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Post by slatefolkhouse on Apr 14, 2023 13:32:17 GMT
Hi there, I've been working on trying to restore a beautiful PJB7-A flat top GE machine from 1941, since last summer. I keep getting close to getting it working but then something stumps me. I am attaching some images of the fridge above and going through the manual I had found for the scotch yolk machines. Looking for some ideas here as it was helpful before.. I bought the fridge from craigslist in good condition but the electrical cord was so damaged we tried to put in a new electrical cord, when doing this the wiring was incorrect and fried the relay. _ _ _ coldspaces helped me out by rebuilding my relay. I've also had a new thermostat put in as initially thought it was the thermostat. The issue now is that the relay works but the compressor won't stay on. It clicks on for one minute but then kicks right back off. I'm wondering if the compressor needs to be replaced as well. I called Antique Appliances to ask for advice and they said that most of the compressors from 1941 were the R-12 kind. Is that correct? Does anyone have a suggestion where I could find one? Does anyone have any suggestions if the compressor won't stay on? Much appreciated!
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Post by ckfan on Apr 14, 2023 15:30:53 GMT
It sounds like something still isn’t right either in the relay or the wiring. It sounds like the compressor is tripping off on the overload in the relay. Have you measured the current draw of the compressor? If it is drawing more than say, 4 amps, something is wrong and will need further troubleshooting.
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Post by turbokinetic on Apr 14, 2023 20:32:59 GMT
Hi there, and welcome to the forum!
I see one major issue which would keep the compressor from working correctly. The relay must be upright and mounted correctly. If it is laying sideways, gravity will cause it to malfunction and keep the start winding engaged. That will result in an overload trip after 30 seconds or so. This is harmful to the compressor, so yo need to be sure not to let it run like this.
To proceed with more troubleshooting, as Ray said above you'll need to know the current demand. The easiest way is a plug-in power meter such as a P3 Kill-A-Watt meter. These use 3 amps or less under normal conditions so you can get an idea of whether or not it is disengaging the start winding.
Sincerely, David
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Post by slatefolkhouse on Apr 15, 2023 15:45:11 GMT
I think you are both right! The repair guy that we had to come and wire it didn't mount the relay to the side of the compressor! We tried re-wiring it again and it worked. I'm impressed, thank you so much for helping me diagnose the problem and save this fridge.
Thanks again to Gill who rebuilt the relay for us as well. Fingers crossed it keeps working !
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Post by turbokinetic on Apr 15, 2023 17:31:39 GMT
I think you are both right! The repair guy that we had to come and wire it didn't mount the relay to the side of the compressor! We tried re-wiring it again and it worked. I'm impressed, thank you so much for helping me diagnose the problem and save this fridge. Thanks again to Gill who rebuilt the relay for us as well. Fingers crossed it keeps working ! So glad to help! happy it was a simple problem for you.
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