

Fun fact older refrigerants also broke down into phosgene under high temps. The old school way to identify a compressor burn out was to take a whiff of the refrigerant. If your sinuses started burning from the phosgene then that means you need to do a burn out cleanup.
Newer refrigerants are much more safe, they just break down into hydrogen floride which turns into hydroflouric acid on contact with water. Nothing leaves you quite as invigorated as hydroflouric acid suddenly forming in your lungs, sinuses, throat, and eyes.









Normally phosgene isn’t quite that deadly. If you catch it full concentration then you’re in for a bad time as your lungs start blistering but that definitely isn’t something that happens from a small leak unless its also in a confined space. I’ve gotten a face full of phosgene a few times on the job and you definitely notice it. Idk what it smells like because to me it just smells like pain. It feels like you just took a huff off a bottle of drain cleaner. If you get hit with enough of it, it’ll leave you short of breath and your chest burning but the only time I ever got hit with that much was the time I took a plasma cutter to an old refrigerant can I had forgotten to purge with nitrogen first while working in a closed garrage.
Suffice it to say, you would definitely know it if you got exposed to any significant amount of phosgene.