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17
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The turbidity sensor measures the amount of suspended
particles in the wash water in the sump. The control sends
the turbidity sensor a pulse width modulated 5 volt signal
for calibration and usage during operation.
Note: If short circuit or open circuit happens to the sensor,
the dishwasher will operate the shortest cycle time, and
may cause the bad wash performance.
By measing the turbidity level, the control module can
conserve energy on lightly soiled loads by skipping
unnecessary cycles.
Turbidity Sensor Circuit
Thermistor
Thermistor is located on the right down side of the sump.
The turbidity
’
s resistance has a negative temperature
coefficient. As the temperature increase, the resistane
goes d
The thermistor
’
s resistance has negative temperature
coefficient. As the temperature increase, the resistance
goes down. At 75℉,the resistance is approximately 11.6k
Ω. At 140℉, the resistance is approximately 2.7kΩ.
Drain System
The drain system cosists of the following components:
z
Auxiliary drain pump
z
sump
z
Check valve(in line with tube)
z
Drain house(includes two drain hose, one with
one-way check valve)
The inlet cover prevents large particles from entering the
sump. Water entering the drain pump is not filtered by the
fine filter(plastic) or by the sump filter(metal & plastic).
The drain pump is mounted on the sump and contains a
one way check valve. The drain pump is controlled by the
control board and can be activated using
Testing Mode.
Auxiliary drain pump stip Circuit
The drain pump utilizes a 120V AC motor. The motor
should read approximately 25Ω
Water Valve and Flood Switch
The water valve is a 120 VAC solenoid valve that is
switched on/off by the control board. The flood switch acts
as a safety switch ONLY and does not control normal
operation of the water valve. The flood switch opens the L
side of the water valve circuit.
+5V
1
2
3
Thermistor