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LWD3081ST LG Double Oven Wiring for Display


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5 replies to this topic

#1 Muddbucket

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Posted 22 July 2011 - 01:37 PM

So I got a brand spankin new LG LWD3081ST double wall oven into the store here to go on display. We've modified the cabinets in our kitchen showroom to support and hold this beast.

With most other appliances for display purposes I can wire them using cheater cords to run the control panel safely but not this guy.

I took a junction box and a 25 AMP fuse and wired the Green, White, and Black wires with merrets leaving the red alone and capped by itself
Usually this works for almost any appliance but not for this beast. I've seen it running on 120v at tradeshows so I know it can be done the question is how?

I've talked to my rep and he's said he'll talk to his tech guys but won't be able to get back to me til Tuesday, the wall oven weighing in at 325lbs is to be installed today and I really, really don't wanna yank it out again.

If anyone has any ideas let me know.

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#2 Muddbucket

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Posted 22 July 2011 - 01:52 PM

Looks like the wiring I was trying isn't going to work. The red/blk/wht wiring comes into the machine and goes to some lug posts, from there its distributed where it needs to go.

Theres a red/wht connection on the PCB. White is coming from a big transformer by the lugs and red is coming up from inside the machine, going to trace that and find where it goes.
The control board then has a wht/blk going from the PCB to a 120v transformer, then from the transformer to the PCB again with 2x Yellow, 2x Red

I assume the red/white supplies power to that blk/white connection on the board that powers that transformer which powers the rr/yy wires.

Going to try to supply power to red/white and see how it goes I guess.

#3 Muddbucket

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Posted 22 July 2011 - 02:04 PM

Okay so after pulling the wiring diagram (Which I then carefully folded and put back) the red lug from the 220v supplies power to the thermostat which then runs to the PCB to supply it with power.

So heres the question.

In my cheater cord junction box I have wht/grn/blk

I assume my wiring will be like this

Junction Box --- > Oven
White -> White
Blk -> Red
Green -> Green

Confirm?

#4 Muddbucket

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Posted 22 July 2011 - 02:43 PM

Worked, oven is functional more or less, display is working. Sorry to bother.



#5 KurtiusInterupptus

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Posted 22 July 2011 - 05:05 PM

Sometimes it helps to write it out..nice job. You didn't really need us :D
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#6 RegUS_PatOff

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Posted 22 July 2011 - 05:29 PM

yes, usually if 220v appliances are (correctly) connected to 120v, the heating elements won't be powered.
white to white
and
black to either black or red (try either)
and of course green to green (chassis)
Dryers
Ranges
Ovens
etc...
.

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