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Old 07-29-2013, 03:53 PM   #16
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Copeland scroll running backwards. I am not kidding.


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Uh, no need for gauges... I starting thinking a bit and if there is any restriction at all between the comp and A coil (filter/drier), that would probably vaporize the liquid line with the suction side sucking on it.

Actually it wouldn't. The evap coil has liquid in most of it while a system is operating normally. Stop the air flow through the evap coil and it fills with liquid while the compressor is still "sucking" on it.

Anyway, went to just test a port on the condenser. there ain't jack squat in that system!! I mean it dumped out quick! It was working earlier this morning. There was no hint of pressure. I am really hoping the A coil is not it but I would think I would smell that 22 in the house, no? I mean refrigerant is pretty obvious in odor. I guess I did hint at some sort of almost burnt wiring smell in the back room but that could have been many things and probably my sniffer on the high and up.
Let us know where you find the leak.

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Old 07-29-2013, 04:39 PM   #17
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Copeland scroll running backwards. I am not kidding.


I am getting a little frustrated about now... I found the big leak to be the vapor side isolation valve at the condenser. Fix that. sniffed and soaped, no leak. I test filled with about 10-15oz of 134a (not running it) so I could test pressurize and sniff.

It ain;t holding. Drops about 5psi in 15min. Something is still leaking pretty good. I have the front off if the A coil and sniffed and sniffed. I would think with this much leaking, just putting a detector over the A coil would find it. I went down and back over the A coil several times, no dice.

Only place it seems to be hitting is right under the scroll comp. Not a really solid hit though and I need to know for sure.

Any bright ideas to better detect this leak? I cannot imagine the line set leaking. I also do not see any oil mess that I would expect if the scroll is leaking this bad. All that oil sitting down there, I would expect it to dump every drop of oil before pushing refrigerant. ?
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Old 07-29-2013, 04:55 PM   #18
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Need to bring up the pressure with nitrogen.

If the jug of R134A was sitting in a hot location. Then some of that pressure drop may be because the indoor coil is cooler then the area the jug was store in.
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Old 07-29-2013, 05:16 PM   #19
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You think I might be chasing my tail a bit? I put a total of about 16oz in so far. Each time, the pressure goes up and hold at about 15-20psi and gradually drops to zero. I have soaped the pee pee out of that condenser with my bug sprayer and even made a bubble mound around the base of the compressor. I cannot find a single thing leaking!

I felt pretty confident by the size of the leak at the valve that I found my culprit. I wish I could further verify the A coil but I would also think at the rate of pressure drop, I should be able to sniff something. That sniffer goes nuts over about anything and in that confined, still space in the plenum, it should show up?

Maybe I am getting my education in why N is superior for leak detection!

Last edited by viper; 07-29-2013 at 05:19 PM.
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Old 07-29-2013, 05:18 PM   #20
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If it keeps dropping to 0PSIG. Then you have a leak.

A little R22, and nitrogen at 200 PSIG finds most leaks pretty quickly.
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Old 07-29-2013, 05:22 PM   #21
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I guess I will have to see what I can buy tomorrow for a Nitrogen bottle. I agree, more pressure sounds great to find this leak. I will also add a little more and see if the pressure drops and holds but right now my money is on a leak....
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Old 07-29-2013, 05:55 PM   #22
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I'm sorry I meant Yuri. Darn autocorrect

No problem

In the old country I had small yurt. Now that I am in Canada I am rich man and have big one with vindows.
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Old 07-29-2013, 07:37 PM   #23
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It is certainly leaking. After leaving it for a couple hours, there ain't nothing in it. I decided to clamp down the iso valves to at least see which end I need to look. So far the condenser is holding perfect, as I suspected.

Is there such thing as an easy fix in the A coil? I guess I could hope for a problem in the line set but it only touches two things and both are wood studwalls.
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Old 07-29-2013, 07:46 PM   #24
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Best to find the leak, and then decide what needs to be done from there.
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Old 07-29-2013, 09:14 PM   #25
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I agree with that!

however, I am running out of ideas to find this leak. Now that it is isolated, it is clear that the leak is either in the line set or A coil. Sniffer gets a little excited working over the A coil but not dead on hit. Just cannot get to every little tube in it.

Ideas? Do I need to try and find a different sniffer? I too would like to know where my leak is before tearing anything down. Die might be an idea but I doubt I will be able to see where it is leaking if in the Acoil anyway.

This might be a good time to ask about sealers. Are they a really bad idea? From what I gathered, when they are exposed to air, they harden up. That makes me real nervous but if there is something out there, I might give it a shot if the system is otherwise shot anyway.
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Old 07-29-2013, 09:22 PM   #26
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Quote:
Originally Posted by viper
I agree with that!

however, I am running out of ideas to find this leak. Now that it is isolated, it is clear that the leak is either in the line set or A coil. Sniffer gets a little excited working over the A coil but not dead on hit. Just cannot get to every little tube in it.

Ideas? Do I need to try and find a different sniffer? I too would like to know where my leak is before tearing anything down. Die might be an idea but I doubt I will be able to see where it is leaking if in the Acoil anyway.

This might be a good time to ask about sealers. Are they a really bad idea? From what I gathered, when they are exposed to air, they harden up. That makes me real nervous but if there is something out there, I might give it a shot if the system is otherwise shot anyway.
What sniffer are u using?
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Old 07-29-2013, 11:01 PM   #27
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This is a Tiff 5500a. Probably not the best on the planet but if I can get right to the leak, it will hit. no problem but it does get several false positives. I usually reset and retest a few times to confirm. With this much leaking, I would think the whole plenum would light up...
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Old 07-30-2013, 01:17 PM   #28
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Found my leak! So frustrating. Of all things, apparently the plumbing in the crawl space leaks just a bit and was dripping right on the liquid line. ate right through it... After all the effort of getting Nitrogen, I found the leak in 2 min. After opening the crawl space, it was very obvious. I would have found it with 134 if I just looked there.

Anyway, patching it up now and will pressure test again but I feel pretty confident we got it this time.
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Old 07-31-2013, 12:52 PM   #29
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Question for everyone following this post , What lives under bridges????
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Old 07-31-2013, 01:13 PM   #30
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I hate that when that happens. Toilet leaks and eats thru the copper liquid line, Da**mn.

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