GE Profile DPVH890EJ Technical Service Manual page 23

Electric Dryer Element Operation - Normal Heat Cycle
• To measure electric heater amperage, locate and read current on the orange wire connecting the inlet
safety thermostat to MT1 on the triac.
• To measure triac gate voltage (VDC), read between J4 Pin 3 (logic ground) and board location JT27.
Amperage Reading Location
1. The K8 relay closes J10 Pin 1 to J10 Pin 5. This energizes the inner element. At the same time, the triac
is gated with 4.8 VDC. MT1 to MT2 close, turning on the outer element. At this time, both elements are
energized and the heat system is drawing approximately 24 amps.
2. As the drum temperature begins to rise, the triac gate voltage begins to pulsate between 4.8 and 0 VDC.
The current draw of the outer element begins to drop. The heat system is now drawing somewhere
between 16 and 20 amps.
L1
OUTLET
CONTROL
BACKUP
RED ORANGE
3. Triac gate voltage fi nally drops to 0 VDC. The outer element is off. The inner element is still operating. The
system is now drawing approximately 12 amps.
L1
OUTLET
CONTROL
BACKUP
RED ORANGE
WHITE
INLET
SAFETY
ORANGE
BLUE
ORANGE
WHITE
INLET
SAFETY
ORANGE
BLUE
ORANGE
– 23 –
J4 Pin 3
INNER ELEMENT
NC 19.2 OHMS
WHITE
STEAM PURPLE
INTERLOCK
NC
BLUE
OUTER ELEMENT
19.2 OHMS
INNER ELEMENT
NC
19.2 OHMS
WHITE
STEAM
PURPLE
INTERLOCK
NC
BLUE
OUTER ELEMENT
19.2 OHMS
JT27
L2
DRUM
MOTOR
M1-M2
BLACK
L2
DRUM
MOTOR
M1-M2
BLACK
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