R410A to R-22

sorefoot

Other than pressure switch settings and oil charge, is there any reason you can not use R-22 in R410A condensing unit with R-22 evap coils? 25 ton coils are expensive to change unless totally NECESSARY. Manufacturers are using the CYA argument. Is it legitimate? Thanks

jpsmith1cm

Since there is a HUGE difference in capacity between the two refrigerants, I'm going to say that it won't work well.

The oil would be a non-issue as POE is compatible with all types of refrigerant, that isn't an issue.

jakereynolds

I think there is a potential issue with rubber seal deterioration as well.

siddle

Many contractors are experiencing compressor burnout problems with R-410A HVACR systems soon after they're converted from R-22 refrigerant.

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beenthere

Then they aren't doing something right.

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costello

i would say that the condensing coil would be different in the capacity and if you are using the same compressor there might or there is a difference in the pumping ratio in the compressors but i could be wrong on this.

beenthere

BTU for BTU, an R22 compressor moves more refrigerant then an R410A compressor. So using R22 in a R410A condenser, will lower its capacity.

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siddle

What do you think the problem may be? Any ideas?

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beenthere

Some possible causes.

Didn't blow out the line set if they reused it, and left too much min oil in the system.

Reused old indoor coil and didn't blow it out, or its mismatched to the condenser.

Didn't pull a low enough vacuum, which left too much moisture in the system.

Poor brazing technique. Causing leak problems and running system in a vacuum drawing air and moisture into the system, then pumping the remaining charge into the condenser when to fix the leak, which means only pulling a vacuum on the line set and coil, leaving moisture in the charge that has been pumped back into the condenser, causing an acid burn out later.

Often, the LLFD isn't changed when the leak is at a braze joint outside of the condenser. A few minutes saved along with a few dollars for the LLFD that wold ahve to be replaced under warranty. And you end up a problem that is wrongfully blamed on R410A.

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siddle

Thank you so much. Lemme check whether it works or not. I'll let you know soon.

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Naplesjeepboi22

R410a requires much less compressor horsepower per ton then R22 due to running with a higher compression ratio .So running R22 in a R410a compressor could cause over amping even with a low head and high suction potential High superheat and ultimately burn the compressor another problem may be oil return. Would not recommend this practice. If it was meant to run on R22 , R407C Etc it would have a alternate rating on it.

beenthere

If it had a higher compression ratio, then it would take more horse power.

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rmihvacr

Volumetric compression will not allow the use of a 410A compressor with r22. don't waste your time or money.

HCTXFPMCJC

Beenthere said:
Didn't pull a low enough vacuum, which left too much moisture in the system.

Amen to that!!