I am an HVAC guy slowly crossing over into refrigeration as called. I live in a small town in Middle Tn. and some of the locals don't want to call the big city refrigeration companies. I really want to learn the refrigeration side of this business, and this site has helped me greatly.
I was asked the other day by a local store owner to give him a price on replacing a compressor on a reach-in cooler. The cooler used R-12. He already has a replacement compressor. I have worked with R-12 once in an industrial setting working on a cascade system when I first got started in this business, (I did not work for myself back then). But we had enough R-12 on site to do the job.
My question is: What replacement refrigerant should I use for this reach-in and will I need to flush the old oil out of system?