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    billyboyfeb's Avatar
    billyboyfeb Posts: 4, Reputation: 1
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    #1

    May 27, 2008, 12:08 PM
    Am I overcharging AC or defective TXV?
    Fired up my 5 ton Carrier AC. Low side showed 50 PSI for a couple of hours then drops to 15-20 PSI. Assume freeze-up.

    Defrost

    Today I start adding R-22 (slowly). For the longest it never went above 55 PSI. After about an hour at 55 PSI it would jump to 75 PSI & slowly descend back to 50 PSI. Stopped adding R-22.

    Shut unit off for about an hour. Restarted and low side shows 75 PSI. Slowly drops to about 65 PSI. VERY Confusing. Connect gauges to high side. Gage jumps to 300 Psi and SLOWLY climbs to 400 PSI. However low side barely changes. Indoor air around 75 Degrees.

    That is where I am now. THANKS for any replies.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 27, 2008, 12:26 PM
    Sounds like non condensibles in system. Contact someone with a EPA certificate to perform work with R-22.
    billyboyfeb's Avatar
    billyboyfeb Posts: 4, Reputation: 1
    New Member
    		  
    #3

    May 27, 2008, 12:36 PM
    Quote Originally Posted by hvac1000
    Sounds like non condensibles in system. Contact someone with a EPA certificate to perform work with R-22.
    How can that be? The system has been working fine for about 3 years with no problem. Where would it get non condensibles?
    Thanks
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    May 27, 2008, 12:54 PM
    Any thing can happen. Contact a professional to have your system serviced. It could be a valve but TXV's do not go bad very often. There are many other possibilities.
    Dirty indoor coil.
    Dirty filter.
    Floater in system (Dirt). It can break loose any time.
    billyboyfeb's Avatar
    billyboyfeb Posts: 4, Reputation: 1
    New Member
    		  
    #5

    May 27, 2008, 12:55 PM
    Quote Originally Posted by hvac1000
    Sounds like non condensibles in system. Contact someone with a EPA certificate to perform work with R-22.
    Also could it be an overcharge combined with a bad TXV? It does have an inline filter in the High side which should trap floaters. I guess that it could also be clogged.
    Thanks.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #6

    May 27, 2008, 12:57 PM
    Anything is possible.
    billyboyfeb's Avatar
    billyboyfeb Posts: 4, Reputation: 1
    New Member
    		  
    #7

    May 27, 2008, 01:11 PM
    Quote Originally Posted by hvac1000
    anything is possible.
    Runtime Pressure Chart
    Min:Seconds Low Side High Side
    0:30 85 300
    1:00 74 290
    1:30 72 280
    2:00 70 285
    2:30 70 310
    3:00 69 340
    3:30 68 325
    4:00 68 330
    4:30 68 360
    5:00 68 370
    5:30 68 375
    6:00 68 385

    Got scared. Shut down unit
    Sorry to be such a pain in the A, but there is only 1 AC serviceman within 30 miles (Rural Texas) & I know that he will take advantage of his mother or anyone else. If I have enough knowledge, maybe I can keep him halfway honest.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #8

    May 27, 2008, 02:24 PM
    Sounds like the area need more qualified service persons. Good luck.
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