'74 Columbia 45 Reefer info

Hi y’all, I am looking for information about the factory installed refrigeration system on a '74 Columbia 45 motorsailor. Specifically any specifications, what type of refrigerant used? What brand / model is the compressor / condensing unit? What is the rated system capacity? etc… If anyone can help me out or steer me in the right direction where I might be able to acquire said information I would appreciate it immensely. Thanx in advance and Happy Sailing to All

Sounds like you need a refrigeration specialist to have a look. Refrigerant from 1974 (freon?) is probably not permitted or available. Newer refrigerants may or may not be compatible with your setup because of piping or seal materials. The specialist may be able to help you out with what you have and get it to work. He may also suggest replacing the entire mess with a more efficient modern unit that might cost less to run and end up saving you money.