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In a residential system that presently has a 3/8 -5/8'' lineset 30 ft long on a R22 system, can a 2.5 ton 410A system work on that size lineset?

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  • Jeremy Reddick
    Jeremy Reddick May 11, 2010

    NOOOOO. The brazes will not hold up and you will be mixing the different oils. You are upgrading to a lot higher pressure unit, that needs to have its own set of lines ran and be brazed correctly to not break under the pressure

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Look at the manufacturer's instructions and it will tell you how much line set the factory charge is good for. Don't plan on using the same line set that was hooked to the R22 unit as R22 and R410a use different types of oil that are not compatible. Hope this helps.

Posted on May 05, 2010

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I would highly recommend that you get a friend or hire a pro, to deal with this. You dont just add freon, is it -R22 or the new 410A type? You always charge a system from the outdoor unit! If this is a new outdoor condensor, it will be pre charged for the unit, indoor coil and roughly 15 to 25 foot of line set. But after the brazing is done,,, NEVER SOLDERING! You need to use a Vac-Pump and pull the indoor coil and lineset down to 500 microns, before you open the king valves.
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