has settled down, which should be burning blue with the shells incandescent.
On lighting condensation will form in the flue way and may run onto the top plate from the flue chamber, this should be wiped off to prevent the possibility of damage to the vitreous enamel.
NEVER RELIGHT A REALLY HOT BURNER.
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