GE DSXH47EG Technical Service Manual

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Contents

GE DSXH47EG Technical Service Manual Manual pdf 19 page image

19relay RL 1 on the control board. When the control boardcloses relay RL 1, power is applied through terminal J4-1 to terminal M4 of the drive motor.Terminal M4 is connected inside the motor to one sideof the thermal overload. (The thermal overload protectsthe motor from being damaged by overheating.) Theother side of the thermal overload is connected to oneend of both the run winding and the start winding of thedrive motor. When the motor is not turning, the otherend of the start winding is connected internally toterminal M5 of the motor through the NC contact of themotor centrifugal switch. The other end of the runwinding is also connected internally to terminal M5which is connected to neutral.When the motor is not turning, the start winding andthe run winding are connected in parallel. When thecontacts of relay RL 1 are closed, with the dryer doorclosed, line 1 and neutral voltage are applied across boththe start and run windings of the drive motor. With powerapplied to both the start and run windings, the motorstarts to turn.When the speed of the motor reaches about 80% ofit’s normal run speed, the contacts of the centrifugalswitch remove power from the start winding, thus remov-ing the start winding from the circuit.The drive motor preforms two tasks in the dryer. A pulleyattached to one end of the motor shaft uses a belt todrive the dryer drum. The blower wheel is attached to theother end of the motor shaft to pull the air through theclothes and force it out the exhaust vent.Temperature Sensing Circuit:The temperature in the dryer is controlled by the controlthermistor and the electronic control board. The controlthermistor, mounted in the blower fan housing, is anegative coefficient thermistor that decreases inresistance as the temperature increases.The electronic control board reads the resistance of thethermistor and converts it into temperature. The electroniccontrol compares the reading from the thermistor to thetemperature setting for the cycle and cycles the heatingcircuit accordingly.The Heating Circuit:The electronic control board applies power to theheating circuit through the contacts of relay RL 2. Whenthe electronic control senses that the temperature inthe drum is below the programmed temperature, itcloses the contact of heater relay RL 2 applying line 1to the high limit thermostat. The high limit thermostatis a safety device that prevents the dryer fromoverheating if the contacts of the relay RL 2 fail closed.The contacts of the high limit thermostat are normallyclosed and are set to open at a temperature above thepreset temperature specifications of the electroniccontrol board. From the output terminal of the high limitthermostat, line 1 is connected to pin 3 of the eight pinplug, one side of the holding coil of the gas valve, thesecondary coil of the gas valve, and the sensor that ismounted on the burner chamber.The connection to pin 3 allows the control to monitorthe contacts of the high limit thermostat and show anerror code contacts open above a preset number oftimes in a cycle.The holding coil, secondary coil, booster coil, sensor,and igniter circuits interact with one another to assuresafe operation of the dryer gas burner.The gas valve has two chambers in series, bothmust be opened before gas will flow into the burner.The solenoid that controls the gas flow through thefirst chamber has two coils, the booster coil and theholding coil. The solenoid that controls the secondchamber has one coil, the secondary coil.BoosterHoldingSecondary