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Old 08-11-2011, 02:50 PM   #16
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Perplexing AC issue


The out of phase comment, I think, refers to charging 410 as vapor and not liquid.
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Old 08-11-2011, 04:22 PM   #17
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Perplexing AC issue


I called my realtor who put me in touch with a company, on scene now. More cha-ching $$. I ran them through the drama over the phone as I'm 105 miles away at work. Here is the latest from guys who actually listened to me and took time to investigate. System comes on fine. Pressure tests good, churns out 64 degree air. Runs fine for maybe 15 minutes, then pressure starts bouncing all over the place - up, down every which way but steady. They are narrowing in on a TXV - thermal expansion valve? (...ehhh, I've never heard of one...but nor am I an HVAC girl!) Tech wants his theory validated, they are coming back tomorrow with a senior tech (no charge to me!) to review the system and findings. If it is the TXV, they will look into part availability and getting it under warranty for me. Wouldn't that be nice?
Thanks to all the DIY'ers for input and validating my concerns that, in the words of Apollo 13, 'Houston we got a problem'.
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Old 08-11-2011, 04:32 PM   #18
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Perplexing AC issue


Faulty TX valve is possible.
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Old 08-11-2011, 06:39 PM   #19
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Perplexing AC issue


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Originally Posted by yuri View Post
Faulty TX valve is possible.
Or contaminates/non condensables in the system that are taking a little time to cause the readings to jump.
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Old 08-11-2011, 06:42 PM   #20
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Perplexing AC issue


I was thinking along the lines of fractionalization, as the op said it was a leaker. Check for negative superheat!
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Old 08-11-2011, 09:47 PM   #21
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Perplexing AC issue


good thing you're getting a senior tech out there, sounds like root cause of problem is being narrowed down since they took the time to listen to you
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Old 08-17-2011, 12:42 PM   #22
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Perplexing AC issue


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Originally Posted by beenthere View Post
Or contaminates/non condensables in the system that are taking a little time to cause the readings to jump.
Hopefully my woes have been resolved. The TX valve was replaced. I would call sand a 'contaminate' or 'non-condensable' - how bout you? The system was fully drained, flushed, new valve, re-filled and checked. In addition to the valve, Mr. Sr. Tech informed me the insulation coming off plenum is subpar. Should be r-8, I basically have bubble wrap. In his words - 'when we get this puppy running cold, she's gonna sweat like a pig.' The ductwork has numerous air leaks, the attic unit is shimmed up with sheetrock and when they shimmed it, they torqued the unit so now the cover doesn't seat properly creating even more leakage. Just more stuff to fix.

But it's back together, I will be monitoring it closely over the weekend. Avalon is not a happy girl. Original installers and incompetent service company will hear from me.

I have a new service company! I try to support my local small business when possible, but after 3 strikes, yer outta here.
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Old 08-17-2011, 06:49 PM   #23
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Perplexing AC issue


Yep, Sand is a contaminate.

Glad to hear they got it working for you.
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