Solenoid Valve - MCS XL 9ERM Manuel D'utilisation Et De Maintenance

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The pump is connected to the motor shaft through a plastic pump joint shown here on the side. This
component safeguards the motor operation if the pump were to seize up. In this case, the stall torque would
effectively increase along with the absorbed current and the pump joint, breaking, would avoid further
damage to the motor.

Solenoid valve

The solenoid valve is an electromagnetic device. It is integrated in the fuel pump and its purpose is to
intercept the flow of fuel going from the pump to the nozzle. When the flame control appliance gives consent,
the solenoid valve is powered and therefore opens, allowing the fuel to reach the nozzle, otherwise, when the
machine is turned off, the solenoid valve is no longer powered and therefore closes, blocking the fuel flow and
therefore interrupting the flame. There are two solenoid valve models based on the type of power supply.
Figure 8 - Solenoid valve integrated in the fuel pump.
Fuel pump maintenance
If the fuel does not reach the nozzle, it may be that the pump has seized and/or that the joint is broken. In this
case, loosen the three screws blocking the pump and verify the condition of the pump joint. Make sure that
the pump has not seized up. If the joint is broken, replace it with an original joint according to the type of
motor. If the pump's shaft has seized, replace it. If the pump starts to squeal and does not working correctly,
it may be that the filtering element is clogged. Proceed by removing it (see Fig. 5 and Fig. 6) and clean it
using clean fuel. Make sure that the fuel used to wash the filter is the same type of fuel used for the heater
operation. If it is not available, use compressed air. Be careful not to ruin the filtering element structure. Pay
attention when performing repairs on the pump because it works at high pressure.
800 292-3279
IMPORTANT: If the pump joint breaks, replace it
with an original spare part.
Figure 7 - Pump joint.
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