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  1. #1
    Join Date
    Apr 2007
    Location
    Phoenix AZ
    Posts
    89

    Confused sweating suction line

    what cause a sweating suction line in a split system?

    my suction pressure was 68 psi and my high was 224 psi .

    Can it be undercharged or overcharged?

    dirty indoor coil?


    pls help

    thanks

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,087
    Most of the time it is below the dewpoint and will sweat. That's why the insulation is on it.

  3. #3
    Join Date
    May 2008
    Location
    newnan,ga
    Posts
    57
    Is the suction line insulated?

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    What baldie said.
    Its normal.

    Remove those guages, and step away from the unit.
    Checking the charge is not a DIY thing.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    May 2008
    Location
    The People's Republic of Massachusetts
    Posts
    91
    A suction line will sweat is can even have ice and be OK. As long as the ice goes no farther than the end bell on the compressor it is nothing to really worry about. A little frost on the end bell is just good subcooling for the compressor.

  6. #6
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    Quote Originally Posted by maints View Post
    A suction line will sweat it can even have ice and be OK. As long as the ice goes no farther than the end bell on the compressor it is nothing to really worry about. A little frost on the end bell is just good subcooling for the compressor.

    must be a maintanance guy thing



    .

  7. #7
    Join Date
    Apr 2007
    Location
    Phoenix AZ
    Posts
    89
    Quote Originally Posted by Airmechanical View Post
    must be a maintanance guy thing



    .


    you must be a comedian on the weekend

  8. #8
    Join Date
    Apr 2007
    Location
    Phoenix AZ
    Posts
    89
    thanks all!

  9. #9

    Talking

    you're unit is working like its supposed to put those gauges on ebay!

  10. #10
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,975
    If an uninsulated suction line is below the Outdoor Ambient Temp (OAT) dew point it will condense moisture. Of course, the OAT dew point can vary a great deal; just ignore the sweating issue. (Where is the insulation?)

    Forget about a sweating suction line, it is NOT an indication of an incorrect charged system.

    Get the airflow right & the Superheat & Subcooling within specifications.

  11. #11
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,707
    If suction didn`t sweat you wouldn`t need a drain pan.

  12. #12
    Join Date
    Mar 2008
    Location
    20141
    Posts
    1,152
    Quote Originally Posted by menaphnx View Post
    what cause a sweating suction line in a split system?

    my suction pressure was 68 psi and my high was 224 psi .

    Can it be undercharged or overcharged?

    dirty indoor coil?


    pls help

    thanks
    In my opinion you've left out quite a bit of important information. Whats you indoor metering device (this determines the method for verifying correct refrigerant charge)? Once you've determined method for checking charge, what is the required superheat or subcooling. What are you indoor and outdoor temps (wetbulb and drybulb)? The past few days where I am its been very cool for august (79 degrees high temp) and very dry. I've had 53 degree suction lines that aren't sweating simply because with the low temp and humidity they suction lines are above the dew point.

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