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Old 08-10-13, 08:06 PM   #31
basjoos
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Quote:
Originally Posted by AC_Hacker View Post
I would repeat what has already been said about NOT mounting your outdoor unit to the house. One of the miracles of the mini split is how unobtrusive they are... so any noise that you hear from one will, over time, seem intolerable. The compressor in the mini split is variable frequency, so as it goes through it's various RPMs, any part of the structure of your house that is capable of being resonant with the compressor at that time, will resonate and create an intensified sound... in the long term, you will not be happy. So if you do build an elevated structure for your OD unit, don't even tie it to your house... resonance will be transmitted.
Finished installing my Mitsubishi heat pump 2 weeks ago and it has been running nicely ever since. The industrial rubber vibration isolation feet I installed on the outdoor unit are very effective and I can't hear or feel any vibration or resonance in the house even when standing inside the house next to the wall with the outdoor unit running 2 feet away on the other side of the wall.

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Old 08-10-13, 10:35 PM   #32
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Quote:
Originally Posted by basjoos View Post
Finished installing my Mitsubishi heat pump 2 weeks ago and it has been running nicely ever since. The rubber vibration isolation feet I installed on the outdoor unit are very effective and I can't hear or feel any vibration or resonance in the house even when standing inside the house next to the wall with the outdoor unit running 2 feet away on the other side of the wall.
If it's attached to the wall, there is a very good chance sound will conducted.
Almost everything made of solids has a resonance frequency.

There might be sound, but it's at a lower frequency and amplitude than you can hear.
However, you may be able to feel it..

Of course if the resonate freq of the wall, is higher or lower than the range
produced by the heat pump, there won't be a problem.

I've seen pictures of outdoor units mounted on brick walls.
Those might be safe from absorbing acoustic range vibrations.

The energy has to go someplace. Into the Rubber shocks (turned to heat)
or transmitted via air/as sound.
How much energy gets past the shocks, depends on what they are mounted on.
Is the shock mount sitting on a sound conductive medium?

Luckily, not a lot of vibration is emitted by the compressor.
But there is some. If you look at this pic, you can see about six
vibration dampener bags attached to the copper pipes.
The four on the right have brown packing tape around them.
These wrap-around bags contain a putty-like substance.
It absorbs vibrations, keeping the copper from being resonated too much.

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Old 08-11-13, 11:51 AM   #33
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Its mounted on a 4' x 6' plywood deck whose one side is bolted to the wall of the house and whose other side is supported by two 4x4 posts. The vibration isolators are rubber industrial units bought from McMaster-Carr and I can't hear any noise or feel any vibration in the house with the outside unit running wide open or ramping up or down.
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Old 08-11-13, 05:23 PM   #34
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Quote:
Originally Posted by basjoos View Post
Finished installing my Mitsubishi heat pump 2 weeks ago and it has been running nicely ever since. The industrial rubber vibration isolation feet I installed on the outdoor unit are very effective and I can't hear or feel any vibration or resonance in the house even when standing inside the house next to the wall with the outdoor unit running 2 feet away on the other side of the wall.
I'm glad the rubber insulation feet have worked well for you, and I hope you have no unwanted resonant vibrations.

I posted the message that you quoted because a personal friend of mine had installed an LG unit to an outside wall of his frame house, above head height. He is very thoughtful with his work and his craftsmanship is be best I have ever seen on anything he attempts. To be quite honest, I'm not sure if he used rubber vibration insulators or not. It would be odd for him to overlook such a thing. But his house is very quiet and the noise problem was not easily ignored.

Good that you found a solution.

-AC
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Old 09-28-13, 04:59 PM   #35
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"Might this just be an electrically-powered heat loss machine?"

That's the story of my house!!

I could make it better, but my wife wants to keep the windows!!
Windows are just holes in the wall for energy to flow through . :-(

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Old 09-29-13, 11:20 AM   #36
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Speaking of Hole-in-the-wall... There is an old 18k AC in my den wall that needs removal.

The problem is what to do with the 20x25 hole??
Wife don't like a complete seal-up idea. So, besides a window, what cool thing could I install in the hole and not be too lossy.?.

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Old 09-29-13, 01:03 PM   #37
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[QUOTE=Xringer;31975]Speaking of Hole-in-the-wall... There is an old 18k AC in my den wall that needs removal.

The problem is what to do with the 20x25 hole??
Wife don't like a complete seal-up idea. So, besides a window, what cool thing could I install in the hole and not be too lossy.?.

QUOTE]

Window with some kind of planter / flower box ?

Or some kind of whole house vent or fresh air fan , to use when the weather is nice outside ?

God bless
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Old 09-29-13, 04:43 PM   #38
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I was thinking about planter, but I fear it would be leaky and a security problem.
Busted Burgler - YouTube

The ventilation idea has also occurred to me.
And it would great to use in the summer. But it would have to be sealed
up good in the winter..

Maybe a small ERV?

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Old 09-29-13, 05:29 PM   #39
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I was thinking about planter, but I fear it would be leaky and a security problem.
Busted Burgler - YouTube

The ventilation idea has also occurred to me.
And it would great to use in the summer. But it would have to be sealed
up good in the winter..

Maybe a small ERV?


Energy Recovery Ventilator ?

I know just about nothing about them ?

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Old 09-29-13, 07:17 PM   #40
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Yeah, one of these would allow us to suck in some cold outdoor air,
and heat it up some, by stealing the heat out of the air we are pumping outdoors..
That diamond shaped box in the middle is an air-to-air heat exchanger..

Works the same way in the summer, but does the opposite. Cools off the incoming hot air.

It's a way of getting fresh air in your house, without wasting too much AC or heat..

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