R-22 Refrigerant ‘ replacements – HVAC-Talk: Heating, Air …

Mike and I are kicking around whether or not there is a good alternative refrigerant for R-22 in A/C service ??

ICOR Nu22-B came up - is there any info you learned folk can pass on?

Past use, oil change info, capacity loss / gain etc. would be appreciated - or is is a buch of ' snake oil ' ?? Perhaps this discussion has already gone around the bases ??

Thanking you in advance - - - - -

Superheat and subcooling tell it all !

"The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money. - Alexis de Toqueville, 1835

What I always found ironic about the phase out is in the end its because these refrigerants are said to deplete the ozone. Global warming accelerates the ozone depletion process, refrigerants have a GWP number as well, global warming potential. R-410A, the R-22 replacement has a higher GWP than R22 but R22 has a 0.034 ODP while R-410A is "approximately" zero. I guess I don't understand how one is better than the other. The largest global warming source, coal fired utilities, are unregulated when it comest to CO2.

God Bless the USA

We recently had a very bad experience with NU-22 on a 100Ton Trane split system. The unit has 8 compressors and a few of them were being replaced; reason(s) for failure is unknown. The technician who replaced compressors and was charging the system was under the assumption the NU-22 refrigerant was a drop-in, so he was just adding refrigerant to clear the sightglass. That would be a mistake in any case, adding refrigerant without measuring superheat and subcooling. Anyway, the new compressors failed, locked-up, oil was washed out. To make a very long story short, more new compressors were installed, but R-22 was put back in the unit, and those compressors are still working. Is NU-22 or NU-22B a drop-in refrigerant? I don't think so. Is NU-22B an acceptable replacement? I don't know, but I am convinced that great care should be taken to get before and after measurements, particularly superheat. The PT chart for NU-22 and NU-22B suggests that the TXV would need to have spring pressure increased when the conversion is done.

We're awl pawthetic and kweepy and can't get giwrls. That's why we fight wobots.

Copper wouldn't hold those pressures, either.

God Bless the USA

I'm just wondering what everone elses lessons were when r12 went out. Mine was a little stress for the first 1.5 years or so then I played around with two of the drop in replacements and settled on Hot Shot.

I even had a guy try to sell me a new jug of R12 and turned him down cause Hot Shot has so far taken care of all the R12 needs I've had.

Point is, for me, the R12 thing became a non-thing very quickly once I found a suitable replacement.

"The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money. - Alexis de Toqueville, 1835

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