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Posted: 6/15/2016 8:17:33 PM EDT
[#1]
Bump...
Not a HVAC guy but I would replace the lines. Different oils etc.. I'm not certain if a good nitrogen purge and 500 micron vacuum would clean the old oils. The HVAC guys will be along soon... Looking forward to their response and learning something. |
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Posted: 6/15/2016 8:35:41 PM EDT
[#2]
Replace the lines.
The process to clean them out for the different lubricant is not worth the time., effort, or chance. |
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Posted: 6/15/2016 8:36:44 PM EDT
[#3]
Quote HistoryQuoted:
Replace the lines. The process to clean them out for the different lubricant is not worth the time., effort, or chance. What if it is 80 feet of line and two stories, and down a brick wall? |
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Posted: 6/15/2016 8:44:09 PM EDT
[#4]
I worked in a townhouse that the line set was built into a load bearing wall and like 70 feet long.
the labor to remove it would have been rediculous. it was Re used. I say it's fine but if it is easy to get to and my house I'm replacing It |
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Posted: 6/15/2016 8:50:39 PM EDT
[#5]
If they are the right size they can be reused.
Not an HVAC guy but I work in the apartment industry and we are dealing with this industry wide across the country. |
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Posted: 6/16/2016 10:53:42 AM EDT
[#6]
Quote HistoryQuoted: What if it is 80 feet of line and two stories, and down a brick wall? Quote HistoryQuoted: Quoted: Replace the lines. The process to clean them out for the different lubricant is not worth the time., effort, or chance. What if it is 80 feet of line and two stories, and down a brick wall? If it is rather easy and practical to do so, sure, go ahead and replace it. Depending on if you are increasing/decreasing sizes, the diameters of the lineset (especially the suction line) may change. Typically, the liquid line (the smaller one) is usually 3/8", but the larger (suction) line will vary depending on the size of the unit. Sometimes I've seen where contractors who are re-using the lineset have to match up the new units size to the old suction line and there's a 1/8" difference. There's usually no harm in this, but anything more than 1/8" can be looking for trouble to start down the road. Also what I mean by "easy", is the lineset on the outside of the exterior wall? When it goes into the home, would it be easy to gain access to braze the joint where the lines would meet? For my own house, the lineset is actually inside the wall so I'll be re-using that thing for quite a while. |
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Posted: 6/16/2016 11:03:36 AM EDT
[#7]
Quote HistoryQuoted:
What if it is 80 feet of line and two stories, and down a brick wall? Quote HistoryQuoted:
Quoted:
Replace the lines. The process to clean them out for the different lubricant is not worth the time., effort, or chance. What if it is 80 feet of line and two stories, and down a brick wall? What size are your current lines? 
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Posted: 6/16/2016 11:30:56 AM EDT
[#8]
Quote HistoryQuoted:
What if it is 80 feet of line and two stories, and down a brick wall? Quote HistoryQuoted:
Quoted:
Replace the lines. The process to clean them out for the different lubricant is not worth the time., effort, or chance. What if it is 80 feet of line and two stories, and down a brick wall? When the new system fails early and the warranty is voided you can save again. |
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Posted: 6/16/2016 1:36:34 PM EDT
[#9]
Quote HistoryQuote HistoryQuoted: Quoted: Quoted: Replace the lines. The process to clean them out for the different lubricant is not worth the time., effort, or chance. What if it is 80 feet of line and two stories, and down a brick wall? What size are your current lines? http://i63.tinypic.com/ie1kxc.jpg That's a good rough guide, however each manufacturer has different specs for their units. OP needs to use the specs for the new unit he wants and compare to existing lineset. |
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Posted: 6/16/2016 5:25:39 PM EDT
[#10]
Quote HistoryQuoted:
That's a good rough guide, however each manufacturer has different specs for their units. OP needs to use the specs for the new unit he wants and compare to existing lineset. Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
Replace the lines. The process to clean them out for the different lubricant is not worth the time., effort, or chance. What if it is 80 feet of line and two stories, and down a brick wall? What size are your current lines? http://i63.tinypic.com/ie1kxc.jpg That's a good rough guide, however each manufacturer has different specs for their units. OP needs to use the specs for the new unit he wants and compare to existing lineset. And then figure out what he is going to do with the contaminated solvent. |
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Posted: 6/16/2016 8:27:33 PM EDT
[#11]
Replace. If your spending that kind of money a lineset is cheap. Especially since your getting a new A coil and condensing unit. Be smart and stop trying to cut corners.
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Posted: 6/16/2016 8:54:56 PM EDT
[#12]
it depends, what size do you have and what brand, model are you installing? go by the manufactures specs.
you must maintain a certain velocity in order to have proper oil return to the compress or your bearings in the compressor will run dry |
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Posted: 6/17/2016 9:21:21 AM EDT
[#13]
Quote HistoryQuoted: And then figure out what he is going to do with the contaminated solvent. Uh, if there's some kind of 'contaminated solvent' in the lineset once you get the system installed and filled with refrigerant, you've got bigger problems coming than properly sizing the lineset. |
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Posted: 6/17/2016 1:28:15 PM EDT
[#14]
Quote HistoryQuoted:
Uh, if there's some kind of 'contaminated solvent' in the lineset once you get the system installed and filled with refrigerant, you've got bigger problems coming than properly sizing the lineset. Quote HistoryQuoted:
Quoted:
And then figure out what he is going to do with the contaminated solvent. Uh, if there's some kind of 'contaminated solvent' in the lineset once you get the system installed and filled with refrigerant, you've got bigger problems coming than properly sizing the lineset. The contaminated solvent will be in the bucket you pumped it into when cleaning the lineset. |
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Posted: 6/17/2016 8:48:24 PM EDT
[#15]
Being in the HVAC trade if it was my house I would replace the line set. It is cheap insurance
R22 and R410A oils are different, and when R22(mineral) oil mixes with the R410A(POE) oil the oil become acidic and gums up. So 2 things start happening the acid starts eating away at the compressor windings, and you dont get the proper lube to the compressor. So if you would like to replace a compressor in a few years reuse the lineset. |
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Posted: 6/17/2016 10:24:33 PM EDT
[#16]
So RX-11 doesn't do what it says?
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Posted: 6/19/2016 2:33:13 PM EDT
[#17]
Quote HistoryQuoted: The contaminated solvent will be in the bucket you pumped it into when cleaning the lineset. Quote HistoryQuoted: Quoted: Quoted: And then figure out what he is going to do with the contaminated solvent. Uh, if there's some kind of 'contaminated solvent' in the lineset once you get the system installed and filled with refrigerant, you've got bigger problems coming than properly sizing the lineset. The contaminated solvent will be in the bucket you pumped it into when cleaning the lineset. The RX-11 flush needs to be completely evacuated from the lineset before any sort of new refrigerant is added. |
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Posted: 6/19/2016 4:02:19 PM EDT
[#18]
Quote HistoryQuoted:
The contaminated solvent will be in the bucket you pumped it into when cleaning the lineset. Quote HistoryQuoted:
Quoted:
Quoted:
And then figure out what he is going to do with the contaminated solvent. Uh, if there's some kind of 'contaminated solvent' in the lineset once you get the system installed and filled with refrigerant, you've got bigger problems coming than properly sizing the lineset. The contaminated solvent will be in the bucket you pumped it into when cleaning the lineset. You just dump that shit in the yard. I have plenty of places I need roundup 
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Posted: 6/19/2016 8:09:16 PM EDT
[#19]
Quote HistoryQuoted:
You just dump that shit in the yard. I have plenty of places I need roundup Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
And then figure out what he is going to do with the contaminated solvent. Uh, if there's some kind of 'contaminated solvent' in the lineset once you get the system installed and filled with refrigerant, you've got bigger problems coming than properly sizing the lineset. The contaminated solvent will be in the bucket you pumped it into when cleaning the lineset. You just dump that shit in the yard. I have plenty of places I need roundup YOU may get away tith that. Folks that have a license, insurance, etc. may not be so cavalier. |
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Posted: 6/19/2016 10:34:36 PM EDT
[#20]
I have personally watched more licensed pros vent R22 into the air than you'd imagine. I cannot imagine a little solvent would be any different.
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Posted: 6/19/2016 10:39:30 PM EDT
[#21]
Quote HistoryQuoted:
When the new system fails early and the warranty is voided you can save again. Quote HistoryQuoted:
Quoted:
Quoted:
Replace the lines. The process to clean them out for the different lubricant is not worth the time., effort, or chance. What if it is 80 feet of line and two stories, and down a brick wall? When the new system fails early and the warranty is voided you can save again. Which manufacturer voids the warranty because a lineset was reused? Not Trane, not American standard, not carrier, not Goodman. So far, they have guidance to the installer on sizing and purging from what I have found. Three quotes so far in the past three days, all from highly recommended shops, and thus far all have stated they will reuse the lineset. One told me nitrogen purge. One said solvent then nitrogen. The other said he purges with a puron flush. 
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Posted: 6/20/2016 1:01:01 AM EDT
[#22]
Unless it is a HUGE pain in the ass, my shop would recommend changing the line set, and if it were my house I would too.
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Posted: 6/20/2016 12:06:00 PM EDT
[#23]
Which manufacturer voids the warranty because a lineset was reused? None automatically. If they decide to inspect and find it was not cleaned properly they can. |
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Posted: 6/20/2016 3:40:01 PM EDT
[#24]
I'm looking at replacing my unit on a two story house. A/C guy insists
on using new lines, stating there could be any number of things wrong with the old ones. That thought, along with the things guys pointed out above make me think he is right. He will run the lines up the wall to the attic through a fake down spout. I'm not over joyed about that but it will look better than a line set running up to the attic. |
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Posted: 6/20/2016 8:19:19 PM EDT
[#25]
Replace the lineset, it's the right thing to do.
I'm not going to type out a long drawn out response about why RX11 flush is snake oil, buts it's pretty much snake oil unless you use a few gallons of it, in which case you just bought a new lineset twice over. What's 75' of lineset up a wall going to add to the job? $500-$750 to a $10k job? This is not the area where you want to pinch pennies. |
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Posted: 6/20/2016 8:51:45 PM EDT
[#26]
Quote HistoryQuoted: Replace the lineset, it's the right thing to do. I'm not going to type out a long drawn out response about why RX11 flush is snake oil, buts it's pretty much snake oil unless you use a few gallons of it, in which case you just bought a new lineset twice over. What's 75' of lineset up a wall going to add to the job? $500-$750 to a $10k job? This is not the area where you want to pinch pennies. If I remember right, most techs these days use a nitrogen purge and subsequently pull vacuum to evacuate the lines instead of that RX11 crap. Is that about right for reusing a lineset? |
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Posted: 6/20/2016 9:09:17 PM EDT
[#27]
Quote HistoryQuoted:
If I remember right, most techs these days use a nitrogen purge and subsequently pull vacuum to evacuate the lines instead of that RX11 crap. Is that about right for reusing a lineset? Quote HistoryQuoted:
Quoted:
Replace the lineset, it's the right thing to do. I'm not going to type out a long drawn out response about why RX11 flush is snake oil, buts it's pretty much snake oil unless you use a few gallons of it, in which case you just bought a new lineset twice over. What's 75' of lineset up a wall going to add to the job? $500-$750 to a $10k job? This is not the area where you want to pinch pennies. If I remember right, most techs these days use a nitrogen purge and subsequently pull vacuum to evacuate the lines instead of that RX11 crap. Is that about right for reusing a lineset? Now manufacturers are saying that the mixing of oils in small quantities doesn't hurt anything. 
Who knows? I have always just replaced the lineset. |
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Posted: 6/20/2016 9:24:31 PM EDT
[#28]
Quote HistoryQuoted:
Now manufacturers are saying that the mixing of oils in small quantities doesn't hurt anything.
Who knows? I have always just replaced the lineset. Quote HistoryQuoted:
Originally Posted By Texas smooth:
Quoted:
Replace the leanest, it's the right thing to do. I'm not going to type out a long drawn out response about why RX11 flush is snake oil, buts it's pretty much snake oil unless you use a few gallons of it, in which case you just bought a new leanest twice over. What's 75' of lineset up a wall going to add to the job? $500-$750 to a $10k job? This is not the area where you want to pinch pennies. If I remember right, most techs these days use a nitrogen purge and subsequently pull vacuum to evacuate the lines instead of that RX11 crap. Is that about right for reusing a lineset? Now manufacturers are saying that the mixing of oils in small quantities doesn't hurt anything.
Who knows? I have always just replaced the lineset. NVM. Stupid question
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Posted: 6/21/2016 3:59:31 PM EDT
[#29]
Quote HistoryQuoted:
Now manufacturers are saying that the mixing of oils in small quantities doesn't hurt anything.
Who knows? I have always just replaced the lineset. Quote HistoryQuoted:
Quoted:
Quoted:
Replace the lineset, it's the right thing to do. I'm not going to type out a long drawn out response about why RX11 flush is snake oil, buts it's pretty much snake oil unless you use a few gallons of it, in which case you just bought a new lineset twice over. What's 75' of lineset up a wall going to add to the job? $500-$750 to a $10k job? This is not the area where you want to pinch pennies. If I remember right, most techs these days use a nitrogen purge and subsequently pull vacuum to evacuate the lines instead of that RX11 crap. Is that about right for reusing a lineset? Now manufacturers are saying that the mixing of oils in small quantities doesn't hurt anything.
Who knows? I have always just replaced the lineset. Short of something in writing not worth it. When they have to pay $$ watch what they say. |
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