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  1. #1
    Join Date
    May 2007
    Posts
    164

    Trane xl14i bad fan motor on condenser unit?

    Had tech onsite for a strange harmonic/noise issue. Bad bearing type sound but also very similar to when my king valve wouldn't fully open and needed to be replaced day1.

    Tech hopefully has isolated problem to fan motor which hopefully will get installed tomorrow. I say hopefully as tech's readings/numbers don't indicate any obvious defect and it's sad as unit is just under a year old.

    HOW COMMON IS THIS WITH TRANE? Sure glad I got the 10 yr labor warranty along with the parts piece.

    Longer version is I have 2 xl14i's w/r22 which sit next to one another--both just under 1 yr old. (near my computer office so I end up hearing them run)

    Both have be running pretty well but all of a sudden unit #1 makes high pitch harmonic noises during times of little to no load for only 1st 5 minutes. ( morning & evening hours ) Unit #2 makes no such noises.

    Problem unit does not make any unusual noises during the heat of the day and noise goes away often after about 5 minutes but longer now that its been 75F in the a.m. vs 90F.

  2. #2
    Join Date
    Nov 2000
    Posts
    1,251

    Sometimes sounds are hard to locate.

    But it sounds (no pun intended) like your tech is on top of it. All motors can sometimes make strange sounds when their bearings start to go. I can remember a lady that swore she had a bird making a noise in her's. Let him change it out and see if that fixes it.
    "You do not merely want to be considered just the best of the best. You want to be considered the only ones who do what you do.".... Jerry Garcia
    "You just have to decide if you're a Tigger or an Eeyore,..I think you know where I stand on the great Tigger/Eeyore debate." Prof. Randy Pausch

  3. #3
    Join Date
    May 2007
    Posts
    164
    Yeah I've had bearing issues/noises from bad pool motors & w/automobiles.

    Just surprised it lasted an entire summer running tons but then it's only 11 months old.
    Quote Originally Posted by lbf View Post
    But it sounds (no pun intended) like your tech is on top of it. All motors can sometimes make strange sounds when their bearings start to go. I can remember a lady that swore she had a bird making a noise in her's. Let him change it out and see if that fixes it.

  4. #4
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    that right there is why I stress to customers that they should get the 10 yr p&l you just paid for the warranty in service savings.
    You can't fix stupid

  5. #5
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,058

    Smile sounds more like;

    it is in the refrigerant circuit not the fan. Does it happen consistently in the a/m? Did tech run the fan without compressor to isolate the sound? Generally bearings in a motor will increase noise with run time, not go away especially as the ambient increases.Refrigerant pressures can cause the symptoms that you are seeing and as they begin to stabilize the sound will clear. Just a thought.

  6. #6
    Join Date
    May 2007
    Posts
    164
    Interesting thought Second Opinion... Tech did isolate sound by running just compressor without fan.... But not fan without compressor?

    Fan is supposed to be replaced in the a.m. so we'll see how it sounds this weekend as temps are supposed to be a cold 90F.

    Tech claimed pressures were good with disch press=220, suct=76, superheat=8, sub-cool=13, and ambient=89f.
    Quote Originally Posted by second opinion View Post
    it is in the refrigerant circuit not the fan. Does it happen consistently in the a/m? Did tech run the fan without compressor to isolate the sound? Generally bearings in a motor will increase noise with run time, not go away especially as the ambient increases.Refrigerant pressures can cause the symptoms that you are seeing and as they begin to stabilize the sound will clear. Just a thought.

  7. #7
    Join Date
    May 2007
    Posts
    164
    replacement of fan motor appears to have corrected harmonics problem.

    unfortunately, tech damaged fan blades which are now on order.

    suspect he must of really messed em up as another tech told me it's normally an easy fix to correct "bent" fan blades?

    fan blades were fine yesterday which tech confirmed as he did the work both days but did not explain what happened today?

  8. #8
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,306
    Quote Originally Posted by chandleraz_guy View Post
    replacement of fan motor appears to have corrected harmonics problem.

    unfortunately, tech damaged fan blades which are now on order.

    suspect he must of really messed em up as another tech told me it's normally an easy fix to correct "bent" fan blades?

    fan blades were fine yesterday which tech confirmed as he did the work both days but did not explain what happened today?
    If you have a swept wing blade that mite be a good thing. There have been harmonic problems in some cases with those blades.

  9. #9
    Join Date
    May 2007
    Posts
    164
    Second Opinion--I think you are onto something as high pitched noise is back after outside temp cooled. <I had been a little warmer>

    Fan motor replacement did not correct problem.

    Tech said all pressures looked good but split on unit is 2 degrees warmer than my other xl14i of some tonage and configuration?

    Any ideas?
    Quote Originally Posted by second opinion View Post
    it is in the refrigerant circuit not the fan. Does it happen consistently in the a/m? Did tech run the fan without compressor to isolate the sound? Generally bearings in a motor will increase noise with run time, not go away especially as the ambient increases.Refrigerant pressures can cause the symptoms that you are seeing and as they begin to stabilize the sound will clear. Just a thought.

  10. #10
    Join Date
    May 2007
    Posts
    164
    Another tech was onsite today and appears to have isolated harmonics to copper tubing on the side/center above the king valve. (from what I saw)

    Says he might try wrapping it with something?

    Also said something about a bur (sp?) possibly getting loose which is causing the noise in the cooper pipe?

    They are going to tackle issue later in the week but I wanted see if this made any sense or is this just another HACK but sound did go away when he pressed on the hot copper pipe...

  11. #11
    Join Date
    Jun 2007
    Location
    Round Rock
    Posts
    3,513
    It sounds like the dude is on top of it. Ease up and give him a chance. Nothing is perfect all the time brand new. Take into consideration the amount of units anybody makes. There is bound to be problems off and on. See if the guys who put it in will take care of it. If everything were perfect in this industry, all the time, then there wouldn't be this website.

  12. #12
    Join Date
    May 2007
    Posts
    164

    Problem Resolved - Hopefully!

    Local Trane office Super Tech ordered new copper discharge line going into the 4 way valve on my xl14i after isolating noise to it. New line was slightly larger and from the factory but nothing obvious was found inside old line.

    A burr/bead was suspect as causing the noise which would go away when gauges were connected and was only present during periods of no-load.

    All freon was removed and replace with new stuff as was drier. My Tech did not use nitro while making any of the welds but did pressure test with it and then did pull a deep vacuum.

    Problem seems to be gone and hopefully won't come back? Wonder what was really cause it and what the defect really was?

  13. #13
    Join Date
    Sep 2006
    Location
    Winter Springs, Fl
    Posts
    1,755
    I had a similar problem once.

    I was sent out to change a compressor on a fairly new goodman CU. My boss diagnosed the problem to the compresor making noise but it was running good. This unit is installed at his mother-in-laws house so it was kinda high on the priority list to get it solved. Anyway I guess he thought the valves were bad or it was fixing to go out. He tried putting vibration isolators under the unit to quiet it up before suspecting the compressor but of course it didn't work. I was a little suspect of the pump being bad when I got the call but I went to goodman and got a new pump anyway in case I was wrong. I went up to the unit with only a 5/16 nut driver and looked it over a bit. Listened to it and it really didn't sound like a pump going bad, just metal to metal rattling kinda. So I started pushing on the unit in different spots and found I could control the noise. Come to find out it was the discharge tube that was rubbing on the lower panel that is underneath the control box. When I removed the panel and restarted the unit the noise magically disappeared. I looked for witness marks on the panel, found the tube and adjusted it. Quick and simple. My boss was a little surprised at what the problem really was and maybe made him feel bad or embarrassed since it was a family members unit. Ohh well. I really wasn't in the mood to change a pump that day anyhow. Good thing it was easy.
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