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Re: prongs on dryer
Take old cord off. Remove wire or ground strap connecting dyer frame to center (nutral) terminal. White wire goes to center terminal. Green wire to frame (ground) Red and Black wires go to two remaining terminal, order really won't matter.
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Ok, so you currently have a three prong cord on your dryer? Your house has a 4 prong receptacle? Ok so now you've purchased a 4 prong dryer pigtail? Be sure cord is unplugged. Remove cover of junction in back of dryer. You will see three terminals. They should be labeled something like L1,L2,N . ON one terminal you well see a small ground strip This is currently connecting the neutral terminal to ground. On the new cord connect the outside two conductors to L1 +L2 connect the white conductor to the N terminal. Connect the green (ground) conductor to the frame where the copper bonding was. This seperates the neutral conductor from the equipement grounding conductor.
To switch from a 4 prong to a 3 prong. First remove 4 prong cord, save screws you will need them. Look a 3 prong, it will be flat with 3 wires next to each other with metal fittings on the ends. The 2 outside which are hot wires go to the outside screws on the block, and the center which is neutral goes in the center. The only difference in the cords is the 4 prong has a ground, in new construction this is code. You don't need a ground if house is wired for a 3 prong.
if its a" flat cord" what-ever color jacketed 3 wire cord, the 2 outside wires are your 2 hot power wires they go to L1 and L2 on your dryer,the center is the N neutral wire and goes to the N terminal,usually the L1 and L2 are a gauge larger than the neutral: HINT: the center is normally neutral on both the cord and machines terminal board in the back of the dryer,there usually is a diagram on the dryer on how to install the input power at the place you hook up power
Your four prong cord has 4 wires. Black,Red,Green and White. Remove the 3 prong cord from the dryer. The Black and Red wires go to the outside terminals on the dryer. The White wire goes top the center terminal. The Green wire goes outside the terminal cover to any nearby screw for grounding.
Dryers come with a wire or metal strap connecting the center "neutral" terminal to the frame of the dryer. When using a four wire power cord, take that wire or strap off the frame. (it can be discarded or better yet, in case this dryer needs to ever be converted back to a three wire cord) connect the frame end of the wire / strap to the center terminal of the power block. Now, Green (ground) wire goes to the dryer frame, White (neutral) goes to the center terminal, and the Red and Black (both "hot") wires go to either outside terminal. (one to each)