Actually, your unit was not designed for continuous draining. It needs water in the tank to help cool the coils. I'm sort of surprised that the unit hasn't stopped cooling or hasn't overheated. Since you haven't seen any water in the drain tank you have, it may have pasted the point of no return. Disconnect the hose, reinstall the drain plug and hope that you have to start emptying the tank again, soon.
Hope this helped you and thanks for choosing FixYa.
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