would this work?

[BradC]

Originally Posted by nexsuperne

The 1 ton ac unit I have is filled with r407c. Can I put r290 in it?

R407C is a blend of three HFC refrigerants designed to give it properties similar to R22. Given it's HFC the oil is likely to be POE.

HC's will work with POE oil, however it is mightily hygroscopic, so you *will* need to install a liquid line drier after you've finished messing with the system.

R290 will have lower pressures overall, so you might need to tweak some stuff.



<edit> Huh, lost the legends
Pressure in PSI, Temperature in C. Orange line is R407C, Blue line is R290