Here you can see the clear connections for the two copper lines which transfer the moisture and refrigerant back and forth between the compressor, condenser, or air ventilator unit/s. These are extremely important to the air cooling and heating process as they are the reason why your able to attain a lower or higher output temperature. The copper can not be bent in any 90 degree angle , if you accidently bend it to a 90 degree extreme, you risk breaking the piping in any of the internal copper areas and creating a leak which will normally break your complete HVAC system within several days. A special tool is needed when making certain bends in the copper and it is best to ask any expert "where" bends should and should not be made. Depending on where you have laid your copper, will tell the expert where you should make additional bends. Keep in mind if you take matters into your own hands and create your own bends where you believe they should be, you risk having to replace a complete copper line-set which could easily cost anywhere from $150 - $400 depending on the girth and length.
