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  1. #1
    Join Date
    Jul 2007
    Location
    san antonio
    Posts
    51

    Confused Trane TWA048C300A2 contactor not engaging all the way

    Heat Pump Trane TWA048C300A2

    Air Handler Trane TWE048C140B3

    When calling for cooling, I am reading 24-25 volts at condenser contactor. That should be enough to energize the contacts competely. I saw that the original contactor was pitted, so I replaced it with a new one (right one) and I am still getting almost a low voltage signal that barely engages contacts half way. I can sometimes press the contactor manually and it will stay in. Possibly a bad transformer? Anyone else got any other suggestions?

  2. #2
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,847
    Quote Originally Posted by sanantoniotech View Post
    Heat Pump Trane TWA048C300A2

    Air Handler Trane TWE048C140B3

    When calling for cooling, I am reading 24-25 volts at condenser contactor. That should be enough to energize the contacts competely. I saw that the original contactor was pitted, so I replaced it with a new one (right one) and I am still getting almost a low voltage signal that barely engages contacts half way. I can sometimes press the contactor manually and it will stay in. Possibly a bad transformer? Anyone else got any other suggestions?
    Just cuz it's a new contactor, doesn't mean it's gotta work.
    You've got the posts, apply for pro, and get more detailed answers.

  3. #3
    Join Date
    Jul 2007
    Location
    san antonio
    Posts
    51
    PROBLEM SOLVED!!!!!!!

    Wrangler...you were right, it might be new, 'but was it the right contactor.' I went and double checked to find out that a 110-120 volt coil contactor was put in a 24volt contactor box. Guess I need to read directly off the contactor from now on...Thanks everyone!

  4. #4
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,847
    Sometimes ya just gotta be smarter than the machine.
    From this day on, you'll always check the coil voltage, won't ya?

  5. #5
    Join Date
    Jun 2008
    Location
    Cincinnati, Ohio
    Posts
    2,176
    Sounds like PHB's rule (I named it myself.......)

    "You only have to be 2% smarter than whatever it is you're working on"

  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,929
    Still, apply for pro membership!

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,770
    Quote Originally Posted by BaldLoonie View Post
    Still, apply for pro membership!
    Or we'll erase your memory, or this thread.
    Contractor locator map

    How-to-apply-for-Professional

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

  8. #8
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,847
    Quote Originally Posted by beenthere View Post
    Or we'll erase your memory, or this thread.


    Or both.

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