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R22 TO 410: HAVE TO REPLACE LINE??

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R22 TO 410: HAVE TO REPLACE LINE?? mhenkali 07-06-2007
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Posted by on July 6, 2007, 8:46 am
I have an older heat pump and am considering replacing it with a unit
that uses R422. Replacing the line from outside to inside unit will be
difficult and might involve carpentry and wall board work. A couple
guys said the old line can be cleaned out, no need to replace. Others
have said it must be replaced. Which is correct?


Posted by Noon-Air on July 6, 2007, 10:23 am

>I have an older heat pump and am considering replacing it with a unit
> that uses R422. Replacing the line from outside to inside unit will be
> difficult and might involve carpentry and wall board work. A couple
> guys said the old line can be cleaned out, no need to replace. Others
> have said it must be replaced. Which is correct?

If the lineset is correctly sized for the new equipment, it can be flushed,
but its recommended by the manufacturers that when going from R-22 to
R-410a, the lineset should always be replaced.



Posted by Geoman on July 6, 2007, 10:47 am

>
>>I have an older heat pump and am considering replacing it with a unit
>> that uses R422. Replacing the line from outside to inside unit will be
>> difficult and might involve carpentry and wall board work. A couple
>> guys said the old line can be cleaned out, no need to replace. Others
>> have said it must be replaced. Which is correct?
>
> If the lineset is correctly sized for the new equipment, it can be
> flushed, but its recommended by the manufacturers that when going from
> R-22 to R-410a, the lineset should always be replaced.

In my house there wouldn't be anything but a completely new system if I was
switching from 22 to anything else!
>



Posted by on July 6, 2007, 11:02 am

>
> >I have an older heat pump and am considering replacing it with a unit
> > that uses R422. Replacing the line from outside to inside unit will be
> > difficult and might involve carpentry and wall board work. A couple
> > guys said the old line can be cleaned out, no need to replace. Others
> > have said it must be replaced. Which is correct?
>
> If the lineset is correctly sized for the new equipment, it can be
flushed,
> but its recommended by the manufacturers that when going from R-22 to
> R-410a, the lineset should always be replaced.


Above is true, but I always like to run a new lineset with a complete
system.



Posted by Bubba on July 6, 2007, 8:24 pm

>
>>
>> >I have an older heat pump and am considering replacing it with a unit
>> > that uses R422. Replacing the line from outside to inside unit will be
>> > difficult and might involve carpentry and wall board work. A couple
>> > guys said the old line can be cleaned out, no need to replace. Others
>> > have said it must be replaced. Which is correct?
>>
>> If the lineset is correctly sized for the new equipment, it can be
>flushed,
>> but its recommended by the manufacturers that when going from R-22 to
>> R-410a, the lineset should always be replaced.
>
>
>Above is true, but I always like to run a new lineset with a complete
>system.
>

"Kids", Dont get all hung up on the line set. Im telling you.........
Size is most important. Switching from R-22 to R-410a is NO BIG DEAL.
If you dont believe me do it yourself. Blow the old line set out with
nitrogen and have someone at the other end. Watch what comes
out...basically nothing. Now, spend $100 or whatever for the Calgon
RX-11 flush. Blow that through it then blow it out again with
nitrogen. If you dont have a bunch of loop de duez and dips you"ll
find that basically almost nothing comes out.
Dont lose the job because you want to rip out someones ceiling to
replace the lineset and company B does it for a whole lot cheaper
because all they are doing is flushing it. It WILL be fine!
Now Im talking lineset only. If you want to flush a coil and lineset
or something else then you get to test that one on your own.
Just my .03 cents but it came from a VERY reputable Technical Service
Rep.
Bubba

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