Page 66 AD Series Dehumidifying Dryers
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 AEC Service Department.