- Location
- Rainy side of Washington
Very informative, I had not run across that yet. I may try it one day. What gauge pressures and outdoor temps did you use to charge/fill it?
Butt thermometer ? LOL
I have one more upgrade job on my bucket list, may just try it. What oil did you use? The one PAG??? (IIRC) The one that works with remaining mineral oil so you do not need to do a pure/complete oil swap/flush?
Sorry, forgot to put that info in.
R12: mineral oil.
R134a: PAG oil.
R152a: POE (polyol ester) oil. It's allegedly compatible with remaining PAG and mineral oils but I don't believe it, several manufacturers disagree and say it is not compatible at all. Flush all lines and components clear of old oil before filling with new.
As for how to fill with the correct quantities of refrigerant - you have to do a molar equivalence. Take OEM refrigerant quantity, divide by molar mass of OEM refrigerant. Then multiply by molar mass of replacement refrigerant. Result is how much you should use. Seems to work fine for me so far - it's how I was taught, not 100% sure why it's the method to use. You can't really use system pressures IMO because once you have reached the vapor pressure of the refrigerant (somewhere around 80-90psi for R152a at 25C...) you're gonna have some liquid and there's no real way to tell how much. But, I'm no refrigeration expert and may be missing something.