Inlet Control Thermistor; Inlet Safety Thermostat - GE Profile PTDS650EM Technical Service Manual

Inlet Safety Thermostat

On electric models, the inlet safety thermostat is
located on the top left area of the heater housing,
to the left of the inlet control thermistor. On gas
models, the inlet safety thermostat is located on
the right side of the diffuser, above the inlet control
thermistor. The thermostat monitors incoming air
temperature.
If the thermostat reaches a temperature beyond its
maximum temperature rating, it will trip and disable
power to the heating elements (electric models) or
burner assembly (gas models).
On electric dryers, the inlet safety thermostat opens
at 210°F (99°C) and will automatically reset at 180°F
(82°C). On gas dryers, the inlet safety thermostat
opens at 300°F (149°C) and will automatically reset
at 260°F (127°C).
To remove the inlet safety thermostat:
1. Remove the top panel, front panel, and drum.
(See
Top Panel, Front Panel, and Drum
2. Disconnect the 2 wires from the inlet safety
thermostat.
3. Remove the Phillips-head screw that attaches
the inlet safety thermostat to the heater
assembly or diffuser.
4. Lift and slide the thermostat from the heater
assembly or diffuser.
Electric Model Shown

Inlet Control Thermistor

On electric models, the inlet control thermistor is
located on the top left area of the heater housing,
to the right of the inlet safety thermostat. On gas
models, the inlet control thermistor is located on
the right side of the diffuser, below the inlet safety
thermostat. The thermistor monitors incoming
air temperature and will respond to temperature
changes of 3 °F. The thermistor relays this
information to the control board.
The thermistor has a negative coefficient. As the
temperature increases, the thermistor's resistance
decreases.
Temperature
.)
Inlet Safety
Thermostat
– 35 –
Thermistor Resistance Values
Temperature
°C °F
10 50
16 60
21 70
25 77
32 90
38 100
49 120
57 135
66 150
93 200
121 250
(Continued Next Page)
Resistance
K-Ohms
202
151
120
100
74
57
37
27
19
8
3