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Goodman split type system, model MSG12CRN1W Want

Goodman split type system, model MSG12CRN1W Want to know how the refrigerant tubing should be connected, I believe it may have been installed incorrectly

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  • James Haase Oct 01, 2010

    On this mini-split system the smaller line is only 1/4" and the larger is 2/3" and going into the outside unit they are same size and from inside unit the same, I wanted to see a diagram so I can determine which is for which

  • James Haase Oct 05, 2010

    My main concern is that the smaller size(liquid side) is freezing up. I have never seen this but this is the first unit that uses R410a that I have dealt with. Maybe that is normal for that refrigerant just seems odd to me because every unit I have ever come across would have the suction side freeze up if low on refrigerant and the liquid side generally warms up a tad when operating.

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Hi, this is very easy to find out. The out door unit has 2- copper lines coming out of it. A small one on the unit, 3/8" and a large one either a 3/4" or 7/8" depending on the size.2- rolls of copper called the line set are silver brazed into the fittings coming out of the outdoor unit of the same size and uncoiled and ran to the indoor evaporator coil. Again, one is brazed into the smaller open fitting, 3/8" and the other into the larger of the two. There is only one way to install these as the open fittings are made for you to put your lines into at the factory and silver braze them. They could have cut a line and did there own design, but that would be wrong. What kind of problems are you having? I have seen installers add to many joints to connect to and they would be in the way of the panels going on right, but its pretty much cut and dry, a larger suction line at each end, and a smaller liquid/discharge line on both ends. Please let me know the problem?
Sincerely,
Shastalaker7
A/C, & Heating Contractor

Posted on Oct 01, 2010

  • Robert Horton
    Robert Horton Oct 05, 2010

    I have never seen a many split with the same size lines going in? Something new. The 1/4" sounds right, but it would have to be 5/8" or 3/4" not 2/3". There has to be a diagram on the outdoor panel showing where they go. On all a/c I have ever seen, one, the larger is the suction line that the compressor sucks back from, and the smaller is the liquid or discharge line that freon goes the other way. The openings being the same are very unusual indeed.. Call the factor where you bought it, you should have a manual I would think?
    Sincerely,
    Shastalaker7

  • Robert Horton
    Robert Horton Oct 05, 2010

    Hi, I looked up this model unit, only to find that the pipe connections are flared which I knew this, about 1/2 way up the wall along with the condensate line and electrical, and looked up the line sizes and it said that the liquid which is your high pressure side is 1/4 ", always the smaller. The suction line is 1/2" not 2/3". On the outdoor unit, you say the line sizes are the same? It should be stamped High side and low side. High is always smaller and on the left side facing it. Low will always be larger and be on the right side. I hope you have figured this out.
    Sincerely,
    Shastalaker7

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I hope this has helped you out on this. I will be here if you have more questions. Please do not forget to rate me as I know you will be kind. Keep me posted.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contracted

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