6
OPERATION
WASH SYSTEM
Once filling is complete, the dishwasher enters the pre-wash phase. The pre-
wash phase conditions the soil with water and detergent to prepare it for removal in
the main wash phase.
Once water enters the tub, the pump draws the
water into the sump through a primary filter at the
bottom of the tub to prevent food from circulating
through the wash system and redepositing on the
dishes. In the center of the primary filter is the
lower spray arm and drain filter assembly. The
drain cap, snapped into the drain cup, prevents
food particles from entering the drain section of the
sump.
As the wash water flows through the filters, soil
levels and water temperatures (see Soil Sensing
section, this page) are measured by the Soil
Sensor / Thermistor assembly. The wash motor
discharges the wash water through two ports,
feeding the lower, center, and upper spray arms.
The larger of the ports feeds water through a “Y”
hose to separate the lower and center spray arm wash water. The water flowing to
the center spray arm first passes through an inline water heater before entering the
delivery tube. The water flowing to the lower spray arm passes through the sump
on its way to the lower spray arm.
SOIL SENSING
Soil sensing is performed in all wash cycles except the Rinse only cycle.
Mounted on the right side of the sump, the soil sensor transmits light from a
transmitter to a receiver to measure the amount of soil in the water. This
information will be used by the control to determine the length of the cycle.
Once pre-wash loosens food on the dishes, the motor stops for 30 seconds.
This allows the wash water and food soils to settle for the soil sensor to
check the soil levels in the water.
Now that this reading is taken, the dishwasher drains the dirty water and fills
again for the pre-wash rinse. Once this rinse is complete, the wash motor
pauses again, a soil level measurement is again taken. The control uses
these readings to adjust the wash cycle to ensure a clean load of dishes.
Figure 2
“Y” hose
Sump
Inline Heater
Wash
motor
Figure 3
Thermistor
Soil
Sensor
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