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R22 to 410: Need to replace line?

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R22 to 410: Need to replace line? GaryMichael 07-06-2007
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Posted by GaryMichael on July 6, 2007, 9:20 am
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?


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Posted by Meat Plow on July 6, 2007, 10:03 am
On Fri, 06 Jul 2007 06:20:10 -0700, GaryMichael wrote:

> 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?

I would replace the line if there were ANY doubt. Filter/dryer units can
be installed for contaminants but I've never heard of one to filter R22
from an R410 system.



Posted by GaryMichael on July 6, 2007, 10:09 am
> On Fri, 06 Jul 2007 06:20:10 -0700, GaryMichael wrote:
> > 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?
>
> I would replace the line if there were ANY doubt. Filter/dryer units can
> be installed for contaminants but I've never heard of one to filter R22
> from an R410 system.

I agree, but there could be problems running the new line above a
finished ceiling, that's why I'm seeing if there's any alternative.


Posted by on July 6, 2007, 11:06 am

> 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.


>
> >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 Moe Jones on July 6, 2007, 1:54 pm
: quoted-printable

Check with your local HVAC contractor. In allot of cases when you go =
with a change of using a different refrigerant, most newer units have =
stepped up the size of the suction line from lets say a 7/8" to 1 1/8" =
line for proper oil return.

Plus the newer units use a different refrigerant oil so you do not want =
any of the older oil to mix with the new oil. You can flush out the old =
oil but it does cost allot of money to do so,

--=20
Moe Jones
HVAC Service Technician
Energy Equalizers Inc.
Houston, Texas=20
www.EnergyEqualizers.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?

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<DIV><FONT face=3DArial size=3D2>Check with your local HVAC contractor. =
In allot of=20
cases when you go with a change of using a different refrigerant, most =
newer=20
units have stepped up the size of the suction line from lets say a 7/8" =
to 1=20
1/8" line for proper oil return.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Plus the newer units use a different =
refrigerant=20
oil so you do not want any of the older oil to mix with the new oil. You =
can=20
flush out the old oil but it does cost allot of money to do =
so,</FONT></DIV>
<DIV><BR>-- <BR>Moe Jones<BR>HVAC Service Technician<BR>Energy =
Equalizers=20
Inc.<BR>Houston, Texas <BR><A=20
href=3D"http://www.EnergyEqualizers.com">www.EnergyEqualizers.com</A></DI=
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<DIV>"GaryMichael" &lt;<A=20
=
wrote=20
in message <A=20
=
183728010.027043.161780@w3g2000hsg.googlegroups.com</A>...</DIV>I've=20
gotten conflicting advice on whether or not to replace the =
line<BR>between=20
inside and outside unit. Some say the current line with R22<BR>can be =
purged=20
and then used with 410. Others say no, can't be<BR>thoroughly cleaned =
and will=20
cause problems down the road. Unit is a<BR>heat pump, if that matters. =
Any=20
thoughts?<BR></BLOCKQUOTE></BODY></HTML>

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