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What would cause a high subcool(35f)...and the Evap coil to freeze...this is a 5 ton split system r22 with txv....1 " 1/8 suction line.....5/8" iquid line.....line set over 120 feet.....condenser on roof air handler in basement....compressor amps below nameplate running at 12amps rated for 16 amps....another company was there two weeks ago....and I see a brand new head pressure control so the system had to be opened....non-condensables?...thank you Paul S