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The steamer does have to have a small amount of water going into the drain box to cool the steam and protect your drain system. But if you are getting a excess of water, perhaps your on-off valve handle has wear and not fully closing the drain line. Or your water solenoid is leaking. There is a spray nozzle at the top of the drain box that controls the cooling flow.
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The manufacturer intentionally has a water flow when the supply valve is turned on so that there is a cool down period after cooking. If you wanted to design and install a automatic system, it would require delay timers and interlocks to the steamer control system.