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Thread: subcooling

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  1. #1
    Join Date
    Feb 2005
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    102
    what do you do subcooling or superheat inheat mode of a heat pump

  2. #2
    Join Date
    Apr 2003
    Location
    the Great Pacific Northwest
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    607
    TXV or other

  3. #3
    Join Date
    Feb 2005
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    102
    orifice

  4. #4
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    Feb 2005
    Location
    Dothan, Al
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    3,453
    Subcooling, by my Tempstar manual

  5. #5
    Join Date
    Apr 2003
    Location
    the Great Pacific Northwest
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    Superheat, follow charging chart.

  6. #6
    Join Date
    Feb 2005
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    102
    any range tht you go by for subcooling ??

  7. #7
    Join Date
    Feb 2005
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    how acurate would that superheat reading be with the evap outside

  8. #8
    Join Date
    Apr 2003
    Location
    the Great Pacific Northwest
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    Heat pump systems don't have evaps, they have indoor and outdoor coils. the function changes depending on the mode of operation.

  9. #9
    [QUOTE]Originally posted by hvac-tech-lane
    [B]Heat pump systems don't have evaps, they have indoor and outdoor coils. the function changes depending on the mode of operation.







    Misleading.
    Heat pump systems have evaps and condensers and depending upon mode of operation, the evap will be located either indoors or outdoors.

  10. #10
    Join Date
    Jun 2005
    Location
    Clearwater,FL.
    Posts
    34
    in the heating mode, you weigh it in & follow the performance chart.set SH & SC in cool mode only, above 65 degrees od temp for the most accurate charge.

  11. #11
    You cannot weigh in an existing charge unless you recover it and recharge system plus calculate for lineset length.
    Manufacturer charging charts are usually on board unit cabinet.
    126 degree above ambient method on hot gas line is the better way to check charge in heating season.

  12. #12

    Wink

    126 degrees above ambient @ compressor discharge for R-22 only.

    [Edited by chillbilly on 06-26-2005 at 11:17 AM]

  13. #13
    Join Date
    Apr 2003
    Location
    the Great Pacific Northwest
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    607
    Originally posted by hvac-tech-lane
    Heat pump systems don't have evaps, they have indoor and outdoor coils. the function changes depending on the mode of operation.
    Originally posted by chillbilly
    Misleading.
    Heat pump systems have evaps and condensers and depending upon mode of operation, the evap will be located either indoors or outdoors.
    Re read my post please, there is nothing misleading. proper nomenclature for heat pump system coils is : indoor and outdoor coils to designate the actual location in a standard split system, the function changes depending on the mode of operation.
    Originally posted by chillbilly
    You cannot weigh in an existing charge unless you recover it and recharge system plus calculate for lineset length.
    Manufacturer charging charts are usually on board unit cabinet.
    126 degree above ambient method on hot gas line is the better way to check charge in heating season.
    Originally posted by chillbilly
    126 degrees above ambient @ compressor discharge for R-22 only.

    [Edited by chillbilly on 06-26-2005 at 11:17 AM]
    I don't recall reading this method in any manufacturers instructions could you point me to the documentation where this info is?

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