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  1. #27
    Join Date
    Jul 2012
    Location
    Athens, GA.
    Posts
    143
    Quote Originally Posted by jpsmith1cm View Post
    Saturated Suction Temp
    Saturated Condensing Temp
    Thank you

    JASON sent this from his DUMB-PHONE

  2. #28
    Join Date
    Nov 2011
    Location
    USA
    Posts
    365
    Quote Originally Posted by ultitech View Post
    got a 12yr old lennox split system 2 1/2 ton. A-coil will only get half way cold.

    ..recharged with r-22. pressures are perfect, about 80 low and 225 high but no matter how much more freon i put in the pressures keep going up but the line set temp wont come down, stuck at about 80 degs.

    ..it was running about 325 on high side before i replaced the dryer and was causing the compressor to over heat and shut off but still the a-coil will not flood with freon and will only give me a 10 deg temp drop across the coil.
    I doubt the 325 head pressure by itself, would have caused the compressor to overheat (unless the outdoor coil was restricted), so the superheat was probably high initially. And the fact the head was high could suggest someone before you had overcharged the system, in an attempt to get the superheat lower.

    If additional refrigerant raises pressures but doesn't decrease superheat, I'm thinking distributor tube restriction, which is a thin theory. But I've never seen an unrestricted fixed metering system that wouldn't eventually load up the coil, if you add enough refrigerant.

    Disable the blower motor with the condenser running and see how the coil loading goes.

  3. #29
    Join Date
    Jul 2012
    Location
    Athens, GA.
    Posts
    143
    So, what did you have to do to fix it?

    JASON sent this from his DUMB-PHONE

  4. #30
    Join Date
    Nov 2010
    Location
    N. Idaho
    Posts
    586
    Quote Originally Posted by TriplePoint View Post
    So, what did you have to do to fix it?

    JASON sent this from his DUMB-PHONE
    Over a month later, we may never know!

    When ever we have an issue with our Bryant equipment and I call tech support, I be sure and let him know of the outcome when it gets fixed.

    And I've even gotten better with giving him all the info!
    "I've got my Gas Mechanics license"
    "Yea, well my 16yr old daughter has her drivers license, doesn't mean she knows how to drive"

  5. #31
    Join Date
    Jul 2012
    Location
    Athens, GA.
    Posts
    143
    Quote Originally Posted by Damien View Post
    Over a month later, we may never know!
    Its coming up on a week since the first post.


    JASON sent this from his DUMB-PHONE

  6. #32
    Join Date
    Jul 2012
    Location
    Baton Rouge Louisiana
    Posts
    175
    Quote Originally Posted by pacnw View Post
    I will say air flow is MOST DEFINITELY something to check.

    Had an almost same situation today, low TD, low pressures, warm coil, SH & SC off and they wanted on one of our maintenance policies.

    Mind you, this unit was installed as a package with a furnace in 1995 by others. We have serviced the furnace since 2002, but only replace the capacitor in the outdoor unit and nothing else done according to the service sticker.

    Well it was a 75K furnace with a 1.5T a/c with blower tap for cooling on high.

    I found an old invoice with a reading of 11555 CFM, 50/120 PSIG, 74° AMB and a
    16° TD. This was also after he added a LB of refrig because he replaced the core due to a leak( maybe low pressures due to improper, too much, airflow?).

    Duct work is spotty at best.

    Lowered to heat tap, which was 752 CFM, lowest possible, got a 16° TD, but it is, was and will always be WRONG!!!

    So YES airflow matters!!!!!!!
    How would I go about measuring actual air flow/cfm?

  7. #33
    Join Date
    Nov 2010
    Location
    N. Idaho
    Posts
    586
    Quote Originally Posted by TriplePoint View Post
    Its coming up on a week since the first post.


    JASON sent this from his DUMB-PHONE
    Some reason I was thinking it was the end of Aug.

    Been a long day, staring at to many numbers lately!!
    "I've got my Gas Mechanics license"
    "Yea, well my 16yr old daughter has her drivers license, doesn't mean she knows how to drive"

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