Hello there I have a unit to install the run is about ten feet long from evaporator to condenser how can I size the pipe

The size of the pipe you use is determined by the size of the fitting opening that is on the unit. Almost all residential unites have a 3/8 OD copper tubing for the High pressure side, the suction side is according to the tonnage of the unit.
If this does not answer your question then let me know.

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Originally Posted by bobinn

hello there i have a unit to install the run is about ten feet long from evaporator to condenser how can i size the pipe

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Continue with the same size piping that comes out of the condenser and take it up to the evaporator.