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Thread: Trane chiller

  1. #1
    Join Date
    Oct 2006
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    Trane chiller

    Hello everyone I am working on a RTAA170GYR01A3C0BN When circuit A tries to start it transitions the run contactor comes on it runs for almost a minute then it shuts off and gives me a code of 180 the code says starter transition does that mean the aux. contact on the side of the run contactor is bad or something else. I got rained out before I could check anything.

  2. #2
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    Ok .I think you need to answer yourself a question.
    Clearly you are working on a wye-delta starter .
    Do I fully understand the working sequence and principal of a wye-delta starter ?
    If the answer is no , then you should get direct help from someone who does .
    Dont go poking your fingers and tools into something you dont understand .
    Wye-delta is dangerous stuff and needs to be treated accordingly , in the wrong hands things go bang and people get hurt .
    I'm not trying to doubt you its just clear from your post that you should be asking for more help than can be give here .
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  3. #3
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    Dec 2008
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    UCM didn't get the transition complete input within 6 seconds after the call to transition.

  4. #4
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    Like Graham said, it helps if you're familiar with the transition sequence, but if it is running for a minute after it appears to make transition then it probably is an auxilliary contact making intermittant contact. On the compressor module check the transition complete input at J3-3 and J3-4 to see if it opens when the chiller trips. Use an analog meter, because it may happen too fast to see with a digital.
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  5. #5
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    When I got to the job this morning without the rain I found 4 bad fan motors on this circuit after I replaced them it started up and ran fine.

  6. #6
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    I have seen this fault turn out to be poor pin connections at the board.
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  7. #7
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    Sep 2007
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    Quote Originally Posted by dmdrone View Post
    When I got to the job this morning without the rain I found 4 bad fan motors on this circuit after I replaced them it started up and ran fine.
    4 bad condenser motors have nothing to do with starter transition problems, I do belive the problem was the auxiliary relay on the run contactor but if you didn't fix it I'll not be surpriced to have this diagnostic again soon.
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  8. #8
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    Jun 2009
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    Quote Originally Posted by Manu1 View Post
    4 bad condenser motors have nothing to do with starter transition problems, I do belive the problem was the auxiliary relay on the run contactor but if you didn't fix it I'll not be surpriced to have this diagnostic again soon.
    I agree. Transition faults tend to be transient and intermittent, gradually increasing in frequency as time goes on. I'd go ahead and swap out the aux switch just to eliminate it as a possible cause since they are relatively cheap. When I used to do a lot of start ups on RTAAs, Trane would ship X-line starters with aux switches on them. I would pull them off and save them since they weren't there for any reason. That way when I wanted to change a switch if I suspected it was going bad, I could without having to buy one. I changed out a lot of them over the years, especially on older equipment where the bakelite was brittle and they had been subjected to a lot of vibration from a buzzing starter. Also, whenever I had to change a start or run contactor or put a new frame and armature in one, I would put new switches on it.
    Low Pressure Forever!

    If you know heavy metal, you can work anywhere-Dave Andreson

    Anchors Aweigh my boys, Anchors Aweigh!
    Farewell to foreign shores, We sail at break of day. Through our last night on shore, Drink to the foam. Until we meet once more. Here's wishing you a happy voyage home!

  9. #9
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    Agree w/everyone whose posted, got to be something in the hardware. Have you broke down the starter checked the coil for any cracks? I've seen it where the coil will get too hot & break down the magnetic field, contacts may still be made, but it could hicup the aux. on the k2 run starter. How many starts does this chiller range per day? Did you get a bunch nuissance trips due to the fan motors? Hope this can help.
    Sic Semper Tyrannis.

  10. #10
    Join Date
    Oct 2006
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    57
    I dont see any cracks on the contactor I talked the owner to let me replace the aux contacts What operates the fans I noticed they dont cycle at the same pressures every time Thanks for all yalls help

  11. #11
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    Oct 2006
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    Not to doubt you, but did you break the contactor down, pull the coil & check it? Auxillarys are prime culprits for transition failures, the N.O. aux on K2 run starter, could be your suspect. The fans are staged by temp. drop across exv saturated condenser temp - saturated evap. temp. 75* +(-) 5* In a nutshell.
    Sic Semper Tyrannis.

  12. #12
    Join Date
    Sep 2008
    Location
    Texas
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    371
    The transitiion complete contacts are made with gold! Different from all the other contacts. You must get them from Trane or you will have problems. You could swap the like aux on the other circuit and see if the problem moves. Good luck!
    "Dying aint much, its living thats hard." (Josey Whales)

  13. #13
    Join Date
    Nov 2009
    Location
    Aptos, Ca
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    40

    Wye-Delta transistion diagnostic

    For fun you could disconnect main power from the chiller and manually play with the starter. Use an external control power source with some toggle switches to manually operate the starter contactors from starting/shorting to transistion/run. You can safely meter all points in slow motion with no high voltage. Broken flux sucking shunt?

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