Why would you be trying to disconnect fittings with refrigerant still in the system? You are going to get oil and refrigerant in your face or all over the place. Plus refrigerant can freeze fingers and eyeballs. I don't know how much oil the compressor should have in it. Varies by model. Check Sandens website for a service manual or info on your particular model for quantity. Some oil stays in the evap and condensor all the time. But most of it comes back to the comp when it's running. Most places that sell canned refrigerant usually have cans with the oil already in the can. But it's not a good idea to use that particular can as eventually you could have more oil in the system than it needs. That would reduce the effeciency of the system. If you are concerned about how much oil comes out when you open a fitting, turn the compressor several rotations before cracking the connection to push the oil out towards the condensor. That should minimize the amount. RS
You are confused about refrigerants being flammable. They used to use refrigerants as the propellents in spray cans. That was not flammable as they used R12, the old refrigerant. The new refrigerants are still non-flammable. Now they use propane in spray cans which IS flammable. RS
The oil added to the refridgerant is 1 oz per can (if i recall correctly)... which is the required ratio for most cars. The reason they sell it premixed is so people don't add to much oil or not enough. So I believe your statement about having to much oil this way would be incorrect.
No expert here! I thought most times fron escapes but oil is still in system . . ?? Not sure on this system here if only the compressor is new or what,,, if I spent $$$ on new comp. , I would take to shop so they could vacuum out dirt, mositure, old oil and start out with correct amount of oil and freon. Dryer is needed for warranty I think.
Pulling a vacuum is required regardless to fill an empty system. And replacing the accumulator or dryer is also important, as well as the orfice tube in my opinion.
