What are the most important things I need to know before installing my Della Mini Split AC?

According to the manual, there are 5 critical things to know: the installation location is critical, handle the refrigerant pipes perfectly, bundle the line set correctly, vacuum pump the refrigerant circuit properly, and ensure safe electrical connection (Page 3). Most problems emerge from incorrect or poor installation, so professional HVAC installation is strongly recommended and comes with extended warranty benefits.