Haha, it's interesting to read everyone's posts. In fact, r 12 can completely replace 600A. But the opposite is impossible! When replacing, you should master the medium, and it is best to cool the compressor. Because the cylinder diameter of 600A compressor is reduced, the refrigeration capacity will be discounted. It is best to use 600A a. In fact, 134A can be replaced by 12 complete leaves. Generally speaking, friends who are not familiar with using 134A can try it. I want to make more friends in the refrigeration maintenance industry. QQ 1306082 103