410 coil with 22 Condenser?

[martlet]

I'm a consumer who is an avid reader and infrequent poster on the HVAC Talk site. I read with great interest Norm's comments on flushing r22 lines with RX-11 solvent. I am currently replacing a coil in a 2nd floor air handler currently using R22. I would like to leave the outside condenser alone for the next year so that I can afford to upgrade it to r410. Can I install an r410 coil and later flush it and the lines when I go to the new r410 condenser unit outside?

Additionally I've learned that my in-the-wall lines to the attic to the existing r22 unit are slightly smaller than required for rheem r410 condensers (just upgraded the downstairs unit to this and will upgrade outdoor unit also to weatherking or rheem) My HVAC pro says the lines will support the r410 unit but opperate at a slightly lower efficiency. Is there a compelling reason to run new lines outside of my structure to make it a perfect match?

Thanks

Scott

ps - I tip my keyboard to everyone on this site for maintaining a great discussion. I had previously enjoyed reading about engineering involved in vacuum cleaners - unfortunately that site's participants should have learned from this site and eliminate all flamable discussion. For those interested in vac's I highly recommend reading James Dyson's book, Aginst The Odds - absolutely fascinating. Here is a link:
http://www.amazon.com/gp/product/1587991705/104-7826713-5723110?v=glance&n=283155

[danglerb]

Your going to get opinions for every option, some always replace, some when its not too hard, some only when there is a problem. Regardless of what anybody says here, your installer is the one you call when there is a problem, so what he says gets top billing.

Have you looked at how much more the total job is going to cost by breaking it up into coil then condenser? Plus the loss of the combined warranty? I just would not do it that way, too many open windows for problems to crawl in.

*** I'm waiting for the MicroSoft vacuum, it should really suck.

[BaldLoonie]

What size are the lines? What capacity unit do you need? I don't recall that Rheem has different line sizing for 410 but could be wrong. In Rheem's line, they have factory TXVs for the different refrigerant so you can't easily swap. In other brands, it could be easier. Some brands still use piston coils and all you'd have to do is swap a piston when the time comes to change outdoor units.

[martlet]

Hi John - thanks for the reply. I'm double checking this with my professional now. -Scott

[gunz]

you can use the r410 coil except since your running r22 through it when you change the condenser that coil is contaminated and will screw up your new condenser. it's better and cheaper to replace it all with the r410 at the same time since you will anyway eventually have to anyway!!