MCS XL 9ERM Manuel D'utilisation Et De Maintenance page 33

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E. Dirty fuel filter.
The filtering element is contained inside the plastic cup of the fuel filter. Remove the plastic cup of the fuel
filter from the rest of the aluminium body by unscrewing it:
1. Remove the filtering element from the cup.
2. Inspect the filtering element and the inside of the cup to search for any water or dirt.
3. Rinse the cup using clean fuel and compressed air.
4. Clean the filtering element using clean fuel and compressed air.
5. If the meshes on the filtering element are damaged, replace them.
F. Dirty or damaged nozzle.
1. Follow the same procedure previously described in the "Dirty or damaged nozzle" section.
G. Incorrect pump pressure.
1. Follow the instructions contained in the "Incorrect pump pressure" section.
H. Defective solenoid valve
Before attempting this test, remove the high voltage wires from the
electrodes. This will avoid injury resulting from accidental heater ignition.
1. Loosen the screw blocking the burner to the combustion chamber.
2. Remove the burner from its seat.
3. Remove the sleeve from the burner.
4. Remove the electrode-flame disc unit from the nozzle holder and detach the high voltage cables of the
transformer.
5. Check that fuel comes out of the nozzle. To do this, connect the heater to the electrical power, verify that
the 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 and follow the subsequent
steps.
6. Disconnect the plug connected to the solenoid valve (A Fig. 27).
7. Connect the terminals of the ohmmeter that must now be set as a VAC voltmeter, to connection (D) and
(E) of the plug (A).
Figure 27 - Electronic connections to the solenoid valve.
C. D.
A. B.
800 292-3279
ATTENTION!!!
A. Connection plug to the valve or solenoid valve, B. Solenoid
E.
valve or solenoid valves, C. Yellow-green earthing connection, D.
Phase connection, E. Neutral connection.
8. Connect the heater to the power mains voltage and turn it on.
9. 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.
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