1. Connect the adjustable regulated DC power supply to AC power:

a. Set the current knob to the high current position

b. Adjust the output voltage to the actual voltage value of the tested water pump

2. Place an inlet pump (submersible pump) in the sink (box) and slowly add clean tap water to the sink until it exceeds the height of the water pump inlet by more than 20CM

3. Insert the plastic hose into the water pump outlet and fix it straight with the horizontal plane

4. Connect the water pump switch in series to the red wire and press the red and black power cords with clamps separately on the positive and negative poles of the regulated power supply (the positive and negative poles of the power cord must not be reversed)

5. Turn the water pump switch to the power off state, and then connect the red and black power lines with clamps to the red (positive) and black (negative) wires of the water pump power line separately

6. Check the above installation work and make sure it is correct