Maytag MED5800TW Technical Education - Page 62

High-limit Thermostat &amp, Thermal Cutoff Tco, Gas Models Only, Thermal Fuse & Exhaust,

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WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. THERMAL FUSE & EXHAUST THERMISTOR HIGH-LIMIT THERMOSTAT & THERMAL CUTOFF (TCO) (GAS MODELS ONLY) Thermal Fuse Exhaust Thermistor High-Limit Thermostat Refer to page 4-12 for the procedure for accessing the thermal fuse & exhaust thermistor. 1. Unplug dryer or disconnect power. 2. Turn off gas supply to dryer. 3. Disconnect the wires or connector from the component under test. 4. Set the ohmmeter to the R x 1 scale. 5. Touch the ohmmeter test leads to the thermal fuse terminals. The meter should indicate a closed circuit (0 Ω). NOTE: The thermal fuse opens at 196°F (91°C). 6. Set the ohmmeter to the R x 100K scale. 7. Touch the ohmmeter test leads to the exhaust thermistor terminals. The meter should indicate as shown in the following chart. EXHAUST THERMISTOR RESISTANCE TEMP. RES. TEMP. RES. °F (°C) kΩ °F (°C) kΩ 50° (10°) 19.0 - 22.0 80° (27°) 8.5 - 10.5 60° (16°) 14.8 - 16.8 90° (32°) 6.8 - 8.8 70° (21°) 11.5 - 13.5 100° (38°) 5.0 - 7.0 Thermal Cutoff Refer to page 4-13 for the procedure for accessing the high-limit thermostat and thermal cutoff (TCO). 1. Unplug dryer or disconnect power. 2. Turn off gas supply to dryer. 3. Disconnect the wire connectors from the high-limit thermostat or thermal cutoff terminals. 4. Set the ohmmeter to the R x 1 scale. 5. Touch the ohmmeter test leads to the high-limit thermostat or the thermal cutoff (TCO) terminals. The meter should indicate a closed circuit (0 Ω) for both components. 5-2

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5-2
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
WARNING
HIGH-LIMIT THERMOSTAT &
THERMAL CUTOFF (TCO)
(GAS MODELS ONLY)
Refer to page 4-13 for the procedure for ac-
cessing the high-limit thermostat and thermal
cutoff (TCO).
1.
Unplug dryer or disconnect power.
2.
Turn off gas supply to dryer.
3.
Disconnect the wire connectors from the
high-limit thermostat or thermal cutoff ter-
minals.
4.
Set the ohmmeter to the R x 1 scale.
5.
Touch the ohmmeter test leads to the
high-limit thermostat or the thermal cutoff
(TCO) terminals. The meter should indi-
cate a closed circuit (0
Ω
) for both com-
ponents.
Thermal
Cutoff
High-Limit
Thermostat
THERMAL FUSE & EXHAUST
THERMISTOR
Refer to page 4-12 for the procedure for access-
ing the thermal fuse & exhaust thermistor.
1.
Unplug dryer or disconnect power.
2.
Turn off gas supply to dryer.
3.
Disconnect the wires or connector from
the component under test.
4.
Set the ohmmeter to the R x 1 scale.
5.
Touch the ohmmeter test leads to the
thermal fuse terminals. The meter should
indicate a closed circuit (0 Ω).
NOTE:
The
thermal fuse opens at 196
°
F (91
°
C).
6.
Set the ohmmeter to the R x 100K scale.
7.
Touch the ohmmeter test leads to the
exhaust thermistor terminals. The meter
should indicate as shown in the following
chart.
Thermal Fuse
Exhaust Thermistor
EXHAUST THERMISTOR RESISTANCE
TEMP.
°F (°C)
TEMP.
°F (°C)
RES.
kΩ
RES.
kΩ
50° (10°)
19.0 – 22.0
80° (27°)
8.5 – 10.5
60° (16°)
14.8 – 16.8
90° (32°)
6.8 – 8.8
70° (21°)
11.5 – 13.5
100° (38°)
5.0 – 7.0