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Author Topic: vibration from air conditioner  (Read 4219 times)

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Jim Hardesty

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vibration from air conditioner
« on: June 13, 2012, 03:58:39 PM »

I just installed an air conditioner, an Ocean Breeze 16,000 btu.  The installation came out very well, everything but the duct work fits under the v-berth.  The problem.  When the compressor is running it vibrates the whole boat.  You can feel it (bare footed) standing on the cabin top.  The sound is a low drone, loudest in the head.  The AC unit is mounted on 3/4 plywood, sits on 1/8 rubber and 1/2 foam (antifatigue mat) and rubber bushings between the screw heads and the unit.
What can be done to isolate the AC unit?   Rubber mounts come to mind, but where to get them?
Jim
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Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
sailing Lake Erie
from Commodore Perry Yacht Club
Erie, PA

Steve McGill

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Re: vibration from air conditioner
« Reply #1 on: June 14, 2012, 04:25:34 AM »

Jim,

When I first read your post I thought I wrote it. I just installed a Flagship Marine 16.5K BTU unit in the same location as yourself. glassed in
a shelf and bolted the unit to it. I thought this weekend I would put down rubber between the unit and the shelf. It appears you have done that
with little success. I am trying to determine if rubber bushings at the attachment points bolted to the shelf will isolate the noise, not sure it that will provide sufficient support for the unit.

On eBay, searching under rubber bushings they offer rubber stock that you/we could cut to size or an automotive type rubber bushing may help.

As is often said here, there are not questions that have been asked before.

We can only hope for a positive response/s

Steve
« Last Edit: June 14, 2012, 04:47:50 AM by Steve McGill »
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CLARITY 1988 #588 TRWK
Chesapeake, Herring Bay, MD

Jim Hardesty

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Re: vibration from air conditioner
« Reply #2 on: June 22, 2012, 05:32:08 AM »

Here is what I did.  I had some half inch foam floor pads left from the pack bought from Big Lots for $12 for protecting the cabin sole during the AC instillation.  They looked like they would stop some vibration.  I carpet taped some under the vberth lid and laid some beside the hull.  I bought more.  At $12 I was generous, only making sure air flow was not affected and keeping them away from hot spots. 
It helped a lot.  The only noticeable noise and vibration is in the head and the vberth and it's not much.  Going to try it overnight and see, worst possibility is that I may have to move to the aft berth.
Took some pictures, but having trouble getting them here.  The floor pads are half inch foam about 3' * 3' with interlocking edges.  One side smooth one side sort of a diamond plate, I put the diamond plate side to the AC unit.
Still have some finishing work to do on the AC instlation, don't like the metal air return grill, and just prototyped a box for the AC vents in the vberth.  That will wait till end of season.  Perhaps replace some of the foam pads with engine sound proofing foam.  Always more to do.
Jim
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Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
sailing Lake Erie
from Commodore Perry Yacht Club
Erie, PA

Ken Juul

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Re: vibration from air conditioner
« Reply #3 on: June 23, 2012, 04:56:34 AM »

Mine vibrate....that's how I know they are working!  Jelly fish (nettles) and eel grass are a big problem in the Chesapeake.  I can tell from the change in noise level when the water strainer is getting plugged.  20+ years around jet engines and Rock and Roll, maybe my ears aren't as sensitive as yours.
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Ken & Vicki Juul
Luna Loca #1090
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lazybone

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Re: vibration from air conditioner
« Reply #4 on: June 23, 2012, 04:39:16 PM »

We have a rotary type compressor under our V-berth and have no problems.

My quess is that your unit is a piston type which is both noisier and prone to vibration.
« Last Edit: June 23, 2012, 04:39:44 PM by lazybone »
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S/V LAZYBONES  #677

Jim Hardesty

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Re: vibration from air conditioner
« Reply #5 on: July 01, 2012, 06:31:01 AM »

To improve and make permanent the sound proofing I'm considering
http://www.sailorssolutions.com/index.asp?page=ProductDetails&Item=SPM01
Has anyone used them?  To what success?
Jim
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Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
sailing Lake Erie
from Commodore Perry Yacht Club
Erie, PA

Ron Hill

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Re: vibration from air conditioner
« Reply #6 on: July 01, 2012, 05:48:05 PM »

Jim : I'm sure that the compresser itself has its own rubber bushings - are they all OK??

The next item to check is the platform the compressor unit sits on - is that touching the hull??
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Jim Hardesty

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Re: vibration from air conditioner
« Reply #7 on: July 03, 2012, 10:28:00 AM »

OK.  Yesterday I got to Joe, at Ocean Breeze, he thought that my compressor got out of balance during shipping.  Told me to loosen the 3 mounting screws at the compressor then re-tighten with the compressor running.  It helped, if it would have been this smooth and quiet at first perhaps I would have been satisfied.  Now I'm on a quest for quiet.  Going to buy the soundproofing tiles.
Jim
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Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
sailing Lake Erie
from Commodore Perry Yacht Club
Erie, PA

Roc

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Re: vibration from air conditioner
« Reply #8 on: July 08, 2012, 12:04:51 PM »

Doesn't the Flagship Marine unit have a rotary compressor, which should be quiet?
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Roc - "Sea Life" 2000 MKII #1477.  Rock Hall, MD

lazybone

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Re: vibration from air conditioner
« Reply #9 on: July 08, 2012, 03:45:22 PM »

Their site I think says they don't use "scroll" compressors which are very quiet.

 but I can't find any reference to what they do use.

If your really curious you could just look at the info-plaque on the compressor.

edit: Just look again and they use Emerson compressors.  They make Scroll type and reciprocating, no rotory.
« Last Edit: July 08, 2012, 04:41:21 PM by lazybone »
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S/V LAZYBONES  #677
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