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Post by allan on Apr 4, 2022 18:10:19 GMT
Any ideas on what this blue stuff may be. Perfectly operating CA1 with cap tube conversion. Attachments:
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Post by turbokinetic on Apr 4, 2022 20:12:01 GMT
Any ideas on what this blue stuff may be. Perfectly operating CA1 with cap tube conversion. Can you show a picture? Copper compounds are often blue or green. It is likely some sort of corrosion. As to what caused it; that is hard to say. On CK and other SO2 machines, the SO2 can seep and leave green corroded areas. On yours, without SO2, it is harder to say. |
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Post by turbokinetic on Apr 5, 2022 1:51:17 GMT
Hi Allan. That blue-green coating is a form of copper corrosion. It is possible that there was solder flux left on the lines after the unit was modified with the cap tube. I would wipe it off with a rag and water, and see if it comes back. I am not sure if methyl formate causes corrosion like this. I do know that SO2 does cause this sort of corrosion.
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Post by cablehack on Apr 5, 2022 7:05:15 GMT
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Post by turbokinetic on Apr 5, 2022 12:43:22 GMT
Boy; I bet that led to some blockages! |
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Post by cablehack on Apr 5, 2022 22:47:03 GMT
Boy; I bet that led to some blockages! It sure did! It’s why that fridge ended up with a cap tube with filter, and a replacement evaporator. I’m pleased to say when I opened it up later it was all perfectly clean. Moral of the story is don’t leave the system open to the atmosphere for several years. |
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Post by turbokinetic on Apr 6, 2022 2:08:59 GMT
Boy; I bet that led to some blockages! It sure did! It’s why that fridge ended up with a cap tube with filter, and a replacement evaporator. I’m pleased to say when I opened it up later it was all perfectly clean. Moral of the story is don’t leave the system open to the atmosphere for several years. Definitely don't leave systems open for years! I have had to fight through several systems which had been abused in this manner. Always a challenge! |
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Post by don on Apr 6, 2022 18:22:30 GMT
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Post by ChrisJ on Apr 28, 2022 17:32:17 GMT
If memory serves, that's just a strainer. But I also believe Allan uses spray foam on his jobs. |
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Post by ChrisJ on Apr 28, 2022 17:33:46 GMT
I would ask why there's no corrosion on the bare copper tubing but it is on the equalizer.
And why is the center of the equalizer all boogered up? I don't think any of mine look like that.
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Post by don on Apr 30, 2022 16:48:23 GMT
I would ask why there's no corrosion on the bare copper tubing but it is on the equalizer. And why is the center of the equalizer all boogered up? I don't think any of mine look like that.
It appears that there might have been a coupling inserted and brazed in the middle of the equalizer line or possibly a clamp on piercing valve was used there in some point of its history. The access valve might have been removed and the puncture hole brazed over.
I would suggest that the equalizer line was always covered with moisture/frost as both ends are brazed into the stainless evaporator. I believe moisture and acid vapor react together to accelerate corrosion. |
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Post by turbokinetic on May 2, 2022 12:41:38 GMT
I would ask why there's no corrosion on the bare copper tubing but it is on the equalizer. And why is the center of the equalizer all boogered up? I don't think any of mine look like that.
It appears that there might have been a coupling inserted and brazed in the middle of the equalizer line or possibly a clamp on piercing valve was used there in some point of its history. The access valve might have been removed and the puncture hole brazed over.
I would suggest that the equalizer line was always covered with moisture/frost as both ends are brazed into the stainless evaporator. I believe moisture and acid vapor react together to accelerate corrosion.You're right! There is a coupling there which isn't from the factory. I bet they used flux and didn't clean the job up afterwards, leaving the flux residue in place to corrode everything. |
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