GE DPGT750EC/GC Technical Service Manual

GE DPGT750EC/GC Technical Service Manual Manual pdf 27 page image

– 27 –Blower MotorThe blower motor is a DC, variable speed motorcapable of operating at different speeds inresponse to changing air temperature and ventingimpedances. Below 1000 rpm, the dryer controlturns the heater off.Resistance of the motor windings can bemeasured at the 10-pin connector on the inverterboard or at the motor. (See Inverter and MainBoard Pin Connectors).The blower motor has an approximate resistancevalue of 14 Ω between the following wires:• Yellow to Yellow• Red to Red• Blue to BlueThe remaining wires are a ground and feedbackthrough the control for determining motor speed.To remove the blower motor:The blower housing must be removed to accessthe blower motor.1. Disconnect power to the unit.2. Remove the Top Cover, Front Panel, and Drum.3. Disconnect the outlet thermistor and outletthermostat wiring located on the back side ofthe blower housing.4. Disconnect the motor wiring.5. Remove the spring straps. Remove the drivemotor from its cradle.Drive MotorThe drive-motor is a single-speed AC, 1 /3 -hpmotor with an automatic reset overload protector.• The overload protector is an internalcomponent of the motor and cannot bereplaced separately.• The motor contains a centrifugal switch thatserves three purposes:1. Disengages the motor start winding.2. Engages the motor run winding.3. Closes the circuit contacts for the heatsource.• The switch is an internal component of themotor and cannot be replaced separately.The drive motor has an approximate resistancevalue of:• 3 Ω between the blue and white wires• 7 Ω between the brown and blue wires.• 10 Ω between the brown and white wires.To remove the drive motor:1. Disconnect power to the unit.2. Remove the Top Cover, Front Panel, and Drum.3. Disconnect the motor wiring.4. With a flat blade screwdriver, compress theopen end of the spring strap (one strap oneach end of the drive motor) until it releases.Motor WiringOutlet Thermostat WiringOutlet Thermistor Wiring(Continued next page)DisconnectSpring Strap