"GaryMichael" wrote in message
ups.com...
I've gotten conflicting advice on whether or not to replace the line
between inside and outside unit. Some say the current line with R22
can be purged and then used with 410. Others say no, can't be
thoroughly cleaned and will cause problems down the road. Unit is a
heat pump, if that matters. Any thoughts?


Just posted in another group... my comment is at the end.


"Noon-Air" wrote in message
. ..

wrote in message
ups.com...
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.