Dishwasher installation isn’t difficult for a do-it-yourselfer, but it does require a little plumbing knowledge and might involve some electrical work (hooking up the power cord). If you have a dishwasher installed but don’t know how to hook up its water and drain lines or you want to install a new dishwasher in a different location, you can do this DIY project. First, shut off the electricity and water supply (at the breaker or valve under your sink), then remove your old dishwasher. To disconnect the existing water supply line, you’ll need to take apart the nut or screw on the nipple that locks it in place, which usually involves turning the nipple counterclockwise with a wrench. A good idea is to have a bowl or bucket handy to catch the excess water that will drip out during this process. Once the supply tube and nipple are free, you can install a new dual-outlet shutoff valve to serve your new dishwasher.
If you have a new dishwasher, carefully lay it on its back to make the electrical and plumbing connections easier to access. Remove the front access panel and, if your dishwasher has tray sensors or a drip tray, remove those as well. Then, if the dishwasher has rear legs, adjust them to raise it up and position it at counter height. You’ll also need to route the drain hose and power cord behind the dishwasher, so you’ll need to open the back cabinet door to access the area behind the sink.
Before you begin, lay a sheet of cardboard or an old blanket on the floor to protect it from scratches while you’re working underneath the dishwasher. You’ll probably need to put it on its back again when you’re ready to put it in place and secure it to the brackets that fasten it to the countertop.
The water supply line connects to the dishwasher using an adapter elbow that you should apply plumber’s tape to for a tight seal. It’s best to use a stainless steel, braided water line rather than a cheaper plastic one to prevent leaks and increase durability. If you don’t already have a water supply line that fits your dishwasher, purchase a hose that is marked for dishwasher use and screw it on the adapter elbow. You’ll also need to purchase a new gasket and compression fitting for the water hose, which you can find at most home improvement stores.
The power cord connection is made in a junction box at the back of the dishwasher, behind the kickplate or a removable panel. If your dishwasher doesn’t have a power cord, you’ll need to purchase an appliance cable and an extension cord of the right gauge. Then, remove the cover from the wire connection housing and connect the three exposed wires inside: green to green grounding screw, white to white dishwasher lead, and black to the black lead on your dishwasher. Replace the cover and connect the power cord to the outlet, securing it with a twist-on wire connector (wire nut). You’ll also need to attach the drain hose to the sink tail pipe or garbage disposal drain, and follow the manufacturer’s instructions for routing and positioning.
source https://flowlinkplumbing.wordpress.com/2023/10/20/dishwasher-installation-for-the-do-it-yourselfer/
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