They're both POE oil. Probably the same for all intents and purposes. I guess that H means high solubility.

http://www.nucalgon.com/assets/prodlit/3-68.pdf

 

In my uneducated looking, it seems that 3MAF seems to be mainly a Copeland specification... but what the actual difference is.....

Being they produce both, I would assume they are not supposed to be interchangeable....

 

Just a guess, but I'll bet the compressor wouldn't care if those oils were mixed. Call Calgon in the morning and ask them. There's an 800 phone number in that link I posted.

 

Thanks! I looked quick and totally overlooked the link.

At the bottom of the page, it does say H is for High Solubility and 3MAF is Copeland formulation.