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Old 07-07-2013, 05:33 PM   #16
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3/4" vs 7/8" vapor line


whatever the condenser size is is what I use.

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Old 07-07-2013, 06:10 PM   #17
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3/4" vs 7/8" vapor line


York makes a good unit but if U want a 2 stage setup you need a furnace with a 2 stage capable circuit board hookup for the extra speed. need a Y1 and Y2 with any brand. does yours have that. the newer Carrier and I imagine Bryant coils have the TX valve mounted internally and sit inside the ductwork not an added TX valve outside.
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Old 07-07-2013, 07:15 PM   #18
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Thanks, BT, that York condenser would be a perfect match for my Hamilton/York 2 stage variable speed furnace (that I installed with you and Yuri's help for figuring out the venting). So maybe I'll have a fall/winter project. ;-)

Yuri, my Carrier coil is about 2007 vintage CNRVP with the tin-plating. I didn't install it until 2011. The TXV is visible but it doesn't have a threaded eq line connection. I actually bought a R410 txv back then in anticipation and have it in my HVAC parts box but my Bryant R22 system keeps on going. I guess I'd have to cut off/crimp/braze shut the existing eq line, then punch and braze in the new one. Otherwise the TXV bolts right in. That doesn't look to be too difficult.

But I dunno. My current system is still working fine so I am in no rush. But it's good to keep up on the options...
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Old 07-07-2013, 09:10 PM   #19
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3/4" vs 7/8" vapor line


In 2007 was it a 13 SEER coil or lower? May not be a good match now if it is lower.
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Old 07-07-2013, 09:27 PM   #20
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3/4" vs 7/8" vapor line


In 2006 all conventional equipment made for use in the USA had to be a min of 13 SEER.
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Old 07-07-2013, 11:06 PM   #21
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3/4" vs 7/8" vapor line


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Soft rolled copper is not charged with nitrogen. It is cleaned and dehydrated. We don't throw away a roll because we only used 30 foot of the 35 foot. We seal the ends, and use it on some other job. Often, to extend a line set.
Shop at the recycle yard on a Friday afternoon.
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Old 07-08-2013, 06:54 AM   #22
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3/4" vs 7/8" vapor line


Good point Yuri... I am not sure what the coil's SEER is. I'll have to take a close look at the label plate to see what info it provides, at least a mfg date. I wonder if my memory is accurate. ;-)

Good tip, Bob, to look for scraps of tubing in a recycle yard.. or I guess at a scrap metals dealer. It's strange that 3/8 is readily available in short coils of 10' but the bigger stuff seems to only come in 30' or longer coils.... at least from what I can find online. But I wouldn't need any if I kept my existing coil and went with a 3/4" condenser.
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Old 07-08-2013, 11:49 AM   #23
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3/4" vs 7/8" vapor line


1/4 and 3/8 are very common for plumbing and oil burners etc (small jobs) whereas the 5/8 and up is only for AC and BBQs/furnaces etc which would involve longer runs or a lot of coupling together of those 10 ft rolls.
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Old 07-08-2013, 12:10 PM   #24
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Agree it certainly wouldn't make sense to couple 10' rolls! That would be silly when they are readily availble in full lengths. Just might be nice if they sold them for those times when we maybe need a few feet for an extension or whatever. Some of us who don't have access to job leftovers!

On another topic related to upgrades... one that probably has been discussed before... I think R410a is itself slated to be replaced due to its high GWP. I don't know when (soon?) or with what (407c perhaps?) but thinking my R22 system might last until that occurs and maybe I can skip the 410a era entirely.


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1/4 and 3/8 are very common for plumbing and oil burners etc (small jobs) whereas the 5/8 and up is only for AC and BBQs/furnaces etc which would involve longer runs or a lot of coupling together of those 10 ft rolls.
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Old 07-08-2013, 12:16 PM   #25
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Ya never know. Bryant in my experience is the higher end of the Carrier family and their ACs were/are very well built (except for the builders grade) so I suspect it could go 25 yrs, depends on your climate and the number of running hours. only so many of them per compressor.
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Old 07-08-2013, 12:59 PM   #26
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It is builder's grade... well, I assume it's builder's grade since my builder didn't splurge on anything as far as I can see. But most folks in my neighborhood still have the originals so the condensers seem to be pretty durable. Hope I didn't take too much life off of mine by running 275 psi for awhile. Now back to ~215-220 post-cleaning.

I have a friend that lives in a 100 year old townhouse down in VA and he has a 1974 vintage Carrier split A/C that he claims still works fine. He says the house's ducting predated the a/c install so it isn't really balanced that well. It doesn't get much use as he also has a couple of strategically placed window units that he uses mostly. So maybe his Carrier will go another 25 years??
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Old 07-08-2013, 02:32 PM   #27
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3/4" vs 7/8" vapor line


I have been wondering some of the same. I am looking into the eventual replacement of my AC and the possibility of reusing the lineset. Existing is 3/8" and 3/4", and new 410a 3 ton are 3/8" 7/8" My existing lineset is longer, around 50ft and is run through the unfinished attic. Sounds like it would be best to replace it.

Speeking of longevity, I have the original Westinghouse installed in 1981 (32 years old) It still runs like a champ. 18-20° delta T, and can keep the house 25° below the outside temp. I usually leave it set for 78°. I just wish it had a little more capacity. Seems the design temp for my location was 100°, but we have a lot of days over that and it just can't maintain the set point. In addition to the age, the cost of electricity in my area makes the return on investment for a 16SEER single stage and basic furnace about 3 years.
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Old 07-08-2013, 03:06 PM   #28
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3/4" vs 7/8" vapor line


the reson some of those old birds lasted a long time was very simple. They had a GOOD heavy duty compressor and if you were real lucky the one made by Tecumseh. OLD old company who makes great small engines for snow blowers etc. Mom's old genuine Keeprite (Canadian made) is 33 yrs old and may look real ugly but still gets you were you want to go and has the Tecumseh compressor. They DO NOT make that quality anymore.

In California I would want the Lennox 25 SEER unit, probably pays for itself in 6 months.
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Old 07-08-2013, 04:09 PM   #29
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3/4" vs 7/8" vapor line


You can gt a 3/8X3/4 lines et in a 15 foot length.
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Old 07-08-2013, 04:10 PM   #30
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Originally Posted by FixitDragon View Post
I have been wondering some of the same. I am looking into the eventual replacement of my AC and the possibility of reusing the lineset. Existing is 3/8" and 3/4", and new 410a 3 ton are 3/8" 7/8" My existing lineset is longer, around 50ft and is run through the unfinished attic. Sounds like it would be best to replace it.

Speeking of longevity, I have the original Westinghouse installed in 1981 (32 years old) It still runs like a champ. 18-20° delta T, and can keep the house 25° below the outside temp. I usually leave it set for 78°. I just wish it had a little more capacity. Seems the design temp for my location was 100°, but we have a lot of days over that and it just can't maintain the set point. In addition to the age, the cost of electricity in my area makes the return on investment for a 16SEER single stage and basic furnace about 3 years.
Add insulation to the attic. See about sealing the house better. might be able to decrease your heat gain by 6,000 BTUs or more.

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