I have a debate that i wonder if any one can solve, if there is a real solution?

System: 2 Bitzer 4j13.2 194800 btu/hr with a 321000btu/hr THR Condensor 12deg TD running at -12C/45C.

From the plant the pipes go up into the roof (2 m) and run in the roof for 20Meters then down past the level of the compressors for a further 2meters ( Condensor 2m below Plant).

The plant has been running fine since 2000 and now there are queries about the position of the condensor.
I have installed certain components and i would like to find out what are the correct components and are risers and pipe size changes or additional components nessesary?

I have a check valve on the outlet of the oil sep and on the outlet of the condensor.

Who knows the answer??