21
conforming to the specifications (see previous point)
4. Check that high voltage cables are connected correctly
5. Connect secondary transformer outputs to the electrodes
6. Connect the heater to the electrical power supply
7. Verify if a spark strikes between the electrodes. If the earthing connection is done properly and if
there is no spark between the electrodes, the transformer is defective. NOTE: Pay attention because
the fact that there is no spark between the electrodes may also be a result of the ceramics of the
electrodes being broken. Before replacing the transformer therefore, verify the total integrity of the
electrodes and, only after making sure that there are no cracks in the electrode ceramics, replace the
transformer
C. Broken electrode
1. Follow the same procedure for the defective transformer and repeat the steps to determine whether
the electrodes are defective or not. If the spark is present in another place, besides the electrodes, it
means that the ceramics are broken. The electrode must therefore be replaced
D. Incorrect pump pressure
1. Follow the instructions contained in the “Incorrect pump pressure” section
E. Defective solenoid valve
1. Remove the upper mantle
2. Check that fuel comes out of the nozzle. In order to do this, connect the heater to the electrical power
supply, look through the head side plate and, while the machine's motor runs, verify that fuel is
atomised by the nozzle. If no fuel comes out, it means that the solenoid valve may be defective. To
define this, disconnect the heater from the electrical power supply and follow the subsequent steps
3. Disconnect the power supply cables from the solenoid valve
4. Connect the terminals of the ohmmeter, that must now be set as a VAC voltmeter, to the plastic.
socket powering the solenoid valve. To be precise, the terminals of the voltmeter are to be connected
to the two vertical faston connector sockets powering the respective metal faston connectors that
protrude from the solenoid valve
5. Connect the heater to the power mains voltage and turn it on
6. If the voltmeter records a voltage of 120 V actually sent to the solenoid valve faston connectors, this
means that it is certainly defective and must be replaced
F. Leak in the pump's suction circuit
1. Check the entire suction circuit and verify that there are no leaks. Each leak in this tract of the circuit
causes air to enter the suction circuit which works at a pressure that is less than the atmospheric
one. If this takes place, there may be pump pressure problems resulting in a difficult atomisation on
the part of the nozzle. In particular, check the seal of the plastic hoses and the diesel oil filter gasket
located between the cup and the filter body
ATTENTION!!!
Before attempting this test, remove the fan
from the motor and the high voltage wires
from the electrodes. This will avoid injury
resulting from fan rotation and accidental
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