I am installing a walk in freezer 19,000 BTUS at -10 suction line is 10 feet long with 4 90s + a p-trap line has a 5 ft. vertical rise included in the 10 feet. I was going to use 1 1/8 suction line but now I'm afraid this might be to large. The installation book has 1 1/8 line listed as the maximum suction line size for riser at -10°
18,000 BTUS,Also should the size of pipe be reduced in the riser? Thanks for any help!