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Thread: Rheem Heat Pump

  1. #1
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    Rheem Heat Pump

    New Rheem heat pump been installed for a few months and customers states that hammering noise is periodically coming from air handler. In heat mode the pressures are 240 suction and 230 head. Suction temp is 114 and LL temp is 78. It was a 65 degree day today and in cooling mode the pressures were 135 head and 47 suction. There was frost starting to build up at the txv on condenser. Im thinking there are non condensibles in the system so purge system, replace txv and LL drier, weight in factory charge and see what that does. Any other suggestions?

  2. #2
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    Mar 2019
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    It sounds low on charge . In the heating mode I’m guessing you just had your manifold hooked up in the standard cooling configuration. Low side hooked up to the suction line and the red hose hooked up to the liquid line . In heating you should hook the manifold with the blue hose to the true suction and your red hose to the discharge line which in cooling is your suction line .

  3. #3
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    Not sure about the hammering but it sounds low on charge to me...


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  5. #4
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    240 PSI for 410A is roughly 80 degrees Fahrenheit..

    Your suction temp is 113 degrees?

    Something ain't right

    I'm with the low on charge assumption

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  6. #5
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    Quote Originally Posted by FreeThrowGuy View Post
    240 PSI for 410A is roughly 80 degrees Fahrenheit..

    Your suction temp is 113 degrees?

    Something ain't right

    I'm with the low on charge assumption

    Sent from my LM-G710VM using Tapatalk
    Numbers look like R-22.

    Wonder if just the outdoor was replaced.

    Matched system?
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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  7. #6
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    Quote Originally Posted by joemach View Post
    Numbers look like R-22.

    Wonder if just the outdoor was replaced.

    Matched system?
    And it ain't cooling either

  8. #7
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    Quote Originally Posted by Mr. Nobody View Post
    New Rheem heat pump been installed for a few months and customers states that hammering noise is periodically coming from air handler. In heat mode the pressures are 240 suction and 230 head. Suction temp is 114 and LL temp is 78. It was a 65 degree day today and in cooling mode the pressures were 135 head and 47 suction. There was frost starting to build up at the txv on condenser. I’m thinking there are non condensibles in the system so purge system, replace txv and LL drier, weight in factory charge and see what that does. Any other suggestions?
    In heat mode, the large line is not a suction line. Its a high pressure hot gas line. You need to connect your manifold to the true suction port to read the suction pressure.

    If you connect your manifold to the true suction and liquid line, I think you'll see that it shows as a low charge in both heating and cooling mode.

    You can also recover and weigh how much charge was in the system. To see if its low on charge, or another problem.

    Would hate to have you replace the TXV and LLFD and then a few months or a year or two down the road, have the same problem because it was a leak problem.
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  9. #8
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    I am wondering if both the indoor and outdoor units were replaced, and if someone actually had this working right from day one. Let us know what you find.
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  10. #9
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    Sep 2007
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    Model an serial numbers on all, plus a a little more diagnostic info is in order first.
    UA Local 32 retired as of Jan 2020

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