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  1. #1

    Reversing valve or what?

    Hey guys I have a system that's driving me crazy I have what you could call perfect pressures but only 72 degrees suction line temp. Unit pumps down with no problem ,no ristrictions. So I'm already at a new txv and new compressor and same problem. Unit still under warranty. Only thing I can think is reversing valve bleeding ! It's not noisy or stuck

  2. #2
    Join Date
    Feb 2012
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    If the reversing valve is bleeding by then your suction will get warmer after the valve and the hot gas will get cooler after the valve. Do you have that or did you check.

  3. #3
    About 5 degree difference on suction didn't check hot gas side. But if I manually revese from cool to heat and wait a bit and reverse it again it starts to cool for about 10 seconds but once it stabilizes back to cooling it won't drop from 72 average suction line temp

  4. #4
    Join Date
    Jul 2005
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    Quote Originally Posted by FixItRight View Post
    If the reversing valve is bleeding by then your suction will get warmer after the valve and the hot gas will get cooler after the valve. Do you have that or did you check.
    The delta between hot gas in and hot gas out will not increase.

  5. #5
    Gonna tackle it again tomorrow to see what is temp difference at R V on hot gas , thanks
    If I run itin heat the out door coil suction one won't get cold. There for its same behavior for indoor and outdoor coil. It's a Trane heat pump.

  6. #6
    Join Date
    Jul 2005
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    Quote Originally Posted by klokmiloco View Post
    Gonna tackle it again tomorrow to see what is temp difference at R V on hot gas , thanks
    If I run itin heat the out door coil suction one won't get cold. There for its same behavior for indoor and outdoor coil. It's a Trane heat pump.
    You'll be spinning your wheels. It's only the temp rise on the cold lines in and out that you need to measure. Bypassing will not cause a temperature difference across the hot lines in and out. If you pour a beer into a lake, does the can fill up with lake water? Thats an analogy. In any case, it isn't the reversing valve. When a reversing valve is bypassing suction pressure runs higher than normal. Your suction pressure is normal.

  7. #7
    Join Date
    Jul 2007
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    12
    Did you check supply air temp at furnace or look at the stat? I'm with the guy who said you might be pulling attic air. If that's not it you might pull the bulb on the TXV and see if that changes your superheat. Trane has had a lot of TXV failures.

  8. #8
    Join Date
    Jul 2007
    Posts
    12
    80# suction with a 72 line temp would be 24 degree superheat. Your not that far off. Did you leave it running? might look better after the house cools off.

  9. #9
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    what is perfect pressures and what is your superheat and subcooling?

  10. #10
    Subcoolig at 12 low side 79/80 ( 84 inside house). High side 245/250 , evaporator coil gets completely wet when panels on a/h is opened to check coil behavior. (no signs or behavior of restrictions )

  11. #11
    Join Date
    Jul 2005
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    5,153
    Quote Originally Posted by klokmiloco View Post
    Subcoolig at 12 low side 79/80 ( 84 inside house). High side 245/250 , evaporator coil gets completely wet when panels on a/h is opened to check coil behavior. (no signs or behavior of restrictions )
    Measure suction line temp at the evaporator outlet. The TXV controls superheat at that point, not at the compressor inlet.

  12. #12
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    66,804
    Was the LLFD changed out when any of the other parts were changed?

    This is R22?
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  13. #13
    Yeah r22 new filter drier new txv new compressor , same behavior with both coil if reversed from heat to cool condenser coil won't cool in heating and evap coil in cool. No ristrictions

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