I am installing three Carrier 24ABS condensing units in a hotel. This is a new installation. I think that I need to either increase the suction line size or put traps in it to ensure oil return to the compressor. The condensers are on the roof about 22 feet above the air handlers. I can't find any guidelines for this in the installation manual nor on Carrier's website. Any suggestions? The systems are 3 ton, 2.5 ton and 1.5 ton. The linesets will have about 30 feet of horizontal run.