GE Profile PTDS650EM Technical Service Manual

Also see for Profile PTDS650EM: Dimensions and installation information

– 35 –Inlet Safety ThermostatOn electric models, the inlet safety thermostat islocated on the top left area of the heater housing,to the left of the inlet control thermistor. On gasmodels, the inlet safety thermostat is located onthe right side of the diffuser, above the inlet controlthermistor. The thermostat monitors incoming airtemperature.If the thermostat reaches a temperature beyond itsmaximum temperature rating, it will trip and disablepower to the heating elements (electric models) orburner assembly (gas models).On electric dryers, the inlet safety thermostat opensat 210°F (99°C) and will automatically reset at 180°F(82°C). On gas dryers, the inlet safety thermostatopens at 300°F (149°C) and will automatically resetat 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 safetythermostat.3. Remove the Phillips-head screw that attachesthe inlet safety thermostat to the heaterassembly or diffuser.4. Lift and slide the thermostat from the heaterassembly or diffuser.Inlet Control ThermistorOn electric models, the inlet control thermistor islocated on the top left area of the heater housing,to the right of the inlet safety thermostat. On gasmodels, the inlet control thermistor is located onthe right side of the diffuser, below the inlet safetythermostat. The thermistor monitors incomingair temperature and will respond to temperaturechanges of 3 °F. The thermistor relays thisinformation to the control board.The thermistor has a negative coefficient. As thetemperature increases, the thermistor's resistancedecreases.Electric Model ShownInlet SafetyThermostatThermistor Resistance ValuesTemperature°CTemperature°FResistanceK-Ohms10 50 20216 60 15121 70 12025 77 10032 90 7438 100 5749 120 3757 135 2766 150 1993 200 8121 250 3(Continued Next Page)