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Old 10-11-2019, 08:48 PM
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Yes it's normal for the 3155 to pump water upon power-up.
You can adjust the voltage output to the pump. While unplugged, remove the 4 phillips screws on the back. Inside there is a micro pot. Twist the knob all the way counter-clockwise to drop the output to it's lowest setting. This will reduce the water output per cycle to 'around' a cup give or take.
You'll find it will also reduce pump noise.
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