sung
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Posts: 5 
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Post by sung on Oct 26, 2015 7:16:24 GMT
Its compressor is shorted to ground. And I am trying to figure out a proper replacement. The original compressor is rated 1/8hp, 110vac/60hz, full load amp 2.2 - 4.0.
It originally contains sulfur dioxide. I plan to use r134a compressor from Tecumseh. I may need high torque compressor because the flattop uses flooded low side float system, which I understand it is always under load from reading. Has anyone done this before? I like get some feedbacks before I commit to what compressor I go with.
Also, the condenser fan motor is seems to be bad. I can't remember the exact number but start winding(white) was about 50 ohms and run(red) winding was about 500 ohms.
Normally, I would automatically assume it is bad. But, it seems odd to have two problems at same time. Perhaps the short from compressor damaged the fan motor. I bought this unit from craigslist knowing that it would not run. I would appreciate any inputs. I plan to fix it and use for myself in my shop. Thanks. Sung from Portland, OR
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Post by coldspaces on Oct 26, 2015 13:44:54 GMT
From what we have learned the problem with putting a modern compressor on these flooded systems is they have very little oil in them. Your old compressor may have 1 1/2 quarts of oil in it. The new one will be more like 10-12 oz. This is not enough reserve to be sure the oil will always start to return from the evaporator before the crankcase is low on oil. We have a thread this was discussed in before, I will try to find it for you later today if I can.
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sung
New Member
Posts: 5
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Post by sung on Oct 26, 2015 15:20:09 GMT
OK. Thanks
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Post by cablehack on Oct 26, 2015 22:04:33 GMT
Shorted to ground in what way? An isolating transformer could be a way out of the problem if the winding insulation has failed at only one point.
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Post by coldspaces on Oct 27, 2015 0:54:02 GMT
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sung
New Member
Posts: 5
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Post by sung on Oct 27, 2015 5:09:01 GMT
"Shorted to ground in what way? An isolating transformer could be a way out of the problem if the winding insulation has failed at only one point."
Both start and run winding had off resistances. And measured about 50k to metal part of the compressor. Currently, I already have removed
the original compressor and sealed the two copper tubes that lead to evaporator.
So far from reading past threads, I need to be mindful of type and amount of oil and charge about 90% of original 2 pounds sulfur dioxide.
I am not sure how I can make sure enough oil returns to compressor other than hoping it will. I also understand that antique appliance companies tried this and
compressors had very short life. Nothing is seems to be easy. I am going to take my time and try anyway.
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Post by cablehack on Oct 27, 2015 7:33:55 GMT
50K is far from a short to ground. Only 2.4mA would flow at 120V. It would have been possible to ground the compressor and use it.
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Post by stlvortac on Oct 29, 2015 1:11:32 GMT
Fan may give you strange readings, two phase motor, one side powered by the start winding of the compressor. It won't be compatible unless the new compressor has similar start winding voltage.
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Post by stlvortac on Oct 29, 2015 1:13:56 GMT
I'm willing to pay shipping before you pitch the fan and relay. Assuming the relay is ok?
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sung
New Member
Posts: 5
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Post by sung on Oct 29, 2015 3:57:15 GMT
no, relay is fried.
Is it easier if retrofit the flattop with r12(r12 compressor and hotshot)? And add some mineral oil? Thanks
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Post by coldspaces on Oct 29, 2015 3:57:46 GMT
I you were close I know of a flat top that you might buy cheap and take the compressor out of it. Not sure but I think it is a static cooled condenser.
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sung
New Member
Posts: 5
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Post by sung on Nov 2, 2015 17:14:19 GMT
Coldspaces, I think you are right about finding another similar compressor for my GE. It might take a while but I think I am going to look for another compressor locally. Mine is really a good looking fridge. Thanks for all inputs. I learned a lot about retrofitting.
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Post by stlvortac on Nov 3, 2015 1:11:32 GMT
I came across pics of a flat top that had the compressor replaced with a FEA unit. They were the replacement refrigeration units for defective monitor tops. That would give you another alternative if one comes up on CL, ebay etc.
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