Installing a built-in dishwasher involves preparing the cabinet space, connecting the water supply, hooking up the drain line, wiring the electrical lines, securing the dishwasher in place and testing for leaks. Replacing an existing dishwasher is usually easier because the fittings are in place already.
For the water supply, a professional turns off the water, disconnects the hot water supply and installs a dual outlet valve on the intake. Then he reattaches the hot water to the other end of the valve. Using copper tubing and plumber's tape, he connects the dual outlet valve to the dishwasher. Some models have the connection point at the back of the dishwasher, while others have a front control panel.
The worker attaches the dishwasher drain line to the drain pipe under the sink. If this is a new installation, the sink's drain pipe needs replaced with a dishwasher tailpiece that has the proper fitting. The worker secures the drain line to the top of the cabinet in back of the dishwasher to prevent water back up.
He turn the power off and connects the three wires. The black is the hot wire, the white is the neutral wire, and the green is the ground wire. The first two are connected to the electrical box using electrical wire nuts. The ground wire attaches to the ground screw on the box.
The dishwasher is placed in the cabinet, leveled and secured. The worker turns the power and water back on and runs it through a cycle to test for leaks.