Marc, from what little I know/have seen on the web about A/C rotary compressors, they probably cope with any gas refrigerant - it’s just that the R407c is possibly the one the compressor was type tested with. Car A/C units seem to use one of 2 types of gas & it may depend on what was current when the car was manufactured?
As far as I can make out, the (normally) gas comes in via the side unit which contains a particle filter & the ability to retain/boil off any liquid coolant which happens to make it from the condensing (cooling) coils.
The pump data sheet does mention oil, but I expect that is in there to lubricate/cool the pump mechanics.
The exhaust (pressure side) seems to be the top tube which normally goes off to the evaporator coil (an external unit with fans) to get rid of the heat extracted by the cooling coils + pump compression heat.
- Typical A/C arrangement
Your pump is pretty powerful compared to a normal piston type fridge compressor, so able to shift a lot of gas/air. You might need to be able to start the pump & let it get to speed before trying to put on load. You can do this by opening a pump relief valve for a short time each time the pump starts, letting it get up to speed.
Even more important to use reservoir tanks with this pump methinks.
Peter