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Question DetailsAsked on 11/27/2016

Can i install a 410a compressor in a r22 unit

My ac unit's compressor broke down (r22 unit) i found a new compressor for cheap but it is a 410a. I would like to know if i can install this new compressor and if yes what other parts i have to change. I know i have to flush the coil.

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2 Answers



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Answered 3 years ago by Member Services


If you mean run R-410a in an R-22 designed system - not going to work right, and even if you got the pressures to hold and run right without rupturing components, the cooling capacity of the sytem would be less than it is now by maybe about 15-25% running with R-22 system setpoints. Give up on that idea if that is what you mean - with current component costs, changing an R-22 system to R-410a just does not make sense, though depending on what class tubing was used it is sometimes possible to reuse the copper linesets if in good shape - though due to the gross incompatibility of the oils between the two gas classes I recommend total system replacement - ALL components - if changing to R-410a system.

Assuming now that you meant stahying with R-22 but using an R-410a rated compressor - possibly - depending on whether that compressor is designed to run with the lubricating oil in the R-22 (likely mineral oil but several other varieties are used), whether your fan will cool it adequately, etc. You or an HVAC contractor would have to check manufacturer compatibility charts to see if that unit will be compatible - not real likely, but there are some out there which can be used in several types of gas environments. However, if the compressor is not from the same manufacturer you are almost certainly not going to find compatibility charts for it in your application.

You would also have to replace the safety vent or "popoff valve" (if your system has one) or add one in if not, so if the control valve (TPX, TXC, TXV, etc valve) fails to shut your system off when it reaches design pressure in the system or the compressor gets "slugged" with liquid it does not cause a lineset or condensor coil or evaporator coil failure, because R-410a systems run at significantly higher pressure (about 50% higher at same temperature) than R-22 ones, so a R-410a compressor might be designed to put out higher max pressure which might exceed the capacity of your R-22 components.

BTW - you would have to flush the entire system if changing lubricants, not just the evaporator coil - because the lubricant moves around through the entire system with the gas. And change the filter/dryer for a new one designed for the type of lubricant being run if changing lubricant.

Also - assuming the compressor had been test-run at the factory with the likely synthetic oil commonly used for R-410a (though some come out of the factorty without being test run), yuou are never really going to get all that oil out of the compressor with a flush, so you will get at least some gumming up of the control valve and the filter/dryer element - not a good situation.

I would say skip trying to save a hundred bucks or two and get the right compressor for your application.

And this does not address the legality issue - unless you are an HVAC tech with EPA license, it is not legal for you to discharge or charge the system or buy the gas (though it is sold on the web) anyway.

Oh - one other thing - unless the compressor is rated for that system, and with many manufacturers unless it is installed by a licensed HVAC tech, it will be without warranty.

Answered 3 years ago by LCD

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