Has anyone taken out R410 from a R410 system and put in R22.

No. I wouldn't even think to try. Will be impossible by design of the 2 systems.

I have seen that only once, where a hvac tech didn't read the ID plate to charge a leaking system that had leaked all of the R410a out, and recharged it by ACCIDENT with R-22. It did NOT work after the recharge!!

Sort of expensive but can be done. You need to change the compressor and metering device

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Originally Posted by eschuen

sort of expensive but can be done. You need to change the compressor and metering device

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You need to flush all the POE oils and add mineral oil. You will have a flooded condenser coil. Since 410A has more BTU per lb. than r-22, the condenser coil is smaller. And on and on and on. You may as well make your own A/C system.