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Question DetailsAsked on 10/12/2015

Do I need to change my evaporator coil when changing from a 22 system to 410 system

I'm installing a new 410, system ( condenser) on a tight budget, will I have to change the evaporator coil & metering device

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2 Answers


Under new laws taking effect this year, the evaporator and the A/C system have to be "matched" as a set with a specific energy efficiency (SEER) rating - so unless your evaporator is fairly new and happens to be rated for R-410a pressure AND be a match for the new system (and is thoroughly cleaned to remove the old oil, which is incompatible with new systems), so extremely likely you need a new one.

New systems come complete with everything but the copper tubing to carry the refrigerant to the evaporator anyway - plus without a new evaporator you would not be getting a full warranty on the system (if any at all), and evaporators are one of the most common items to fail, so I would not buy a new system without ALL new components. You do NOT want to be in a situation where the manufacturer or contractor can say your warranty does not cover the problem because your old evaporator contributed to it (whether true or not).

And yes, the control valves are specific to the system and are part of the "rated" energy efficiency - plus R-410a runs at a significantly different pressure than R-22, so control equipment for one would not work on the other.

So - go for a completely new system.

Answered 4 years ago by LCD


Doing so is the best decision. It could be an acceptable match, but unlikely that it would get the same efficiency as a new "matched" coil,which at the least will cost you more to operate. At the worst, it will shorten the life of the new Condenser.


Answered 4 years ago by BayAreaAC

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