Whirlpool WED99HEDW0 Technical Education page 85

10. Using figure 3 and the strip circuit below, check for the
resistance values of the motor's Main and Start winding
coils as shown in the following table.
NOTE: Main and Start winding coils must be checked at
Contacts
the motor.
1M 2M 3M 5M 6M
Function
Winding Resistance
in ohms
Start
MAIN 3.3–3.6
Run
=
Contacts closed
START 2.7–3.0
Centrifugal Switch (Motor)
¾ If the resistance at the motor is correct, there is an
open circuit between the motor and CCU.
¾ If the Main or Start winding resistance is much greater
or less than the values listed in the table above, replace
the motor.
11. Reassemble all parts and panels.
12. Plug in dryer or reconnect power.
13. Perform steps under "Install Diagnostics", page 5-4, to
verify repair.
Testing the Motor Start & Run Capacitors
1. Discharge the capacitor by touching the leads of a 20,000
Ω resistor to the two terminals.
2. Disconnect the wires from the capacitor terminals.
3. ANALOG METER - Set your meter to ohms (resistance)
function, range to R x 10,000, or the highest scale on the
meter. Touch the meter leads to the capacitor terminals.
The meter should indicate nearly a short circuit initially,
then a steady increase in resistance should be noted.
The needle will move more slowly as it creeps up. If your
capacitor has a resistance of at least 100K (100,000 ohms)
it is good.
If the needle doesn't move when you connect the leads to
the capacitor, the capacitor is open. If the needle indicates
MOTOR STRIP CIRCUIT
MOTOR STRIP CIRCUIT
L1
CYCLE CONTROL UNIT
BK
P9-2
MOTOR RELAY K1
For Service Technician Use Only
Contact Points
of Measurements
Lt. blue wire in back at pin 4
and bare copper wire terminal
removed from pin 5 of black
drive motor switch
Lt. blue wire in back at pin 4
and bare copper wire terminal
on pin 3 of black drive
motor switch
LBU LBU BU
P9-1
4M
THERMAL
PROTECT
Auxiliary
Fan
Pluggable Drive Motor Switch
Light Blue White
Figure 9 - Component locations.
Figure 4 - Pluggable Drive Motor Switch
Pluggable Drive Motor Switch
Centrifugal Switch (Motor)
Function
Start
Run
Figure 5 - Centrifugal Switch Contacts
Centrifugal Switch (Motor)
a short initially and stays there, the capacitor is shorted.
Replace the capacitor.
DIGITAL METER - If you have a digital multi-meter with
an autoranging function, set the meter to the ohms
(resistance) function. Pay attention to the resistance units
displayed on the meter readout. No units = ohms. "K" =
the readout value times 1,000 ohms. "M" = the readout
value times 1,000,000 ohms.
Proceed as described with the analog meter for the test.
What you're looking for is a low initial resistance which
climbs steadily until it exceeds 100,000 ohms. If the value
is below 100,000 ohms (100K) but above 10,000 ohms
(10K), the capacitor is weak and should be replaced.
DO NOT REMOVE OR DESTROY
CENTRIFUGAL SWITCH
DRIVE MOTOR
MAIN
3.3-3.6 Ω RUN CAP
30 uF
2.7-3.0 Ω
START
START CAP
207 uF
HybridCare™ Dryer with Heat Pump Technology
Green-Yellow
GM
Contacts
1M 2M 3M 5M 6M
=
Contacts closed
W
W
LBU
5M 2M
BU
DOOR SWITCH
3M 6M 1M
TESTING
For
N
W
n
6-9