Hi all

I have some questions regarding the design of the routing in a small split AC system. I can see that there are many different kinds of things you have to consider when designing these systems. One of them is to be sure not to trap the compressor oil in the system, and therefore P trap and base trap risers are used. Is there any particular places these risers are put? Or is it on any vertical pipe line?

Furthermore i see that the horizontal lines need to have a slight downgoing slope, is this for every horizontal pipeline or only in combination with traps?

Thanks in advance
NoJosh