Have unfinished 3 ton system ( contractor ran away). furnace and cooling coil installed with ductwork tied in . refrigerant lines tied in as well. no condencer yet , no gas line and no control wires. My suction line is 3/4 (refrigeration) and liquid is 3/8. Lines about 45-50 ft long and 20 ft. high split between AH and CU (CU below). System is Rheem and according to their specs suction should be 7/8. But customer do not want to go through trouble opening walls and pay extra for repiping it( I guees he got ripped on that one). He wants to go with cheapest condencer what will match install ( probably not Rheem.
Question is if I should be worried too much about slightly undersized suction line.