The lines in your sketch are backwards. As a general rule, the liquid line should be smaller than the suction line. In your sketch, the borehole loop is part of the suction line. It would be better to use 5/16" from the cap tube to the compressor muffler and 1/4" everywhere else, if you even need it. The only tubing I have used over 1/4" in my beasts has been used to adapt up in size to fit compressors and txv fittings. The situation changes rapidly with long distances and larger capacity systems.
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