We're installing 2 new Trane split heat pumps. Twe090d 7-1/2 and twe120d 10 ton with matching indoor ahu's. I'm reading the install manual and noticed that Trane recommends 5/8 liquid for the 7-1/2 and 1/2" for the 10 ton. I can't see why they'd want a larger liquid line on the smaller capacity unit. Any thoughts??? TIA Fitz

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