AL24A1K is a compact controller for duct-mounting with built-in sensor and one 0...10 V output. It is intended for control of heating or cooling in ventilation and airhandling systems. It can be set to P- or PI-control and has an input for seasonal change-over between heating and cooling.The P-Band is adjustable 0,5...50 K and the Itime can be set by a function switch in 2 or 20 minutes steps.

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.