The non-pro dry cab need you to adjust the power knob by trial and error until it stabilize on your desire %RH.
Different dry cab may have different setting. My setting for knob is around 9o'clock. The RED LED is turn on, and the GREEN LED is dimmed. From environment humidity (~80%RH), it take around 1-2 days to stabilize. Check, if your knob fully turn to left, the GREEN LED will off. Fully turn to right, the GREEN LED will on. Set GREEN LED to dimmed.
Regards,
Arto.
As also quoted in another thread. My AD-60 do not any green LED, only RED. When i turn the knob to H region, LED will turn off, other than that, it's red LED, even at the L region to the extreme. Either side within the M zone, dunno y my RH keeps dropping to below 40%.