Whirlpool WGD9500E SERIES, Руководство по обслуживанию

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COMPONENT TESTING
Whirlpool & Maytag 9.2 Cu. Ft. Steam Dryer
n
3-13
For Service Technician Use Only
GAS DRYER ONLY:
1. Verify the gas supply to the dryer is turned on.
2. Unplug dryer or disconnect power.
3. Perform TEST #4c: Thermal Cut-Off on page 3-15. If the
thermal cut-off is OK, go to step 4.
4. Locate the high limit thermostat (see figure 2, page 3-13).
Measure the continuity through it by connecting the
meter probes to the red and black wire terminals.
¾
If there is an open circuit, replace both the high limit
thermostat and the thermal cut-off.
¾
Otherwise, go to step 5.
5. Perform TEST #4d: Gas Valve on page 3-16. If the gas valve
is OK, go to step 6.
6. If the preceding steps did not correct the problem,
suspect the centrifugal switch before replacing the ACU.
7. Reassemble all parts and panels.
8. Plug in dryer or reconnect power.
9. Perform steps under “Service Test Mode”, page 2-5, to
verify repair.
Heat will not shut off:
ALL DRYERS:
1. Unplug dryer or disconnect power.
2. Remove console to access the machine electronics.
3. Remove connector J14 from the ACU and measure the
resistance between J14-3 and J14-6 at the connector.
Refer to “Outlet Thermistor Resistance” table on page
3-14, for temperatures and their associated values.
¾ If the resistance corresponds to the temperature, the
outlet thermistor is good.
¾ If the thermistor resistance does not agree with the
table, replace the outlet thermistor.
4. Check heater coil(s) for a short to ground (usually inside
the heater box). Repair or replace if necessary.
5. Plug in dryer or reconnect power.
6. Run an “AIR” only timed dry cycle (no heat). Check heater
relay output(s) on ACU. Unplug dryer or disconnect
power. With a voltmeter set to AC, connect voltmeter
to terminals 1 & 2 for heater relay #1. Plug in dryer or
reconnect power. Measure the voltage across terminals
1 & 2 for heater relay #1. If equipped, repeat procedure
with heater relay #2.
¾
If voltage is present (~240 VAC for electric, ~120 VAC
for gas), the relay is open and working normally.
¾
If little or no voltage is present, the relay is closed and
heater is activated. Unplug dryer or disconnect power
and replace the ACU.
7. Unplug dryer or disconnect power.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under “Service Test Mode”, page 2-5, to
verify repair.
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
STRIP CIRCUITS
MOTOR CIRCUIT
HEATER (ELECTRIC)
HEATER (GAS)
THERMISTORS (INLET/OUTLET)
MOISTURE SENSORS
WATER VALVE CIRCUIT
L1
BK
J9-1
K1
MOTOR RELAY
ACU
DRIVE MOTOR
1/3 HP
MAIN
START
2.7-3.0
Ω
3.3-3.6
Ω
5M
3M 6M
2M
1M
See Heater Circuit
LBU
BU
N.O.
DOOR
SWITCH
W
N
J9-2
CENTRIFUGAL
SWITCH
LBU
THERMAL
FUSE
LBU
4M
JUMPER
L1
ACU
BK
HEATER RELAY 1
K2
K3
HEATER RELAY 2
N.O.
N.O.
COM1
COM2
BK
V
V
HEATER 1
HEATER 2
19.6
Ω
R R-W
N.C.
HIGH LIMIT
THERMOSTAT
CENTRIFUGAL SWITCH
See
Motor
Circuit
1M
2M
3M
5M
6M
R
L2
THERMAL
CUT-OFF
19.6
Ω
L1
ACU
BK
K2
HEATER RELAY 1
N.O.
50-500
Ω
HIGH LIMIT
THERMOSTAT
CENTRIFUGAL SWITCH
1M
2M
3M
5M
6M
N
COM
R
N.C.
BK
THERMAL
CUT-OFF
R-W
MOV
BK
LBU
FS1
FS2
4 5
1
3
2
1V
IG
IGR
HEATER GAS VALVE
1400 ± 70
Ω
570 ± 28.5
Ω
1300 ± 65
Ω
W
W
W
FLAME
SENSOR
VALVE 1
VALVE 2
IGNITOR
R
R LBU
See
Motor
Circuit
BU
W
DOOR
SWITCH
BU
ACU
J14-2
50K
Ω
R
J14-3
R-W
R
R-W
10K
Ω
INLET TEMP THERMISTOR
OUTLET TEMP THERMISTOR
J14-1
J14-6
INLET THERMISTOR
OUTLET THERMISTOR
ACU
INLET THERMISTOR RTN
OUTLET THERMISTOR RTN
ACU
J13-1
BK
MOISTURE SENSOR
ACU
MOISTURE SENSOR RTN
MOISTURE SENSOR 1
J13-2
J8-2
CHASSIS GND
Y-R
MOV MOV
BK R
G-Y G-Y
G-Y
CHASSIS GND
L1 N
WATER VALVE
J8-1
K4
VALVE RELAY
510-590
Ω
BK R
ACU
J8-3
W
Figure 13 - Strip circuits.
HEATER (ELECTRIC) STRIP CIRCUIT (FIGURE 3)
HEATER (GAS) STRIP CIRCUIT (FIGURE 4)
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
1. Unplug dryer or disconnect power.
2. Slide the top back, remove the front panel,
front bulkhead, and drum to access thermal
components.
3. Check Heaters—on the ACU, use an
ohmmeter to measure the resistance between
the violet wire terminal on heater relay #1
and the violet wire terminal on heater relay #2.
¾ If the resistance is
)
50
1
, go to step 5.
¾
If an open circuit is detected, go to step 4.
Figure 10b - Thermal components,
gas dryer, viewed from front.
Outlet
Thermistor
Thermal Fuse
Gas Dryer
Thermal
Cut-Off
High Limit Thermostat
Flame
Sensor
4. Visually check the wire connections between
each relay and their respective heaters. If the
connections look good, check for continuity
across each heater (violet wire to center red
wire). Refer to strip circuit on page 25.
¾
Replace the heater if it is electrically open.
5. Check Thermal Cut-off—on the ACU, use
an ohmmeter to measure continuity between
J9-2 (L1) and the black wire terminal on heater
relay #1. Then, measure continuity between J9-2
(L1) and the black terminal on heater relay #2.
¾
If there is continuity, go to step 7.
¾ If an open circuit is detected, go to step 6.
6. Visually check the wire connections
between each relay (black wire) and the
thermal cut-off. If the connections look good,
check for continuity across the thermal cut-off.
¾
Replace the thermal cut-off if it is
electrically open.
7. Check High Limit Thermostat—visually
check the wire connections from the heaters
and centrifugal switch to the high limit
thermostat. If the connections look good, check
for continuity across the high limit thermostat.
¾
Replace the high limit thermostat if it is
electrically open.
Figure 10a - Thermal components,
electric dryer, viewed from front.
Inlet Thermistor/High Limit
Thermostat Assembly
Heater
Element
Electric Dryer
Thermal Fuse
Outlet
Thermistor
Thermal
Cut-Off
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
1. Unplug dryer or disconnect power.
2. Slide the top back, remove the front panel,
front bulkhead, and drum to access thermal
components.
3. Check Heaters—on the ACU, use an
ohmmeter to measure the resistance between
the violet wire terminal on heater relay #1
and the violet wire terminal on heater relay #2.
¾
If the resistance is
)
50
1
, go to step 5.
¾ If an open circuit is detected, go to step 4.
Figure 10b - Thermal components,
gas dryer, viewed from front.
Outlet
Thermistor
Thermal Fuse
Gas Dryer
Thermal
Cut-Off
High Limit Thermostat
Flame
Sensor
4. Visually check the wire connections between
each relay and their respective heaters. If the
connections look good, check for continuity
across each heater (violet wire to center red
wire). Refer to strip circuit on page 25.
¾
Replace the heater if it is electrically open.
5. Check Thermal Cut-off—on the ACU, use
an ohmmeter to measure continuity between
J9-2 (L1) and the black wire terminal on heater
relay #1. Then, measure continuity between J9-2
(L1) and the black terminal on heater relay #2.
¾ If there is continuity, go to step 7.
¾ If an open circuit is detected, go to step 6.
6. Visually check the wire connections
between each relay (black wire) and the
thermal cut-off. If the connections look good,
check for continuity across the thermal cut-off.
¾
Replace the thermal cut-off if it is
electrically open.
7. Check High Limit Thermostat—visually
check the wire connections from the heaters
and centrifugal switch to the high limit
thermostat. If the connections look good, check
for continuity across the high limit thermostat.
¾ Replace the high limit thermostat if it is
electrically open.
Figure 10a - Thermal components,
electric dryer, viewed from front.
Inlet Thermistor/High Limit
Thermostat Assembly
Heater
Element
Electric Dryer
Thermal Fuse
Outlet
Thermistor
Thermal
Cut-Off
Figure 1 - Thermal components,
electric dryer, viewed from front.
Figure 2 - Thermal components,
gas dryer, viewed from front.