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  1. #1

    Confused carrier infinity problem

    I had a service call were a 5 ton carrier 2 stage infinity system was giving me a possible evaporator frozen code at the thermostat? i checked the charge it was good checked for leaks no leaks? txv bulb was installedin the right place filters were clean the i went under the house its a downflow system. the plenum has 3 -10" supply ducts and 1- 8".the return is 16" is the ductwork undersize for a 5 ton system?or is the infinity thermostat bad this is my 2nd time back to this house im kind of stumped.

  2. #2
    Join Date
    May 2004
    Posts
    538
    Your right 16" is too small. But its a 2 stage unit, run it on the first stage by setting the t-stat 1 degree under the room temp.

    I would measure the ESP, I have a digital meter that makes it easy, but the old dwyer magnehelics work too.

    Did you measure 12 degrees of subcool on the liquid line?

    Supply ducts size seem fine.

  3. #3
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,665
    you can go into the tstat setup and run a static pressure test. yes a 16inch flex is not enough for 5 tons you need 2 16 inch flexes and each filter grill should be at least a 20 x30 i think your also short on supply ducts also

  4. #4
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Ductwork is way undersized on both supply and return...
    How tall are you Private???!!!!

  5. #5
    Subcooling was 11 degrees and I checked that I didn't check static pressure but it sounds like the duct work is undersized huh what sucks is my company installed this system before my time so now I got to tell the boss that their ductwork is undersized

  6. #6
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    You're lucky to be moving 1/2 the cfm's needed.

    I'm surprised to static pressure alert isn't going off every single night...
    How tall are you Private???!!!!

  7. #7
    That's why the evaporator is freezing up not enough cfm going past the coil

  8. #8
    Join Date
    Jan 2008
    Posts
    2,029
    Don't see many Infinity controls here, and as others have stated, not nearly enough duct for 5 tons.
    I ran into this problem once, (I think it was an infinity), and the stat was set-up incorrectly, which caused some freezing under certain conditions.
    I can't quite remember the actual settings, but I believe it was setup to de-humidify, which slowed the blower, and caused the freezing. Get some help from tech support, after you fix the ducts.
    "Hey Lama, hey, how about a little something, you know, for the effort." And he says, "there won't be any money, but when you die, on your deathbed, you will receive total consciousness." So I got that goin' for me, which is nice. - Carl Spackler

  9. #9
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,126
    What is the evaporating temp?

  10. #10
    How do you find the evaporating temperature ?

  11. #11
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,126
    Quote Originally Posted by williediesel View Post
    How do you find the evaporating temperature ?
    Are you a tech? That is a pretty basic measurement. That and sh will tell you if airflow is low.

    Apply for pro and we can go into detail how to take those readings.

  12. #12

    Confused

    I'm a service tech with Sheetmetal worker local 104 san francisco bay area I could put my thermocouple in the evaporator but would that give me the evaporator temperature or are you asking actual saturation temperature at the evaporator ?

  13. #13
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,126
    Quote Originally Posted by williediesel View Post
    I'm a service tech with Sheetmetal worker local 104 san francisco bay area I could put my thermocouple in the evaporator but would that give me the evaporator temperature or are you asking actual saturation temperature at the evaporator ?
    Yes, suction pressure converted to saturation temp equals evaporation temperature, or SST.

    One more post and you can apply for pro.

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