TRAINING MANUAL WM0742HGA
WM0742HGA Page 45 TRAINING MANUAL
Sensor Wiring Diagram Steam Generator
The Steam Generator is made up of 5 major components. They are the 1,100 watt
heater @ 120 V
AC
, the low water sensor, the high water sensor, the temperature sensing
thermistor, and the water tank.
The water level sensors, the thermistor, along with the control board determine IF the
steam generator heater will be activated. To the left and above you will see the wiring
diagram for the water level sensors. The picture above shows 3 connectors. The rear
connector with black and white leads is the temperature sensing thermistor. The center
connector with a pink and white wire is the low water sensor. The front connector with a
single violet lead is the high water sensor.
From the wiring diagram you will see that the white wire (NA) is the GND reference. The
Pink wire is the low water sensor lead. The violet lead is the high water sensor lead.
Low Water Sensor Sensing Water
The sensors operate in a 5 V
DC
environment. When water is present and
conductivity exists from the white GND
lead and the pink low water sense lead, less
than 1.5 V
DC
will be measured.
If the water tank were empty, the low water
reading from WH to PK would be greater
than 3 V
DC.
(See High Water Sensor, Next page.)
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