Originally posted by eric1:


incidentally i struck up a conversation with a guy getting some ac stuff in the store and he said R12, the real freyon ,the type of stuff used in refrigerators ,can get much colder than r134a ...



Not true. My company (CArrier A/C) has replaced r-12 with r-134 in our industrial units. They do the same temperatures. I just left a job here we make -20F Brine.

Freon is a Brand name (DuPont's) for r-12
Allied Signal R-12 : Genetron
Carrier: Carrene 12

R-134a is SUVA (DuPont)

Refrigerators don't usually use r-12, they use r-22 which is now replaced with r-134a or other refrigerants (r-410, others).

Most window units in your home are r-22.

The guy getting A/C stuff must have limited experience.

Now, if he said that an R-12 car system that is converted to r-134a isn't as cold, he would be right. R-12 is slightl;y denser than r-134a so the orifice sizes, amount of refrigerant needed and some other little details make a conversion job inefficient. For instance, the compressor needs to run a little faster for r-134a than r-12. In new cars, pulley sizes are changed. In retrofits, it isn't changed (usually) and the system can not cool well at engine idle.

FYI for everyone.






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