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Air Conditioner Lineset - What Is It?

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Air Conditioner Lineset - What Is It?

Old 05-12-2018, 07:51 AM
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Default Air Conditioner Lineset - What Is It?

I have seen threads in regard to air conditioners in which the term “lineset” is used. Am I correct in thinking that this is the line, electrical and copper coils, between the outside unit and the inside coils?
I am in the market to replace a 10year old builders Lennox system which is on its last legs. The only problem is the lines from outside enter at ground level, go up Inside an inside wall, across a vacant attic space, under a floor and arrive somehow at the air handler/coil. In other words it would be extremely hard to run a new line. Can the old line be used in any way?
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Old 05-12-2018, 07:56 AM
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What seems hard to you is every day life to the tradesman that will be servicing it for you.

let them worry about those details.
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Old 05-12-2018, 07:58 AM
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The lineset is piping between the interior and exterior components of the A/C system. It should be reusable between different installs, but if not, they would likely run new piping up the side of the house, which can be covered with a "lineset cover" (google it) to dress it up a bit and protect the insulation on the pipes.
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Old 05-12-2018, 08:01 AM
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The lineset can be reused IF it is the correct size for the new unit.
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Old 05-12-2018, 08:02 AM
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Originally Posted by Jimm View Post
I have seen threads in regard to air conditioners in which the term “lineset” is used. Am I correct in thinking that this is the line, electrical and copper coils, between the outside unit and the inside coils?
I am in the market to replace a 10year old builders Lennox system which is on its last legs. The only problem is the lines from outside enter at ground level, go up Inside an inside wall, across a vacant attic space, under a floor and arrive somehow at the air handler/coil. In other words it would be extremely hard to run a new line. Can the old line be used in any way?
When I replaced my 20 year old Goodman coils and compressor, the Trane dealer was able to use my existing lineset.
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Old 05-12-2018, 08:16 AM
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Originally Posted by dev View Post
The lineset is piping between the interior and exterior components of the A/C system. It should be reusable between different installs, but if not, they would likely run new piping up the side of the house, which can be covered with a "lineset cover" (google it) to dress it up a bit and protect the insulation on the pipes.
yep, what he said
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Old 05-12-2018, 08:27 AM
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I was under the impression that R-410A systems that were converted from R-22 refrigerant need a larger size line set.
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Old 05-12-2018, 09:13 AM
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They’re probably the wrong size for New 410 systems. When my hvac guy updated mine from an R22 system both lines needed to go up one size even though we stayed at a 3 ton system.
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Old 05-12-2018, 09:19 AM
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Honestly, there is so much to HVAC no one will be able to tell you if your old lines can be reused. There is also a warranty concern using old lines. If they have to run new lines, like the did in my house they can do it in a way that does not look too bad.

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Old 05-12-2018, 10:00 AM
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Old lines will have residual mineral oil from the old compressor, new ones have synthetic. Most manufacturers strongly recommend not mixing oils. But if you are reusing

the old evap coil it's going to happen, flush kits are available, blowing out lines with dry nitrogen is an option.

Many variables, are you using the old air handler and coil? What refrigerant? You can search AHRI directory to see if your new equipment will be matched

and HVAC Load Calculation - Maunualj - Whole House Loadcalc to determine if its sized right.
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Old 05-12-2018, 01:16 PM
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https://www.reliantairconditioning.c...c-terminology/
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Old 05-12-2018, 01:26 PM
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NO manufacture requires the refrigerant lines replaced from r-22 to r-410a. A proper clean out and evacuation is required. Line set size will not be a larger requirement for R-410a versus R-22. The opposite is true. If you have a R-22 3 ton system and they replaced the line set due to size because you were switching to R-410a, you paid for something you did not need.

A 3 ton R-410a compressor requires 3/4 suction and 5/16 liquid line. Optional size is 5/8 or 7/8 on suction with 3/8” liquid line. The loss is minimum and the increase of refrigerant is less than a lb.
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Old 05-12-2018, 02:56 PM
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Originally Posted by bsh102 View Post
NO manufacture requires the refrigerant lines replaced from r-22 to r-410a. A proper clean out and evacuation is required. Line set size will not be a larger requirement for R-410a versus R-22. The opposite is true. If you have a R-22 3 ton system and they replaced the line set due to size because you were switching to R-410a, you paid for something you did not need.

A 3 ton R-410a compressor requires 3/4 suction and 5/16 liquid line. Optional size is 5/8 or 7/8 on suction with 3/8” liquid line. The loss is minimum and the increase of refrigerant is less than a lb.
If so then I did get screwed. I have had to have many in our rentals replaced, some of the air handlers are up in the attic a ways from the compressor. The lower unit are very close and he did use the old line sets on a few of them, but he told me he really did not want to do that. On the uppers they ran the new line sets through a false down spout like Lornes.
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Old 05-12-2018, 05:48 PM
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its always nice when you do a new system to replace everything if you can.matched components,lineset,t stat whatever else you can that way some old parts dont nag you.somtimes you cant,wont,dont for various reasons a clean install most time wont come back to haunt you.
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Old 05-12-2018, 06:02 PM
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Sometimes the sizes stay the same, sometimes not. Depends on the efficiency of new equipment, the length of the run.
also if the old lines fittings were soldered with a low temp solder like Staybrite 8, it has to be replaced .
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Old 05-12-2018, 06:09 PM
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Originally Posted by mikeloew View Post
If so then I did get screwed. I have had to have many in our rentals replaced, some of the air handlers are up in the attic a ways from the compressor. The lower unit are very close and he did use the old line sets on a few of them, but he told me he really did not want to do that. On the uppers they ran the new line sets through a false down spout like Lornes.
Depending on how long the run was and what the original size was, it could have been in your best interest to change them. I've never tried to up sell a lineset, they may have.
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