I recently had my split system AC unit replaced. I purchased and set the equipment myself and hired an AC technician to do the rest. In reading the instructions for the condensing unit, it calls for an inverted loop in the compressor suction line when the evaporator coil is above the condenser, which mine is. The installer did not do this, and I'm wondering how important it might be. I checked with the company that sold me the equipment and asked them if this would void my warranty. The said no, but I didn't feel that the person who told me really knew.
Thank you for your comments.