The ECO function is a low-speed fan function, where two DOs are used. This can only be achieved when using Application 9 in which it is possible to define an extra “Fan 2” output to trigger low speed of the EC fan motors. “Fan” will start the fan(s) at high speed and “Fan 2” will reduce the speed. When fans are running ECO/Low speed the display will show “ECO”.
ECO can also be activated during night operation, where the ECO function is used when night curtains are closed on the case. Please be aware, however, that ECO is not possible if the heating or defrost function is active (if the controller has been set up for this).
If the controller is set up with two-step EC fans, “ECO” will show in the display at low speed where both DO outputs are active.
Configuration:
Configuration of relay output DO2 (e.g. Single Coil, application 9): 0=not used, 1=fan, 2=fan Eco, 3=defrost, 4=rail heat, 5=alarm, 6=light, 7=night blinds, 8=compressor, 9=compressor 2, 10=heating element
Please note: Adaptive defrost cannot be used with two-step fan control.