Although most of installation is difficult to do, installing a dishwasher is a DIY project. It is not that difficult and it can save you an installation fee too. However, some things you have to prepare before install it in your kitchen.
Preparations for Dishwasher Installation
You have to make sure the machine will fit in the opening for the first step. For opening, the most standard dishwashers are 24”. It is important to consider the width of the dishwasher at the time, if you are installing new cabinets.
You need to check that most machines are adjustable within certain limits. The check step is needed to make sure that the dishwasher you plan will fit the opening. You need to check it before you buy it. You need to drill one or more holes to run supply lines. Whole saws make quick work of drilling larger diameter holes.
The next step is Remove the faceplate at the base of the machine to access the supply line inlet and electrical box. Connect the wiring, drain, and supply lines before pushing the dishwasher into the cabinet; since it makes it easier to access, the underside of the machine might be a good idea.
Connecting the Drainpipe
The first thing to consider is connecting the drainpipe to the discharge pump. Many local building codes require dishwashers to be vented using an air gap to prevent the siphoning of water from the sink drain or disposal. Stand the air gap in one of the sinkholes or drill a hole for it in the countertop. Connect the drainpipes to the air gap and secure them with hose or spring clamps.
If an air gap is not required, loop the drain hose up near the top of the base cabinet, and attach it to the wall with a strap to prevent backflow from the sink. Run the drainpipe to the inlet of the garbage disposal and secure it with a clamp. You have to remove the garbage first because it disposals have a plug in the inlet. Replace the drainpipe under the sink with a dishwasher branch tailpiece and install it above the trap under the sink if there is no garbage in the dishwasher.
Connecting the Supply Lines
The diameter of most dishwasher supply lines are 3/8”. However, you need to check it to make sure you have the right parts before you start the job. You can start the work by turning off the water and installing a dual outlet shut-off valve to connect the dishwasher supply line to the hot water pipe under the sink. Hot water for the sink faucet is provided by one valve while the other attaches to the dishwasher supply line.
This will allow you to turn the water off to the dishwasher separately from the faucet. Connect one end of the supply line to the shut- off valve and the other end to the water inlet on the underside of the dishwasher using a right angle elbow. If you need other than it, apply Teflon tape to the male threads to prevent leaks. Supply lines should be hand tightened then given a solid quarter turn with a wrench.
Connecting the Electrical Supply
You have to make sure that you always cut off the power to the dishwasher by flipping the circuit breaker before attempting to connect the electrical supply. Run the cable through the back of the electrical box on the dishwasher, and connect the hot, which is usually black, and neutral, which usually white, wires to the corresponding wires in the box using wire nuts. Be sure to connect the ground wire to the green screw and replace the cover on the box.
Turn the water back on and check for leaks, then turn on the power and run the dishwasher through a full cycle. If everything works properly, slide the machine into the cabinet, being careful not to crimp or pinch the pipes. Plumb and level it by raising and lowering the adjustable feet on either side.
Screw the dishwasher to the underside of the countertop to hold it in place. When attaching the mounting screws to the plywood used to support a stone countertop, be sure the screws do not protrude into the stone. Attach the faceplate to the base, and your new dishwasher is ready to go!