Sensor
The controller has a built-in sensor inside the top of the probe.
Setpoint
The setpoint is set by the potentiometer placed under the cover. An external setpoint device can be connected to the controller. See overleaf.
Setting heating/cooling function
If the external change-over function is not in use, and heating output is desired, a wire must be connected between terminals 7 and 8. If using cooling output, the input is left open.
Indication
AL24A1K has a red LED for output indication. The light intensity varies according to the output voltage level. It has an LED pair for indication of output function. Green LED indicates that the output is set to cooling and the red one indicates that the output is set to heating.
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