Electrolux FMB330RGB0, Service Manual

Page: 6 / 27

6
Dispenser Operation
As the timer advances power is removed from the wax
motor, the plunger of the wax motor retracts, now the pin
at the opposite end falls in the rinse aid actuator. As it
does it follows a track down the back side of the actuator
to the bottom. The dispenser is now ready to dispense
the rinse aid. The timer again applies power to the wax
motor, extends the pivot arm raising the rinse aid actuator
to release rinse aid into the dishwasher. Finally, power is
removed. As the wax motor retracts, the pivot arm falls
on a leaf spring mounted to the side on the dispenser that
forces the actuator arm over to the starting position for the
next cycle.
Testing the Dispenser
The dispenser wax motor is activated by 120 volts and can
be function tested out side the product with an approved
service cord. When operating the dispenser with a service
cord be careful the wax motor will become very hot when
power is applied. This can cause a burn if touched.
1. Attach a service cord to the wax motor
2. Apply power and allow actuator to fully extend.
3. Disconnect power allow actuator to completely retract
4. Repeat to actuate rinse aid dispenser.
Wash operation
After the dishwasher is loaded, the proper amount of
detergent needs to be added to the detergent dispenser,
then close and latch dispenser cover. Detergent can now
to added to the top of the cover for pre wash if desired.
Next turn the timer to the desired cycle before closing the
door of the dishwasher. After closing the door the desired
cycle starts. All cycles start first by running the drain
pump. This removes any water that may be in the sump
after loading the unit. At the completion of this drain cycle
there will be a pause before the unit starts to fill, this unit
pauses after each drain cycle.
The fill cycle starts with the timer activating the water
valve putting water into the unit. A hose from the water
valve carries water to the top of the air gap, which is
mounted to the right side of the tub, from the air gap
The detergent dispenser cover is opened manually by
pressing the spring loaded thumb release located at the
bottom of the cover. After the proper amount of detergent
is added close and lock the cover. Once the cycle reaches
the main wash, the timer applies power to the wax motor
actuator. The plunger of the wax motor extends, pressing
down on a pivot arm attached to the latch for the cover.
This releases the cover to dispense the detergent. At the
same time, on the opposite end of this pivot arm, a pin
rides up in the actuating arm for the rinse aid dispenser.
it exits through a different hose attached to the sump
just below the filter. The total fill time is 30 seconds and
the amount of water entering the tub is approximately 1
gallon. As a point of reference, the water level in the tub
at the conclusion of the fill will be just under the heater.
When the fill is completed the timer again pauses before
the wash motor starts. The timer starts the wash motor
and water is sprayed from both arms simultaneously. The
heater of this dishwasher is used at varying times thought
out the cycle to increase water temperature. If so desired,
a high temperature wash option can be selected. The
high temperature wash option works by pausing the timer
motor to allow the heater to increase water temperature.
There are two pauses in the cycle, the first is after the
detergent dispenser is opened in the main wash cycle and
the second after the rinse aid has been dispensed. These
heat delays pause the timer, by stopping the timer motor,
until the control thermostat senses the proper temperature
then closes which restarts the timer motor and the cycle
continues. This thermostat is mounted to the bottom of the
tub just to the left of the sump. Finally, in the dry portion of
the cycle the heater is cycled on and off to aid in drying.
While in the dry cycle the drain pump will be activated to
remove any remaining water from the tub.
Wash motor
The wash motor and pump are one assembly mounted to
the left of the sump. The motor is a single speed capacitor
start motor, with a clockwise rotation facing the front of
the pump. The pump inlet acts as the front mount for the
assembly. The back is attached to the rear frame with a
mounting bracket and a rubber grommet. Water enters
the front of the wash pump and exits thru two ports.
One supplies water to the lower spray arm. The second
supplies the delivery tube, attached to the rear of the tub,
which supplies water to the center spray arm. The motor
also has an internal thermal auto reset overload for motor
protection.