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  1. #27
    Join Date
    Mar 2009
    Posts
    214
    OK, the tech came out and is going to put the condenser on isolators. I would like to run something by you guys. He states that the Trane heat pumps heat better and run at higher pressures and that the trade off is that I may just hear the compressor pumping through the lineset. He also thought that having the lineset secured to a stud in the wall could cause the problems. I thought have the lineset unsecure could cause these resonance issues. Comments?

  2. #28
    Join Date
    Mar 2009
    Posts
    214
    Is surging sound in the lineset normal and what are my chances that this will be dampened with isolators? I am not feeling too optimistic since most of the units in my development are mounted directly on pads, not pump ups or isolators.

  3. #29
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    2,193
    My experience with resonance has been that it is worse in heating than cooling.

    I had a new house that I told the HO to leave the holes open around where the lines went to the upstairs through the top and bottom plates in the wall. he went around and sealed all the holes for plumbing and electrical with expandafoam, including the hole with the lines. NO problem all summer, switched to heating and the noise started in the wall. He removed as much foam as he could which helped but he couldn't get to all of it.

    Vibration isolators in the lines don't seem to work {they are llike a braded hose soldered into the lines}. Something else to try is dampeners. Clamp a vise grip along the lines, you may have to try differents sizes. If you hit the right size at the right spot it can absorb the viration. It's a hit or miss, trial & error thing, and you may never find the right combo.

    As far as the other units at the complex, as I understand harmonics it comed down to "tuning" the lines. Vibrations carry at certain frequencies. If the line size, length & mounting match the frequency put out by the compressor or unit, you get noise. So the answer is to de-tune the line set. It works similar to tuning an arrow to the bow to get it to fly true.

    Hope this helps.

  4. #30
    Join Date
    Mar 2009
    Posts
    214
    The isolators that they are going to put on go under the HP it self. I am hoping that it will absorb some of the resonance, but not sure. Do you think that that may help at all? I do not hear the resonance in the attic, and outside the lines don't seem to vibrate too much, but there is some. Are you suggesting that I use the visegrip outside and or upstairs in the attic?
    I wanted the tech to shut the compressor off and just run the compressor fan, but he was not in the mood for that. That would atleast tell me if the fan was the problem and if I should try to move the unit further away.
    This thing really annoys me. If they cannot figure it out, I think I may have to request a trane field rep. If they knew for sure it was the lineset, I would not be opposed to opening the wall and padding it, that is how much I hate it.
    BTW, I thank everyone for their help. Please keep the ideas coming. I will try and do whatever you suggest. I cannot imagine that people are satisfied living with this drone.

  5. #31
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    2,193
    If you don't hear it outside the chance of it being fan related are slim.

    As far s the visegrips go, you just have to put them on any where you can get them and try it, if it doesn't help you move them down the line just a little, a 1/2" or so.

    Have you tried touching the wall where you hear it the most to feel for vibrations?

    I had one the first year I was in business that carried a hum into the door post on the Master bedroom. When we finally tracked it down it was from the liquid line being pressed by a heavy electrical wire against the basement ceiling sheetrock. The sound carried through the framing to the door post 14' away.

    Sound can be so fun.

  6. #32
    Join Date
    Mar 2009
    Posts
    214
    Yeah, I can see where it is a pain in the butt. The rubber isolators under the HP does not seem to have helped. I can hear and feel a very light vibration in the wall right where the lineset goes. The pulsing drone is loudest right there.
    I am on the second floor of this condo. I imagine my HVAC lineset goes in my neighbors wall and then up through mine. I am afraid to ask what it sounds like down there, but I guess I have to ask.
    I would consider removing some sheetrock to get to the line set if necessary. I also have an inspection camera that I think I may shove in the wall. The telephone line outlet is right there in the wall as well and maybe the lines are in that same pocket. I will have to seen where the stud is.
    I am getting the impression that the lineset should NOT make contact with the framing and should be padded. I know in the attic, the line set is zip tied to the framing. The larger line has padding around it. But the smaller line, is the one with the pulsing and it is not covered.

  7. #33
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    2,193
    I assuem that the lines go up the outside wall. It is quite possible that the lines were loose when they were installed but when the wall was insulated the insulation pushed the lines tight to the stud, sheetrock, etc. That being said it may or may not be noisy in the lower appartment. It may be at a frequency that they may not hear easily. The place I reffered to earlier, it drove him nuts, she never really noticed it unless she really stopped to listen for it.

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