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I BOUGHT A.C LG AS-H366NMM2 34000 BTU WITH 3/4 inch gas pipe but at my house thre is 5/8 inch pipe gas please advice me if it is necessery to change the pipe gas at my house to 3/4 inch

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  • emmanuel10 Apr 18, 2009

    It seems my question was not understood:my line is smaller (5/8) than the air conditioner unit line (3/4), hence, my line is not larger than the one that is being called to use- it is the contrary. So, is t possible to install it this way; if yes, isn't it going to be more noisy that it should be orgoing to cause some problems?

  • emmanuel10 Apr 18, 2009

    Thanks a lot for your quick and professional answer. It answers the issue and I am now able to handle the installation with my technician.


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No, you are fine as long as your line is larger than what it is being called to use.

Posted on Apr 18, 2009

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  • Donni Steen Apr 18, 2009

    It depends on what type of copper you are referring to. Are you using refrigerant copper, otherwise known as annealed copper? Or are you referring to nominal copper? Ok, then to answer your question if your inside diameter is smaller than the inside diameter of what it is being called to use, then you MUST replace it. Refrigerant copper is sized using outside diameter. 7/8 inch annealed tubing is considered 3/4" nominal and so on.

  • Donni Steen Apr 18, 2009

    I forgot to add this to the post. The unit will not be more noisey. The less effort on the part of the compressor to pull the refrigerant to the condenser will make it use less energy. When the refrigerant lines are too small for it, it starves the condenser unit, and the coil causing the compressor to work harder and pull higher amps. It is fine to use larger piping but you can not use smaller without having some issues that later can void a warranty because the proper copper sizing wasn't used.

  • Donni Steen Apr 18, 2009

    Your welcome! Have a great weekend and hope the install goes well!


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