Sunpentown, Edgestar, Avallon and Koldfront Portable AC units are equipped with an advanced condensation removal system: Self-Evaporating Technology. When running AC mode, this technology recycles the water condensation to cool off the cooling coils, then evaporates the water out with the exhaust air.
This results in increased energy efficiency, cooling performance and reduces the need to empty the water tank. Under extreme humid conditions, the water condensation may collect faster than the unit can recycle. Should the built-in water tank becomes full, the compressor will automatically shut-off and water full indicator will blink. At this time, water should be emptied, which is a simple process.
For units with Self-Evaporating Technology, it is always suggested to not use continuous drainage in cooling mode. Allowing the water to collect and recycle helps cool down the cooling coils, which in turn produce colder air output.
reference:
https://inspectapedia.com/aircond/Portable_Air_Conditioners.php
See: How is Condensate Disposed-of for Portable Room Air Conditioners
https://support.edgestar.com/hc/en-us/articles/200604299-]Do-I-need-to-drain-my-portable-air-conditioner-
See: Do I need to drain my portable air conditioner?