GE DSXH47EG Technical Service Manual

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Contents

GE DSXH47EG Technical Service Manual Manual pdf 18 page image

18The high limit thermostat is a safety device that preventsthe dryer from overheating if the contacts of the RL 2 failclosed. The contacts of the high limit thermostat,normally closed, are set to open at a temperature abovethe preset temperature specifications of the electroniccontrol board. From the output terminal of the high limitthermostat, line 1 is connected to one side of the elementand to pin 3 of the eight pin plug. The other side of theheating element is connected to line 2 through thecontacts of the second centrifugal switch in thedrive motor. This switch prevents power from beingapplied to the element if the motor is not running.The connection to pin 3 allows the control tomonitor the contacts of the high limit thermostatand show an error code if the contacts open abovea preset number of times in a cycle.Drying Time:The amount of drying time is determined in one of twoways. A fixed amount of drying time is determined byturning the SELECTOR knob to one of the fixed dryingtimes. The AUTO DRY cycles a variable amount of timedetermined 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 readsthe capacitance between the two sensor bars locatedin the vent cover.When wet clothes are placed in the dryer, theclothes touch the sensor bars and the moisturelowers the capacitance between the bars. As thedryer runs, moisture is removed from the clothesand the capacitance between the bars increases.When the increase in capacitance satisfies theelectronic control, the cycle status changes from “AutoDry” to “Cool Down” and the load is tumbled without heat.At the end of cycle, the electronic control will turn thedryer off and the end-of-cycle signal sounds.Electrical Operation (Gas Dryer Models)Note: Always refer to the wiring diagram orschematic with the product.When the dryer is connected to electrical power, line 1is connected to pin (1) of the eight pin plug of the controlboard, the terminal marked COM on the door switch andthe COM terminal of the heater relay that is mounted onthe electronic control board. Pin 1 of the eight pin plugprovides power to the electronic control board. Theelectronic control board controls the operatingtemperature of the dryer and length of the cycle by eithersensing the amount of moisture in the clothes or cyclesfor 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 theeight pin plug and neutral is connected on pin 2 of thesix pin plug. The control board receives inputs fromthe membrane switches, which program the control, thecontact sensors that sense the amount of moisture inthe clothes and the control thermistor which sensesthe temperature in the dryer. The control board usesthese inputs to control the drive motor circuit by openingand closing the contacts of relay RL 1 and the heatercircuit by opening and closing the contacts of relay RL2.Drive Motor Circuit:When power is connected to the dryer, line 1 is appliedto the COM terminal of the door switch. When the dooris closed the COM terminal is connected to terminal NOof the door switch. From terminal NO, power is appliedto terminal J4-2 of the control board and to the motorSample wiring diagram.