Got a warranty call from a national food processor. Their 2 door upright refrigerator located in the quality control laboratory not cooling. Unit was diagnosed with a plugged cap tube. The factory sent out a new compressor,cap tube, and drier. The tech installed everything and Weighed in the R290 refrigerant. Now 2 Months later the factory discovers that they sent out the wrong compressor. Now here’s my question. How could this work correctly for two months. This is in a lab and they record temperatures every hour. They have record sheet taped to the door. And are using external medical thermometers.Talked to the Tech and he says the process tubes suction, hot gas were exactly the same as the original compressor. So he didn’t think anything was wrong. The factory is sending out correct parts for us to redo.
Ooopps, Installed 134A compressor on a R290 system
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tarzanseal
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Got a warranty call from a national food processor. Their 2 door upright refrigerator located in the quality control laboratory not cooling. Unit was diagnosed with a plugged cap tube. The factory sent out a new compressor,cap tube, and drier. The tech installed everything and Weighed in the R290 refrigerant. Now 2 Months later the factory discovers that they sent out the wrong compressor. Now here’s my question. How could this work correctly for two months. This is in a lab and they record temperatures every hour. They have record sheet taped to the door. And are using external medical thermometers.Talked to the Tech and he says the process tubes suction, hot gas were exactly the same as the original compressor. So he didn’t think anything was wrong. The factory is sending out correct parts for us to redo.
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Or that!
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interesting
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Can you do this without changing the cap tube? I feel a minority in a group of R290 haters. My experience has shown me that 290 is the best operating refrigerant I have ever worked with, if someone burns themselves or has a hazard working with it, they are careless. No good excuse for that.
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I haven't tried it with R290 yet but have used R134a on R12 cap tubes and never had a problem.
Since R290 is close in operating pressures as R134a I would assume the same results.
I'll take that back now that I actually looked at the comparison R290 does run at a higher pressure for the same give temperature as R134a
Have a look at 90°f liquid temperature.
Since R290 is close in operating pressures as R134a I would assume the same results.
I'll take that back now that I actually looked at the comparison R290 does run at a higher pressure for the same give temperature as R134a
Have a look at 90°f liquid temperature.
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I don't think that is correct, keep in mind also that the propane molecule is substantially smaller, thereby the efficient operating characteristics. From my PT chart pressure relationships put 290 closer to 404A. Some of the older R12 units which have had compressor changes to POE oil compressors, at that point 134A is a drop in. As for deliberately "going backwards", I don't think that is ever a good idea.
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I read somewhere R22 drops in ... but I havent tried it
Will that work?
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I've read of people using 404 or 22 with success.
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Give the op a couple days and maybe he'll let us know.
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134 will Not work ....
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It will with a R134a compressor which is what the OP said was mistakenly installed.
However tweaking the cap tube is the question.
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