There is an engineering report somewhere on the web of an R22 HVAC compressor unit exploding because the service tech failed to evacuate it properly before charging with refrigerant. R22 has a range of combustability and this guy found it.
The tech was hospitalized after being retrieved from low earth orbit. The site photographs show the effects of a large fireball but little that would be recognized as the remains of a condensing unit.
The HC vs HFC argument will go on ad infinitum like arguments about rifle calibers, brands of boot grease, and of course politics and religion. The important thing is to learn the subject (including the rules) before hacking potentially dangerous equipment. I did it so it can't be that hard.
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