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jeff5may · 06-03-14, 08:02 PM

The r-22 retrofit is probably Dupont MO99 "isceon". That seems to be what the pro's are replacing with lately. Not quite as well performing as R22 or propane, it's a cocktail of the same stuff that's in r410 plus some more gases. All the new "acceptable, industry standard" refrigerants are pretty much made of the "magic 5" gases so you have to have a license to purchase them. I believe many of the 400-series refrigerants are a fad, a band-aid for now. They will be replaced shortly.

It's ASHRAE number is R-438a. And it's expensive (recycled r-22 is cheaper). It's supposed to be the closest thing to real r-22 so far. Only it has a 10 degree glide (doh).

If the r-22 retrofit is whole, I would leave it how it is and figure out how to blow air where you want it. The R-134a one is hackable, since you can get refrigerant anywhere.

06-03-14, 08:02 PM	#2
jeff5may Supreme EcoRenovator Join Date: Jan 2010 Location: elizabethtown, ky, USA Posts: 2,428 Thanks: 431 Thanked 619 Times in 517 Posts	The r-22 retrofit is probably Dupont MO99 "isceon". That seems to be what the pro's are replacing with lately. Not quite as well performing as R22 or propane, it's a cocktail of the same stuff that's in r410 plus some more gases. All the new "acceptable, industry standard" refrigerants are pretty much made of the "magic 5" gases so you have to have a license to purchase them. I believe many of the 400-series refrigerants are a fad, a band-aid for now. They will be replaced shortly. It's ASHRAE number is R-438a. And it's expensive (recycled r-22 is cheaper). It's supposed to be the closest thing to real r-22 so far. Only it has a 10 degree glide (doh). If the r-22 retrofit is whole, I would leave it how it is and figure out how to blow air where you want it. The R-134a one is hackable, since you can get refrigerant anywhere. Last edited by jeff5may; 06-03-14 at 08:05 PM..