Wash Circuit - Dexter Laundry WCAD Series Parts And Service Manual

nection of the main control PCB to the LED printed circuit board. Using the factory preset cycle as an
example: The washer fills the tub through the back of the machine with either one or both the C1 cold and
H1 hot water valves. From the P19 connection of main relay PCB, 120VAC is sent out on the white/brown
wire to the C1 cold water fill valve and the red/yellow wire to the H1 hot water fill valve depending on the
temperature selected. After a 90 second delay from the beginning of the wash cycle bath only, the deter-
gent dispenser flushes the detergent into the tub for 20 seconds. This is accomplished when 120VAC trav-
els through the red/orange wire to the H2 hot water valve solenoid. During the machine fill, a 5VDC signal
is sent on the red wire from the P5 connection of the main control PCB to the pressure switch contact and
returns on the yellow and orange wires to the P5 connection of the main control PCB. When the water
level in the basket reaches the preset level pressure, the switch moves the switch contacts to the full or
open position. This causes the main control PCB to signal the relay PCB to shut off the water valve coils.

Wash Circuit

Once the machine has achieved it's water level, the wash basket will continue to tumble one direction for
12 seconds, pause, and then reverse direction for 12 seconds. The time on the front display will count
down as the bath progresses. The time of the bath is programmable up 15 minutes per bath. Note: When
programming cycles, the wash bath must be programmed for 3 minutes or more.
Drain
When the program bath time ends the main control PCB signals the relay PCB to remove 120 VAC power
from brown/yellow wire at P17 going to the drain valve. The normally-open, spring-loaded drain valve
opens allowing water to exit the machine. This resets the pressure switch back to an empty level and
restores the 5VDC connection through the pressure switch from the red wires to the orange and yellow
wires.
Rinse 1 & 2
For Rinse 1 & 2, the rinse LED will illuminate, the drain valve will receive 120VAC and close. The basket will
fill and tumble the same as the wash bath for the programmed time. The rinse water temperatures are
programmable and factory default is cold.
Final Rinse Circuit
The final rinse LED will illuminate, the drain valve will receive 120VAC and close. The basket will fill and
tumble the same as the previous baths for the programmed time. The final rinse water temperatures are
programmable. Note: When programming cycles, the final rinse bath must be programmed and cannot
be set for less than 3 minutes. Also at the beginning of the final rinse bath, the main control PCB will sig-
nal the relay PCB to send 120V to the P-19 connector on the white/blue wire to the C2 cold water valve for
20 seconds to flush the fabric softener dispenser.
Spin Circuit
The spin LED will illuminate and the main control PCB sends a signal to the variable frequency drive via
the data cable at P6 to VFD RJ-11. The rotation as viewed from front during spin will be counter-clockwise.
(The 18lb washers will extract in a clockwise direction) The time of the spin cycle can be programmed.
Note: The final spin must be programmed into the final rinse bath and must be programmed for 1 minute
or more.
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Unlock Thermoactuator and Shake Out Circuit
70 seconds before the end of the cycle the main control PCB signals the relay PCB to remove 120VAC
from the orange/blue wire at the P-17 connector on the lock thermoactuator. This allows the lock thermo-
actuator time to cool and retract by the end of the cycle. To insure that the lock thermoactuator has re-
tracted by the end of the cycle, 1 minute prior the end of the cycle, the unlock thermoactuator is powered
with 120VAC through the orange/red wire from the P-17 connector of relay PCB. The unlock thermoactua-
tor moves the complete bracket assembly away from the door lock solenoid allowing it to drop at the end
of the cycle. The basket will come to a stop from spin speed with the assistance of dynamic braking resis-
tors wired to the variable frequency drive. (See wiring diagrams for quantities and resistor ohm values).
The washer will then tumble for 45 seconds to let the clothes shake loose from the basket and then stop.
End of Cycle and Door Open Circuit
Once the machine stopped, 3 things occur: 1. The beeper will signal for 5 seconds letting the user know
that it is the end of the cycle. 2. The main control PCB signals the relay PCB to remove power from the
white/red wire at P-17 which allows the door lock solenoid to unlock. 3. The main control PCB resets when
the S1,S2,S3,S5 switches open and door is opened. The machine is now ready to accept coins again.
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