Burner fuel oil pump and motor
The fuel oil pump is a gear-wheel pump which provides an operating pressure up to 30 bar. The fuel oil pump is equipped with a built-in pressure regulator with a fast working valve to keep a constant pressure. An illustration of the burner fuel oil pump is shown in Figure 1.
The oil line on the suction side of the pump must be primed and the pump vented before commissioning, otherwise the pump will be damaged due to cavitation. For oil pump venting, loosen the gauge connection/venting plug (7) after which the burner should operate for a while. Air comes out of the hole in bubbles. Retighten the plug carefully when there are no more bubbles (do not remove the plug from the hole).
The viscosity of the oil to the pump should be between 4 – 70 cSt. The diagram in Figure 2 shows the required oil inlet pressure and temperature to the pump.
In order to make the final adjustment of the oil pressure the burner must be running in normal operation.
If the boiler plant has been shut down for a period of time and the plant is started from cold conditions the following procedures must be taken into consideration:
The coupling is mounted between motor and oil pump so that by moving the coupling head on the oil pump shaft there should be an axial play of 1 – 2 mm. Before adjusting the coupling remove the air dampers. Loosen four fixing screws and let the dampers come out of the burner housing. Figure 3 illustrates the pump coupling
If the fuel oil pump breaks down, it should be exchanged with a new fuel oil pump alternatively with an overhauled spare pump. Aalborg Industries cannot recommend that the user repairs it. The defective pump should be sent for repair.
Figure 4 illustrates the interior parts of the burner motor, fan, shaft, and oil pump. In case the burner motor must be exchanged the following work procedures should be carried out:
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