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Old 10-10-2012, 12:49 PM   #16
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Rooftop unit Trane XL14C compressor vibration


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Originally Posted by joeyl View Post
Maybe I should be reinforcing the roof slats/trusses from the underside????
I think that is a great idea. Can you sister some 2X to the surrounding rafters? The longer the better.

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Old 10-10-2012, 01:13 PM   #17
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Rooftop unit Trane XL14C compressor vibration


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Originally Posted by Missouri Bound View Post
I think that is a great idea. Can you sister some 2X to the surrounding rafters? The longer the better.
So just nail 2X4 lengthwise to the existing rafters... Do you guys have pictures of this done in order to reinforce roof for RTU installs? Sorry I am a complete noob on framing

Or should I go with a 2X4 horizontal and span a few rafters to tie them together?

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Old 10-10-2012, 02:07 PM   #18
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Rooftop unit Trane XL14C compressor vibration


so your supply is ducted from the bottom of unit if the curb was cut from the size of the curb...most curbs are the air side of the units so when the unit is dropped that is the return and supply looking into the curb...there is the noise.how did they seperate the return from the supply.
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Old 10-10-2012, 03:09 PM   #19
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Rooftop unit Trane XL14C compressor vibration


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so your supply is ducted from the bottom of unit if the curb was cut from the size of the curb...most curbs are the air side of the units so when the unit is dropped that is the return and supply looking into the curb...there is the noise.how did they separate the return from the supply.

underneath the unit, inside the curb, there are 2 ducts attached to the supply and return openings of the unit with a piece of flex.


Here are some pictures underneath the roof, it was a nightmare of flex before. The new installers removed most of the flex that was not needed and replaced most with hard metal insulated ducts. They kept the flex for the return.

Supply and return plenum






Top line is flex return
bottom is metal duct to living room



Strapped metal duct to the back den

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Old 10-10-2012, 03:15 PM   #20
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Rooftop unit Trane XL14C compressor vibration


BINGO...if they screwed the duct work to the bottom of the unit without a flex collars then there is the connection.all the unit vibes and noise would of been muffled from collars and or connected to the insulated curbing with a seperation panel in the middle for air supplied and return
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Old 10-10-2012, 03:19 PM   #21
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Rooftop unit Trane XL14C compressor vibration


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Originally Posted by biggles View Post
BINGO...if they screwed the duct work to the bottom of the unit without a flex collars then there is the connection.all the unit vibes and noise would of been muffled from collars and or connected to the insulated curbing with a seperation panel in the middle for air supplied and return
I think there is a flex collar at the mount points of the return and supply. I'm not 100% sure because with the new plenum and insulation wrap I cannot see the underneath of the unit anymore but the new installer said he did I am also wondering: if you look at the pictures in the attic, there are vertical posts holding up the center beam of the room. I need to check to make sure but it seems like the vibration is more intense in the rooms beneath these posts.

Last edited by joeyl; 10-10-2012 at 03:21 PM.
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Old 10-10-2012, 04:26 PM   #22
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Rooftop unit Trane XL14C compressor vibration


put your ear up to that vertical and see what you hear feel...if your up on the roof and can access the return where the filter is might rech down into the your flex collar should be right below the unit

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Old 12-12-2014, 08:58 PM   #23
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Rooftop unit Trane XL14C compressor vibration


Joey, did you solve this trane rooftop vibration problem? I just had the same unit installed on my roof and have the same kind of vibration telegraphing into my bedroom. What did you end up doing?
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Old 12-13-2014, 03:07 AM   #24
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Rooftop unit Trane XL14C compressor vibration


Post some pics of how the unit is mounted and we'll go from there. I have found that although people claim scroll compressors to be quieter, I find they vibrate more than the old recip units and tend to transmit a little more noise down into the home.
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Old 12-13-2014, 04:02 AM   #25
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Rooftop unit Trane XL14C compressor vibration


start kit.

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