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Question DetailsAsked on 8/15/2016

How long to replace a AC evaporator coil? Easy access in garage. Ac unit right behind unit out side the wall.

4 ton Goodman 21 in.coil. Same size unit only new coil will handle old and r22 freon. Ac unit right behind coil unit out side the wall.

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You say "same size unit only new coil will handle old and r22 Freon" - not sure what you mean there. The coil has to match the system to work right, and has to be rated for the pressure - so if an old unit sometimes you can, sometimes you can't get a compatible coil, and can end up being forced into buying a whole new unit instead.


With rare exceptions, you cannot run an R-22 coil on R-410a (the common current refrigerant till the EPA also phases it out in a few years) because the pressure is a lot higher - plus if you replace the whole outside unit with new you HAVE to connect it to a coil that it is rated with - and VERY few are rated with more than none coil model, so if whole outside unit needs replacement basically you are putting in a new evaporator (indoor) coil too. Trying to run an existing R-22 coil on the "same size unit" say 4 tons in your case, almost certainly will not work anyway, because the heat transdfear efficiency of R-410a is substantially less than R-22, so for the same cooling capacity while the same tonnage unit will remove the same amount of heat, the coil is going to have to be either a lot more efficient, move a lot more refrigerant and air through and past it, or be bigger in cooling surface area than with the R-22 system.


Lots of prior questions with answers on this issue, R-22 replacement gases, the economics and decision process of fixing a leaking evaporator coil (for $1000-2000 commonly) versus putting in a new unit, etc can be found in the Home > HVAC link in Browse Projects, at lower left.


Anyway - excluding any delivery time if a coil has to be ordered rather than in-stock or picked up/delivered by at an in-town distributor, probably no less than 2 hours to do the actual changeout and commonly up to about 4 in more difficult cases or if he has to look at it first then go to shop/distributor to get parts to match.

Answered 2 years ago by LCD




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