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Section 3 Electronic Control And Testing
3-8
Temperature Sensing in the Control System
The control system has two sensors, a thermistor located
in the machine compartment to the left of the sump, and
the rinse aid sensor mounted on the right side of the
dispenser. These two sensors are in the 12VDC control
system and receive power from the transformer.
(See Figure 3-11)
The thermistor is used by the control to read water
temperature so the control can adjust cycle time. The
thermistor can be checked for resistance, which is best
done at room temperature and should read 10K ohms.
This reading will decrease as the thermistor temperature
increases. The thermistor can be checked at the
electronic control. Remove power to the dishwasher
and remove the P-3 connector from the control. Check
resistance at the two blue wires at P-3 #9 and P-3 #10,
if a faulty reading is indicated, the thermistor can be
checked at the disconnect plug next to the sump.
(See Figure 3-12)
The rinse aid sensor is used by the control to inform
the customer when the rinse aid dispenser needs to be
refilled. This sensor is located on the right side of the
detergent dispenser and is connected with two black
wires. The sensor will read 0 ohms resistance when the
rinse aid is low or empty, and when the dispenser is full,
the sensor will not have an ohms reading. Before
checking this sensor, remove one of the wires, then
make your checks.
High Temp
Thermostat
Thermistor
Mount that
attaches to
side of sump
Figure 3-11.
Thermistor
Disconnect
Plug
Figure 3-12.
Detergent and Rinse Aid Dispenser
The detergent and rinse aid dispensers are combined
into one housing that are controlled with a common wax
motor actuator. (See Figure 3-13) The first time the
control energizes the actuator, the cover over the
detergent side of dispenser opens, dispensing detergent
for the main wash cycle. The second time the actuator
is energized, rinse aid is released in the final rinse cycle.
The detergent side of the dispenser has two cups for
detergent under the one cover. The larger of the two
cups is for the detergent needed in the main wash.
The smaller is for detergent used in the pre-wash, which
falls into the tub from slots in the cup cover when the
dishwasher door is closed.
The rinse aid section has both a clear indicator to show
the amount of agent in the dispenser and a reed switch,
mounted to the side of the dispenser, that is monitored
by the control to inform the user if the agent is low.
There is also an adjustable hub inside this dispenser,
visible by removing the cap, to adjust the amount of
rinse aid dispensed in the cycle. The adjustment is
made by turning the hub to a higher or lower number,
the higher the number the more agent that is dispensed.
The detergent and rinse aid dispenser is replaced as a
complete assembly.
Wax Motor
Linkage From Wax Motor
To Rinse Aid Dispenser
Reed Switch Sensor
Connections
Figure 3-13.
Содержание FDB2410HIB - Full Console Dishwasher
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Страница 24: ...Section 2 Installation Information 2 14 Notes ...
Страница 48: ...Section 4 Component Teardown 4 14 Notes ...
Страница 52: ...Section 6 Wiring Diagrams 6 2 Notes ...