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Post by turbokinetic on Feb 9, 2021 14:47:42 GMT
Tommy, I am confused, you repaired a broken line going to the evaporator of this unit. I'm confused as to how you pulled a vacuum and added 152a without using the charge port and discovering the so2 in the system. If I overlook that point, you then installed a cap tube and smelled so2 coming out of the closed system after 90 minutes of testing? It must have been a small leak to take that long to be discovered. I believe you have to have a closed system to pull a vacuum, or else you'd be pulling a vacuum on the room, your house, your county, your state... It is a very confusing story indeed. I'm unsure where the idea to use a specific length cap tube on a DR-3 size machine came from since as far as I know, none of us have made nor tested that modification, since there are technical questions which remain unanswered specific to the DR machines. I'm also sorry that the fire incident happened as this is something I worry about myself. In several of my repair videos, I warn about heating a potentially closed system, specifically trapped charge in the low side. It's safest to cut the line before attempting to melt it out. All refrigerants do blend into oil, to some degree. Some combinations are fully miscible, while others are partly soluble in different amounts. Heat and/or vacuum separate the refrigerant from the oil. SO2 is a low enough pressure refrigerant that it takes a lot of time at vacuum, plus some heat, to remove it all from the oil. Refrigerant laden oil can "pop" as the refrigerant flashes out of the oil. That can cause a system to re-pressurize once vented; usually when heat is applied or it is moved around and the oil is agitated. This is something which is a basic concept with most all refrigeration and not specific to Monitor Tops. I completely respect this especially if you don't have access to soldering and charging equipment. It's a good idea. But in my case, I would rather "find" a weak solder connection in my workshop and then repair it; as opposed to having it break later, in someone's house. Remember Paul's DR3 fiasco? We got it working here in AL but the line broke on the highway back to TX? I never advocate abuse of antiques, but had we been a little less gentle, that could have happened here and saved a 1000 mile return trip. |
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Post by tommya11en on Feb 9, 2021 15:09:09 GMT
This happened on a ck machine. My first one. I used the factory crimped line that went from the bulk head to the float chamber cut the crimp out and soldered 1/4" fittings with Schrader valves on each end so I had a high and low port on it. This was before I found a tool for the factory port. I had already cut the valve seat off so the 1/2" tube from the float chamber was open. The circuit was complete when the capillary tube was installed .it had been charged with with 152a before I put the capillary on.
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Post by ChrisJ on Feb 9, 2021 19:44:05 GMT
Any chance R-152 was still trapped on the other side of the float?
R152A is flammable.
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Post by tommya11en on Feb 16, 2021 3:45:23 GMT
I'm sure there was some inside. Believe that's what was burning. I had already cut the needle valve seat off. I should have vacuumed it down and put some nitrogen in it before I started taking the fitting off. Live and learn
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Post by tommya11en on Feb 20, 2021 3:56:57 GMT
hey coldspaces, i was not using the factory connection. i dident have a tool at the time. i cut the factory crimped line that went from the header to the float chamber. when i got it the solder on the line going into the evaporator had broken loose. i cut that line and put fittings on each one to have a high and low port to connect my gauges to. dont know where travis got the idea i was trying to evacuate the earth but maybe i should have been clearer. this machine ran for a year and a half on r-152a with no problem. had i not changed the insulation it probably would have ran for who knows how long.(travis may know). anyway its working great now. i have rounded up 12 more lately so im sure i'll have more tales to tell if they dont kill me first. lol
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Post by Travis on Feb 20, 2021 14:26:35 GMT
Tommy,
I apologize for not understanding. Your lack of sentence structure makes it difficult for me to read and follow your posts.
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Post by tommya11en on Feb 21, 2021 16:31:14 GMT
no problem, i didn't pay enough attention in English class. lol. your right, sometimes im a little hard to follow for someone else but its clear in my mind. i actually build a lot of things from scratch. i've built 2 machines to straighten coiled tubing down in Houston and also two foundations. foundations are to put the spools on. some spools weigh 120,000 pounds. we have ran about 5000 miles in the last 7 years. so sometimes i get like , its clear in my head why not in everyone else's ? ill try to be clearer in future !
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