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  1. #1
    Join Date
    May 2008
    Posts
    17

    liquid line temperature

    I just got my certification and I am still learning the trade. How hot can a liqiud line get on a hot day. If its 98 degrees outside.

  2. #2
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,122
    Pretty hot, I would say if it's coffee cup hot the charge is pretty close.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  3. #3
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,795
    Also depends on the indoor conditions.

    A high indoor load will increase it.
    Condition of outdoor coil, etc.
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    How-to-apply-for-Professional

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

  4. #4
    Join Date
    May 2008
    Posts
    17
    inside temperature is 75 degree and outside temp. is 98 degree. the line temp. is 124 at the evaporator.

  5. #5
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,122
    Quote Originally Posted by sondown View Post
    inside temperature is 75 degree and outside temp. is 98 degree. the line temp. is 124 at the evaporator.

    That should be about a 300 psi liquid line pressure.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  6. #6
    Join Date
    May 2008
    Posts
    17
    Everything I have read anything over 275 head pressure is a problem. Is this true.

  7. #7
    Join Date
    Apr 2008
    Location
    Southern New Hampshire (USA)
    Posts
    401
    Quote Originally Posted by sondown View Post
    Everything I have read anything over 275 head pressure is a problem. Is this true.

    Depends on the system.... generally on the older systems, you were looking for a condensing temp about 30* higher than ambient... which at times will get you over 300. Newer high efficiency systems are different.

  8. #8
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,795
    Dirty condenser coils will do that too.
    Contractor locator map

    How-to-apply-for-Professional

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

  9. #9
    Join Date
    Jan 2007
    Location
    N.E. Ok.
    Posts
    1,376
    Quote Originally Posted by Mr Bill View Post
    Pretty hot, I would say if it's coffee cup hot the charge is pretty close.
    Beer can cold and coffee cup hot, i knew there was something i could be doing with my free hand

  10. #10
    Join Date
    May 2008
    Posts
    17
    Thanks for all the information. I was afraid the temperature and head pressure was to hi. That the compressor was getting to hot and would lock up/ burn out.

    I cleaned the condenser with a condenser cleaner and water.

    The system is 15yrs old.

  11. #11
    Join Date
    Apr 2008
    Location
    Southern New Hampshire (USA)
    Posts
    401
    Don't worry... if it does, you'll be the first one they call! (unless it's your system, then you'll still be the first to know!)

  12. #12
    Join Date
    May 2008
    Location
    Meridian, MS
    Posts
    390

    liquid line temp

    Quote Originally Posted by beenthere View Post
    Dirty condenser coils will do that too.
    if a filter dryer is clogged would the line be hotter coming from the condenser and colder on the evap side and would it cause high head pressure? by the way, i changed my signature from tonydykes55 to apprentice because the more i read the less i realize i know
    td55

  13. #13
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    Quote Originally Posted by captube View Post
    Beer can cold and coffee cup hot, i knew there was something i could be doing with my free hand
    No, the proper terminology would be.....

    I knew there was something DIFFERENT I could be doing with my free hand

    Watering the flowers was very nice of you. But now its time to put away your hose and get back to work.
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

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