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  1. #1
    Join Date
    Aug 2005
    Posts
    22

    Mismatched Split Units

    I am at my whits end trying to get an answer to these mismatched units! I have a Goodman 3 ton heat pump M#GSH130361BB 13 seir condensing unit, Matched up with an American Standard Air Handler M# TWG036A140B1 3 Ton, (1998 air handler) and replaced the evaporator Accumulator it was leaking, Leak checked and pulled an 480 micron vacume, started charging the unit and the head pressure went over 350 psi., cleaned the condenser coil, the head pressure then dropped to 190 psi., finished charging the unit, checked the drop across across the drier, no temperature change, I have a 70 psi. suction, 230 discharge, and 14 degree superheat, In the conditioned space in this office building return is at 79 degrees and supply air is at 69 degrees, I am thinkin this customer needs a new Goodman 13 Seir Air Handler, Any help will be greatly appreciated , Thanks, Twinpop Winston-Salem N.C.

  2. #2
    Join Date
    Aug 2001
    Location
    Mechanicsville, Virginia
    Posts
    1,109
    I can help, but I need more readings, what was the OD temp? The indoor wet bulb? The liquid line temp or subcooling?

    Should I assume a fixed orifice or does it have a TXV?

    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

  3. #3
    Join Date
    Aug 2005
    Posts
    22
    It has a fixed orfice and 16 20 degrees superheat

  4. #4
    Good descritions!..it sounds to me like your real close to being as good as it gets. You still may be slightly undercharged due to a slightly higher superheat ( 8-12 Degrees " rule of thumb method") try adding some more refrigerant to get superheat down and you should get a better Td across evap coil. Are you taking temps at plenums on air handler or at the vents?

  5. #5
    Join Date
    Aug 2005
    Posts
    22
    I has a fixed orfice and 20 degrees subcooling

  6. #6
    Join Date
    Aug 2001
    Location
    Mechanicsville, Virginia
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    1,109
    OK 20 subcooling what about ODDB and IDWB?

    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

  7. #7
    Join Date
    Aug 2005
    Posts
    22
    Taking temperature readings at the vents supply and return

  8. #8
    Join Date
    Aug 2005
    Posts
    22
    Out door temp at 82 degrees

  9. #9
    Join Date
    Aug 2001
    Location
    Mechanicsville, Virginia
    Posts
    1,109
    Just need indoor wet bulb, if you don't have that, do you know what the indoor humidity was?

    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

  10. #10
    Join Date
    Aug 2001
    Location
    Mechanicsville, Virginia
    Posts
    1,109
    Only one temperature away from a diagnosis!.........

    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

  11. #11
    Join Date
    Aug 2005
    Posts
    22
    Just guessing maybe around 68 percent ?

  12. #12
    Join Date
    Aug 2001
    Location
    Mechanicsville, Virginia
    Posts
    1,109
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    Measuring at the air handler and getting the actual id wet bulb may change to diagnosis

    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

  13. #13
    Join Date
    Aug 2001
    Location
    Mechanicsville, Virginia
    Posts
    1,109
    Changing the SEER rating changes things also. Putting it in as 13 SEER reveals that the condenser may need another cleaning, The ones with the tight fin spacing always do.
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    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

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