GE DSXH47EG, Technical Service Manual, Page: 18 / 47

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The high limit thermostat is a safety device that prevents
the dryer from overheating if the contacts of the RL 2 fail
closed. The contacts of the high limit thermostat,
normally closed, are set to open at a temperature above
the preset temperature specifications of the electronic
control board. From the output terminal of the high limit
thermostat, line 1 is connected to one side of the element
and to pin 3 of the eight pin plug. The other side of the
heating element is connected to line 2 through the
contacts of the second centrifugal switch in the
drive motor. This switch prevents power from being
applied to the element if the motor is not running.
The connection to pin 3 allows the control to
monitor the contacts of the high limit thermostat
and show an error code if the contacts open above
a preset number of times in a cycle.
Drying Time:
The amount of drying time is determined in one of two
ways. A fixed amount of drying time is determined by
turning the SELECTOR knob to one of the fixed drying
times. The AUTO DRY cycles a variable amount of time
determined by the size of the load, the amount of mois-
ture in the clothes, and the dryness setting selected.
In the AUTO DRY cycles, the electronic control reads
the capacitance between the two sensor bars located
in the vent cover.
When wet clothes are placed in the dryer, the
clothes touch the sensor bars and the moisture
lowers the capacitance between the bars. As the
dryer runs, moisture is removed from the clothes
and the capacitance between the bars increases.
When the increase in capacitance satisfies the
electronic control, the cycle status changes from “Auto
Dry” to “Cool Down” and the load is tumbled without heat.
At the end of cycle, the electronic control will turn the
dryer off and the end-of-cycle signal sounds.
Electrical Operation (Gas Dryer Models)
Note: Always refer to the wiring diagram or
schematic with the product.
When the dryer is connected to electrical power, line 1
is connected to pin (1) of the eight pin plug of the control
board, the terminal marked COM on the door switch and
the COM terminal of the heater relay that is mounted on
the electronic control board. Pin 1 of the eight pin plug
provides power to the electronic control board. The
electronic control board controls the operating
temperature of the dryer and length of the cycle by either
sensing the amount of moisture in the clothes or cycles
for a fixed amount of time when time dry is used.
Electronic Control Board Circuits:
Line 1 is applied to the control board at pin 1 of the
eight pin plug and neutral is connected on pin 2 of the
six pin plug. The control board receives inputs from
the membrane switches, which program the control, the
contact sensors that sense the amount of moisture in
the clothes and the control thermistor which senses
the temperature in the dryer. The control board uses
these inputs to control the drive motor circuit by opening
and closing the contacts of relay RL 1 and the heater
circuit by opening and closing the contacts of relay RL
2.
Drive Motor Circuit:
When power is connected to the dryer, line 1 is applied
to the COM terminal of the door switch. When the door
is closed the COM terminal is connected to terminal NO
of the door switch. From terminal NO, power is applied
to terminal J4-2 of the control board and to the motor
Sample wiring diagram.