When the compressor is working for the first time, it usually takes a longer time to low down the air temperature, the evaporator is not as cold as other times, that is why the below digital temperature controller offers this “editable fan delay time for the 1st Time of the controller Boot” option beside the “editable fan delay time” which is for the remaining time.

The fan time delay relay is the same one, but the initial point of timing is different.

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