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  1. #1
    Join Date
    Apr 2011
    Location
    Canada
    Posts
    3

    Confused Need advice on Reverse valve problem

    I have a xp15 4 ton lennox heat pump that i'm working on and it's totally fine when in cooling but when i put it in heating my low side drops down and hovers around 50-58psi while the high side is up between 300-320psi. Ambient was around 10 degrees F. On the reverse valve the top discharge pipe is around 150 degrees F and the suction line heading to the indoor coil is around 130 degrees F and the other pipes are around 0-6 degrees F. I think the slider isn't sliding over all the way when in heating, i've tried tapping it with a hammer as well as energizing and de-energizing "O" to loosen the slider, but nothing seems to be working. Does anybody have any advice on whats going on? Thanks

  2. #2
    Join Date
    Apr 2010
    Location
    Minnesota
    Posts
    515
    I think your RV is fine.

  3. #3
    Join Date
    Jul 2001
    Location
    maryland
    Posts
    1,355
    So what's the problem again?
    Saving the world...one service call at a time.

  4. #4
    Join Date
    Oct 2005
    Location
    Pacific Northwest
    Posts
    2,266
    Quote Originally Posted by dunkman View Post
    I think your RV is fine.
    Or "was" fine....

  5. #5
    Join Date
    Apr 2010
    Location
    Minnesota
    Posts
    515
    Don't hit it with a hammer any more.

    Seriously though, what were you called there for?

  6. #6
    Join Date
    Oct 2005
    Location
    Pacific Northwest
    Posts
    2,266
    .

  7. #7
    Join Date
    Apr 2011
    Location
    Canada
    Posts
    3
    Quote Originally Posted by dunkman View Post
    Don't hit it with a hammer any more.

    Seriously though, what were you called there for?
    I was called out there because the compressor was locked out on low pressre, it's a R 410 system and the pressure switch trips when it would drop below 25 psi.. when in heat mode my pressures should be around 100psi or so low side and 300psi or so in high side.. the temp between the the discharge port of the reverse valve and the suction pipe leading to the indoor coil is about 20 degree F difference, shouldn't they be roughly the same temp if the valve is functioning properly...What would you suggest might be the problem?

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,755
    Follow the instructions in the below thread, and read the second thread.

    http://hvac-talk.com/vbb/showthread.php?threadid=116113

    http://hvac-talk.com/vbb/showthread.php?threadid=1241
    Contractor locator map

    How-to-apply-for-Professional

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

  9. #9
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    Quote Originally Posted by beenthere View Post
    Follow the instructions in the below thread, and read the second thread.

    http://hvac-talk.com/vbb/showthread.php?threadid=116113

    http://hvac-talk.com/vbb/showthread.php?threadid=1241


    i was going to ask if it was a 410A, but since that info has a finally been divulged, all i can add is What possessed you to hit it with a hammer?
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  10. #10
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,614
    you need to call your service manager and ask for some training on heat pumps

  11. #11
    Join Date
    Jul 2006
    Posts
    1,091
    A reversing valve got me the other day

  12. #12
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,292
    You may have buggered an otherwise perfectly fine reversing valve by hitting it with a hammer.

    I think your problem is elsewhere, but now the RV might be added into the mix, furthermore adding insult to injury.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  13. #13
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,755
    sneakr76.

    If you think your vapor pressure on a R410A system should be around 100 PSIG in heat mode at a 10°F ambient. You need to take some courses on heat pumps.
    Contractor locator map

    How-to-apply-for-Professional

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

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