AEC AP Series Large Dehumidifying Dryer - Manual (Page 94)

Large Dehumidifying Dryers Troubleshooting 93
6-3 Determining Temperature Controller Errors or Sensor Errors
Using a Thermocouple
If the controller displays a temperature that is close to room temperature (70ºF/21ºC) when
you short-circuit controller input terminals, the controller is normal and the sensor is probably
broken, short-circuited, or incorrectly wired.
Using a Platinum Resistance Thermometer
If the controller displays a temperature of about 0.0°C (32ºF) when you insert a 100-ohm
resistor between terminals A and –B of the controller, and you short-circuit controller
terminals +B and –B, the controller is normal and the sensor is probably broken, short-
circuited, or incorrectly wired.
Other service problems or questions can be answered by contacting the Service
Department.