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MMD900.1 - Oil Burner Safety Control
For 2-stage oil burners with a blue flame
Flame detector: IRD 1010
QRC 1... (LANDIS+GYR)
The release of valve 2 is delayed in such a way that the mixing zone of the burner is at the right temperature so that the 2nd stage can se properly added.
At flame failures shortly after the safety time, the control box goes to lockout | 
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