The flame of the burner is unstable and then automatically reburning after extinguishing

This is generally caused by insufficient fuel supply. If the diesel oil supply is not timely when the burner is working, it will inevitably lead to fire-fighting after oil cut-off. After the fire is extinguished, the flame sensor is in a high impedance state. The controller orders to stop the fuel injection and pre blow for about 10s, and then start the fuel injection. If the burner can be set up and reignited. If the diesel still cannot be supplied after the start of injection and the normal ignition cannot be achieved, the controller will automatically take measures to stop the injection and ignition after a delay of about 10s, and the air supply motor will also stop working and the red warning light will be on. After waiting for 1-2min, the thermal delay is over, and the red light can be reset manually to start the next ignition process automatically.

When the fuel oil supply is insufficient, the sound of "wheezing and wheezing" is often accompanied by the flame. At this time, the liquid in the oil supply pipeline may be accompanied by bubbles, which makes the injection pressure unstable and combustion unstable. In addition, when there is air bubble in the oil pipe, the running resistance of the oil pump will increase or decrease with it. When the fire is unstable, there is often black smoke.Because, the oil pressure can not be established when the oil supply is insufficient, so that the diesel fuel can not be completely combusted due to poor atomization.

The common causes of unstable fire are as follows:

When the oil pipe leaks, the external air will enter the oil pipe to form bubbles;

The oil pipe is narrow, blocked and compressed, which makes the oil path blocked and the diesel supply insufficient;

The filter screen of the oil supply system (including the inlet filter screen of the oil suction pipe, diesel filter element, oil pump filter screen, etc.) is blocked.

In winter, the oil supply system is often blocked, because of the poor fluidity of diesel oil when the temperature is low, it is easy to precipitate wax, which blocks the pipeline, diesel filter element, oil pump filter screen, nozzle filter screen, etc., making the oil supply system not smooth, causing unstable fire or fire fighting. If the temperature in the workshop is low, the oil supply pipeline can be heated with a baking lamp, especially the oil pump, filter element and other parts. When ignition is difficult, the air inlet can be baked to preheat the air inlet.