The condenser is 15 metres below the compressor?

[ArtMal2009]

Will I find technical documentations about making the cooling installation where, where the condenser is 15 metres below the compressor?
How to make the return of oil on the liquid?
What are there problems with the return of oil?

[Brian_UK]

Whereabouts is the evaporator?

[ArtMal2009]

The evaporator is 1 the metre over the compressor - precise air conditioner.

[Gary]

Oil won't be a problem as the liquid will carry it easily.

The problem would be needing to raise the high side pressure in order to lift the liquid back up to the evaporator.

This would be a good system to add a liquid pump.