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Post by turbokinetic on Aug 27, 2020 2:43:31 GMT
Wow, that is a tiny pinhole. I hope you're right that it is a punched hole and can be repaired easily; but it sure looks like it is a corrosion defect in the metal. Best I can tell so far is not a punched hole. Its so small I will fix it and hope its the only one it ever has. That's all a man can do, in the absence of happening to have a spare evaporator sitting around!
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Post by coldspaces on Sept 6, 2020 17:56:29 GMT
So I made the last of the SO2 disappear from this refrigerating machine. I then cleaned the leak area and tried to use Stay Brite solder, it should work on stainless steel but didn't want too flow out. I cleaned things again and used the 45% silver braze and paste flux. Flowed out real nice. I then tipple evacuated it and next let it sit all night in a vacuum to liberate as much so2 as possible. I then ran the pump again before charging with 2.25 lbs of R-124. By the way this was all done with the unit upside down to keep the float open and using only the connection on the float. Here is a video of it running. Ignore the fact I call it r-124A once by mistake lol youtu.be/nxM8Q_Fy75o
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Post by turbokinetic on Sept 7, 2020 0:53:24 GMT
So I made the last of the SO2 disappear from this refrigerating machine. I then cleaned the leak area and tried to use Stay Brite solder, it should work on stainless steel but didn't want too flow out. I cleaned things again and used the 45% silver braze and paste flux. Flowed out real nice. I then tipple evacuated it and next let it sit all night in a vacuum to liberate as much so2 as possible. I then ran the pump again before charging with 2.25 lbs of R-124. By the way this was all done with the unit upside down to keep the float open and using only the connection on the float. Here is a video of it running. Ignore the fact I call it r-124A once by mistake lol youtu.be/nxM8Q_Fy75oThat repair looks good! It's interesting that the StayBrite wouldn't flow. Makes me wonder again; if something strange was going on, metallurgically, at that one point in the evaporator. The braze repair you ended up with seems to cover a generous area. It's covering enough area that even if the original point was due to a metallurgical defect, I would expect the repair goes well beyond the boundary of the defect. It's interesting about the difference in boiling sound in the evaporator. I have a "theory" about this. I think that when you have boiling in a low viscosity refrigerant, there is a similar sound to water boiling which we are all familiar with. But once oil is blended with the refrigerant, you would have more of a foamy boiling effect, and less sound emission. I've done some Westinghouse repairs going from R12 (fully miscible) to R152A (not miscible) and noticed the R152A was louder in the evaporator. So basically, went the opposite way as you did on this CK, and got the exact opposite result. Maybe an analogy would be having a pot of water boiling and it's loud and rough; but mix some sugar in the water and it goes from loud and rough to smooth and foamy boiling?
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